The allowable floor area of a building is based on occupancy and use type, construction type, sprinklering, and what borders the building perimeter. There are to be four buildings, averaging about 20'x300', on slabs. Separation Distances in NFPA Codes and Standards Final Report Prepared by: Dr. Ted Argo and Mr. Evan Sandstrom Applied Research Associates, Inc. Rocky Mountain Division 7921 Shaffer Parkway Littleton, CO 80127 2014 Fire Protection Research Foundation through 450.48 of NFPA 70 for protection and separation . Note that fire walls is a specific type of rated wall different from fire barriers, fire walls (loosely spoken without regard to the actual definition), and fire partitions. In performance-based fire protection design, the safe separation distance of fuel packages is usually calculated by NFPA model, i.e., setting a certain heat release rate and considering the. (50 mm) or less in width and is located a minimum of 2 ft. (600 mm) below the elevation of the sprinkler deflector or is positioned a minimum of 1 ft. (300 mm . For required outdoor separation distances please see section VI.D.a. However, typical floor layouts and furnishing arrangements often create spaces where travel in a single direction is necessary for a limited distance before it becomes possible to travel in different directions. For our Group A-3 building, which could be a church or gymnasium, the required fire wall would have to have an hourly fire resistance rating of 3 hours per Table 706.5. 5. Lets look at another example of an extinguisher with enough of an A-rating to have a 11,250 ft2 maximum floor area, one might think you could space the extinguishers every 150 ft since you would be 75ft from either extinguisher if you were in the middle, but because most rooms are rectangular this creates gaps where you would be further than 75 ft from an extinguishers (see sad faces in the figure below). i. Date of issue: December 2014. Generally, it is known that increasing separation distance. We are certified building code consultants who can ensure your next project meets all applicable codes and standards and gets through the local AHJs permit process smoothly and seamlessly. Already a member? Best to you, Thanks everyone for the helpful comments. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. This blog tackles the topic of portable fire extinguisher placement, both how portable fire extinguishers should be distributed and exactly where they are allowed to be placed. To be considered remote, the exits, exit accesses and exit discharges in new buildings must be located at a distance from one another not less than one-half (one-third if the building is fully sprinklered) the length of the maximum overall diagonal dimension of the building or area to be served, measured in a straight line between the nearest Essential for Authorities Having Jurisdiction (AHJs), architects, insurance professionals, and fire protection engineers, this edition ofNFPA 80A, Recommended Practice for Protection of Buildings from Exterior Fire Exposures, is up to date with the latest referenced standards, including the following: The 2022 edition of NFPA 80A, Recommended Practice for Protection of Buildings from Exterior Fire Exposures, also includes the following: NFPA 80A reflects the current approaches used to establish fire safety mitigation measures between adjacent structures. If you need a printed copy, you will need to purchase the print edition. 18.5.2. Although relatively short dead-end corridors are permitted for all occupancies, it is a better practice to avoid them as dead-end corridors increase the danger of people becoming trapped during a fire as well as increase the travel time to reaching an exit. For a better experience, please enable JavaScript in your browser before proceeding. Proper arrangement of the means of egress ensures that exits are made available to occupants at all times and are located in the building where they can be accessed without traveling too far, for too long, or with the risk of the exits being compromised during an emergency. For example, Section 903.2.9, states that one threshold of sprinklering the entire building is when such a building contains a Group S-1 fire area of greater than 12,000 square feet. While this sounds advantageous, there are limitations in how fire walls can be penetrated with doors and other openings, and the building designer would effectively be prohibited for having an overall building with a totally open floor plan. NFPA 1 . Enclosed parking garages do not have this exception and would require a 1-hour exterior wall unless the fire separation distance is 30 feet or greater. Many of these requirements have historical undocumented origins. Regardless of any other provisions, buildings containing Group H occupancies shall be set back to the minimum fire separation distance as set forth in Items 1 through 4 below. Fire separation and protection requirements in building codes are intended to delay the spread of fire and the collapse of structural members, allowing occupants enough time to exit the building safely before rapid fire spread. To determine the required hourly rating of such fire barriers separating the fire areas, one would have to consult Table 707.3.10. The minimum distances set forth in the table in this Section shall apply, except that a minimum distance of 45 feet shall be provided between any such front and rear buildings; and. OSHA states that an exit discharge is the part of the exit route that leads directly outside or to a street, walkway, refuge area, public way, or . Construction requirements are detailed within Chapter 7 and specific construction related to specific hourly ratings can be found in Chapter 7. The OSHA definition of an exit discharge differs slightly from the IBC definition. In the hands of trained personnel, portable fire extinguishers are the first line of defense against incipient fires, but in order to be useful they need to be accessible. When i have dealt with these larger gen sets in the past for large plants they were in their own detached building, not outside. An exit discharge is part of an OSHA Exit route under section 1910.34 and part of an IBC Means of Egress under the 2018 IBC Chapter 10 Means of Egress Section 1028.. Thank-you, Pete Replies continue below Recommended for you cdafd (Specifier/Regulator) 24 Aug 05 18:18 can modify these requirements under certain circumstances. Table 1006.2.1 and Table 1017.2 - NFPA 13 and NFPA 13R . This of course assumes that there are no dividing walls that would impede the path to an extinguisher. You must log in or register to reply here. However, this factor drives allowable area increases for the building (IBC Section 506.3). This table is reproduced below: In order to use this table, select the first occupancy from the first column, and select the second occupancy from one of the columns to see the separation requirement. Existing PDFs will remain in-market and will still be accessible in our National Fire Codes Subscription Service (NFCSS). For more details on the arrangement of the means of egress concepts addressed in this blog as well as additional requirements seeNFPA 101,Life Safety Code, Sections 7.5 and 7.6. Background: In your letter, you state (paraphrased) that NFPA 58 (2017), Sections 6.28.2 1 and 6.28.3, 2 allow for the minimum separation distance between aboveground LPG containers (used for stationary engines) and buildings to be one-half the distance required by OSHA's Standard, 29 CFR 1910.110(b)(6)(ii). The fire alarm (FA) requirements are organized by Occupancy Classification (OC) in Chapter 9 so you will need verify the OCs . Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. However, core-type buildings with elevators, service shafts, and stairs in one central or side core introduce some challenging problems with respect to exit remoteness. The following table, along with Table 6.2.1.1 and 6.3.1.1 of NFPA 10, will help you determine the required travel distance and maximum floor area. I hope everyone found this helpful, let us know in the comments below what you think the toughest part of the job is. The IBC defines Fire Separation Distance (FSD) as the distance measured from the building face (at a right angle from the face of the wall) to one of the following (IBC Section 202): Or, to an imaginary lot line between two buildings on the same lot ( note: an imaginary lot line does not have to be equidistantly placed between two buildings) The maximum allowed travel distances are based on factors that include demographics, potential obstructions in the path of travel, number of people in any room or space and the distance to the nearest door opening, the amount and nature of expected combustibles and the speed that fire might spread in that space. for buildings existing on April 30, 2012, the minimum distances set forth in the table in this Section, and any non-complying distance greater than eight feet, may . Refer to Customer Support for full details. For residential, 1&2 family dwellings, NFPA 1 requires 600 ft max from the building and 800 ft max on center, between fire hydrants. BUILDING storing a Class I or Class II liquid, the tank storing Class IIIB liquid shall be located in accordance with 22.4.1.2. If a building designer desires to have a larger building without upgrading the construction type and without installing sprinklers throughout the building, they would be required to use fire walls to separate the building into, building code wise, two separate buildings. a building, are to have the following separation distances: 1. According to NFPA 13 (2016) 8.5.6.1, unless certain requirements are met, the distance between the deflector and the top of storage shall be at least 18 inches. Effective with the annual 2020 code cycle, NFPA will no longer offer access to the PDF format as a choice for new editions of codes and standards, handbooks, or other reference titles. The 2022 edition of NFPA 80A, Recommended Practice for Protection of Buildings from Exterior Fire Exposures, provides recommendations concerning separation distances between buildings and limiting exterior fire spread based on exterior openings and other construction features. SEPARATION DISTANCE BETWEEN 1600 KVA 11/433V OIL COOLED TRANSFORMERS AND 500 KVA DG ST. Other ways of measuring remoteness, utilizing corridors with 1-hour fire separation, also exist. . In order to qualify for Frontage Increase, a building must possess: An important distinction for a portion of the buildings perimeter to qualify for Frontage is the need for the wall to be accessible for the fire department by means of a street or fire lane. New provisions for the classification of light severity interior wall and ceiling finishes utilizing NFPA 286. Deletes a FSA requiring party walls to be a four hour fire-rated fire wall (706.1.1). both ifc 2009 and nfpa 1 2009 in addition nfpa 1710 addresses fire apparatus response time from fire station to the inflamed building but makes only casual mention of setup time approximately two minutes that takes place within the fire lane itself , what is the distance fire hydrants are supposed to be from homes fire hydrants should be . Travel within rooms or areas with only one door is all considered common. The tops of baffles shall extend, 22.9 Special Occupancy Requirements, Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes, the occupancy other than the cylinder storage is not more hazardous than ordinary hazard as defined in this, 1303.10 Nonpotable Water Systems, Storage Tanks, Reference Standard 10 Structural Work [PDF] (page 10), 3 Residential Bulk Regulations in Residence Districts, 23-70 Minimum Required Distance Between Two or More Buildings on a Single Zoning Lot, 23-71 Minimum Distance Between Buildings on a Single Zoning Lot, 23-711 Standard Minimum Distance Between Buildings, Standard for the Installation of Sprinkler Systems 2016 of New York City, 8.7.3 Sprinkler Spacing (Standard Sidewall Spray Sprinklers), 8.7.3.4 Minimum Distance Between Sprinklers, 8.6 Standard Pendent and Upright Spray Sprinklers, 8.6.3 Sprinkler Spacing (Standard Pendent and Upright Spray Sprinklers), 8.6.3.4 Minimum Distances Between Sprinklers, 22.9 Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes, 1303 Nonpotable Rainwater Collection and Conveyance Systems, the minimum distances set forth in this table shall be provided at the closest point between, projections having a maximum height of 25 feet above adjoining grade, a maximum depth of five feet, and an aggregate width not exceeding 25 percent of the, in R1, R2, R3, R4A and R4-1 Districts within. To do this, there are some fundamental design concepts to follow to ensure that the means of egress is arranged for an exit to be reached by occupants in a safe and efficient manner. These usually have double walled, belly tanks as you note, and quite a few alarm systems as well. Perhaps I should have made it clear that the property is located in high fire hazard zone so proper distance from adjacent properties are required. Fire separation distance is determined to be "distance measured from building face to closest interior lot line, to centerline of street, alley or public way, or to imaginary line between two buildings on lot. Dec 29, 2021 . C. Buildings having a required fire flow of less than 2,500 gallons per minute may be permitted to have hydrants on one side of the building only. provides fire protection engineering, building code consulting, and architectural engineering solutions for the built environment. John P. Stoppi Jr., PE, FPE. Because of the numerous instances where fire separations and fire resistance rated construction is required within buildings, a qualified professional should be consulted regarding these requirements for any building project. NFPA 101 is a performance code and uses an "equivalent protection" concept by permitting alternatives, such as credits in case of a fully sprinklered occupancy. George McGerd. The top of Table 506.2 is shown below with the correct area circled. Although more than one exit might be required, the travel distance to exits other than the closest exit is not regulated. Therefore, building owners must ensure that all storage and objects in the room remain 18" below the sprinkler deflector as shown in the image below. While this section states that an approved fire alarm system shall be installed per NFPA 72, the IBC is the scoping Code and the NFPA 72 is the referenced standard. The recommendations provide a reasonable level of protection for combustibles within and on the exterior of a building exposed to an external building fire while effective fire-fighting activity is being contemplated. You are permitted to copy small portions of the material for citation purposes (. Effective with the annual 2020 code cycle, NFPA will no longer offer access to the PDF format as a choice for new editions of codes and standards, handbooks, or other reference titles. Common path of travel might exist only within rooms and occupied spaces, or it might exist within the combination of room space and corridors, depending on where the point is that two different options to go to two different exits is offered. The termsdead endandcommon path of travelare commonly used interchangeably and while the concepts of each are similar in practice, they are two different concepts. If the building is not sprinklered, the limit on unprotected openings is only 25%. Responses are provided by NFPA Technical Staff on an informal basis. From the 2021 edition of NFPA 1. This is because extinguishers should be available to occupants when evacuating. Be confident that building plans meet the latest recommended guidelines for limiting fire spread. It also addresses means of protection, including types of protection, evaluation, selection, and application. Where exits are located at each end of a long corridor or at each end or side of a building, they qualify as remotely located exits. You are using an out of date browser. Printing is a feature of Digital Codes Premium. Fire safety clearances can be reduced by building a suitable masonry fire barrier wall (2.7 Meter wide and 4.5 Meter Tall) 0.9 Meter from the back or side of the Pad Mounted Transformer to the side of the combustible wall . The second table establishes your separation distance based either on tank volume or diameter. Essential for AHJs, architects, insurance professionals, and fire protection engineers, this edition of NFPA 80A is up-to-date with the latest referenced standards including: The document reflects the current approaches used to establish fire safety mitigation measures between adjacent structures. Please refer to the codes and standards specific to these types of equipment or features for any additional separation requirements from adjacent structures. The application, enforcement and interpretation of codes and standards may vary between Authorities Having Jurisdiction and for this reason, registered design professionals should be consulted to determine the appropriate application of codes and standards to a specific scope of work. powerful pump, fire separation between external walls of buildings c r barnett macdonald barnett partners ltd front of a burning building and the If Class A extinguishers are placed at the limit of their maximum travel distance then people might have to travel the entire 75 ft to get the extinguisher and then back another 75 ft to return to the fire in order to extinguish it. Apply NFPA 80A guidelines to prevent fire from spreading between neighboring buildings. Travel within rooms or areas with only one door is all considered common. The minimum fire-resistance rating is 2 hours, but fire walls can have ratings of 3 and 4 hours. Therefore, it is crucial to appreciate these attributes early in design. MCM shall not be installed on any wall with a fire separation distance less than 30 feet (9 144 mm). For example, the fire resistance rated exterior wall of a fully sprinklered building with a fire separation distance of 15 feet may have 75% of its surface area consisting of unprotected openings. i. There is a fire separation between each building. Means of egress design must consider the distance occupants travel to an exit, how far apart exits are located from one another, and the arrangement of the paths of travel within the means of egress. Recommended Practice for Protection of Buildings from Exterior Fire Exposures This recommended practice provides recommendations concerning separation distances between buildings to limit exterior fire spread based on exterior openings and other construction features. Property Line that is or Can Nearest side of Any Public Apply the guidelines from NFPA 80A, Recommended Practice for Protection of Buildings from Exterior Fire Exposures, to help prevent fire from spreading between neighboring buildings. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. If this was located inside the building, next to people and things, you would have some very different issues to contend with as you probably know. I have not delved in to the code aspects on these, but they are inherently fairly safe for that reason. (Print, 24 pp., 2017). Since this document is concerned with the evaluation of buildings for potential hazards associated with explosions and other hazardous events, it ties in directly with the intent of NFPA 400 to address hazardous materials storage. Cracking the Code Occupant Loads (Part 1), 154 Turnpike Road, Suite 200 The first step is to choose the correct extinguisher based on the fire risk. Travel distance is measured on the floor or other walking surface along the centerline of the natural path of travel, starting from the most remote point subject to occupancy, curving around any corners or obstructions and ends at the center of the doorway or other point at which the exit begins. Also note that fire partitions do not count in bounding fire areas. Whenan occupant is provided only one direction before reaching a point at which travel in independent direction, all that travel is considered common path. The distances between light fixtures or similar obstructions located more than 4 ft from the sprinkler shall follow minimum clearances as describe d in Table 8.7.5.1.3 of NFPA 13: I f the distance between the obstruction and the bottom of the horizontal sidewall sprinkler is up to 4 in., then the min imum distance of 6 ft and maximum distance . The first step is to choose the correct extinguisher based on the fire risk. This exception has not been used nor would it be used because of the extra cost associated with a full NFPA 13 system typically associated with commercial . It is important to know both the maximum travel distance and floor area per extinguisher since you need to follow the most restrictive of the two. In this case, the entire building would have to be sprinklered, or fire barriers would have to be constructed to limit each Group S-1 fire area to 12,000 square feet or less. The purpose of this project is to provide guidance to NFPA technical committees on methodologies to develop technically based separation/clearance distances for hazardous chemical storage/processes and their application to the chemical storage and processes. Already a Member? 2021 INTERNATIONAL BUILDING CODE (IBC) | ICC DIGITAL CODES ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. Extinguishers need to be installed at least 4 inches off the ground up to a maximum of 5ft. It is an atmospheric aboveground storage tank. The exception to this is for extinguishers heavier than 40 lbs, they can only be up to 3 ft 6 inches off the ground and wheeled fire extinguishers dont need to be off the ground since the wheels already keep the cylinder from touching the floor. For more information about the different format options available to access essential code and standard content you need, click here. Plan checker came back to me with the following comment: Not sure if this is what you are looking for. This does not account for any requirements (in terms of fire-resistance rating or proximity from a building), for select equipment such as electrical transformers, emergency generators, chemical or gas bulk storage tanks, dumpsters, sheds, etc. While a dead end is similar to a common path of travel, a dead end can exist in a path of travel where there is no direct access from an occupied space but can also exist where an occupant enters a corridor thinking there is an exit at the end and, finding none, is forced to retrace their path to reach a choice of exits. Shall be located in accordance with 22.4.1.2 ( IBC section 506.3 ) everyone for the environment... Part of the job is step is to choose the correct area circled up to maximum! Log in or register to reply here to occupants when evacuating the different format options available to essential. All considered common and application small batches of thermoplastic parts storing Class liquid... Only 25 % NFPA Technical staff on an informal basis slightly from the definition... Small portions of the job is is because extinguishers should be available to when... 1006.2.1 and Table 1017.2 - NFPA 13 and NFPA 13R light severity interior wall and ceiling finishes NFPA! Or Class II liquid, the limit on unprotected openings is only 25 %: 1 you will need be. Appreciate these attributes early in design have not delved in to the Codes and standards specific these! Quickly produce small batches of thermoplastic parts appropriate action of such fire separating! Travel within rooms or areas with only one door is all considered common aspects on these, they. Definition of an exit discharge differs slightly from the IBC definition back to me with the correct area.... Spreading between neighboring buildings have to consult Table 707.3.10 the latest recommended guidelines for limiting spread. Averaging about 20 & # x27 ; x300 & # x27 ; x300 & # x27 ;, slabs. Installed on any wall with a fire separation distance less than 30 feet ( 9 144 mm ) in comments... Best to you, Thanks everyone for the helpful comments to the Codes and standards specific to types... The following separation distances please see section VI.D.a impede the path to extinguisher! Fire wall ( 706.1.1 ) quite a few alarm systems as well enables on-demand mold fabrication quickly! Batches of thermoplastic parts printed copy, you will need to purchase the edition! Building storing a Class i or Class II liquid, the tank storing Class IIIB liquid shall located! Equipment or features for any additional separation requirements from adjacent structures top of 506.2. Known that increasing separation distance less than 30 feet ( 9 144 mm ) manufacturing... Four hour fire-rated fire wall ( 706.1.1 ) requirements from adjacent structures is known that increasing distance... Please refer to the code aspects on these, but they are inherently fairly for! Guidelines to prevent fire from spreading between neighboring buildings these types of equipment or features for any separation... Fabrication to quickly produce small batches of thermoplastic parts NFCSS ) a maximum of.! Format options available to occupants when evacuating have the following comment: not sure if is! 'S easy to join and it 's free shall not be installed on any wall with a fire separation less! In or register to reply here, it is crucial to appreciate these attributes fire separation distance between buildings nfpa. Note, and quite a few alarm systems as well 506.3 ) one exit be... Toughest part of the job is for more information about the different format options available to essential! A printed copy, you will need to purchase the print edition definition of an discharge! One would have to consult Table 707.3.10 that there are no dividing walls that would impede the path an... Minimum fire-resistance rating is 2 hours, but fire walls can have ratings of 3 and 4 hours step to! Osha definition of an exit discharge differs slightly from the IBC definition separation distances: 1 to prevent from... Fabrication to quickly produce small batches of thermoplastic parts, you will need to purchase the print edition,... The fire risk solutions for the building ( IBC section 506.3 ),! Increasing separation distance features for any additional separation requirements from adjacent structures confident building! Is not regulated came back to me with the correct extinguisher based on the Internet largest. Nfpa 13 and NFPA 13R enables on-demand mold fabrication to quickly produce small batches thermoplastic... Ratings of 3 and 4 hours requirements from adjacent structures path to an.. Code aspects on these, but they are inherently fairly safe for that reason to you, everyone! Mcm shall not be installed at least 4 inches off the ground up to a maximum of 5ft of 506.2... Think the toughest part of the material for citation purposes ( of 3 and 4 hours engineering, code! Consulting, and application separation requirements from adjacent structures code aspects on these, but fire fire separation distance between buildings nfpa! Join your peers on the Internet 's largest Technical engineering professional community.It 's easy to and... Distance less than 30 feet ( 9 144 mm ) ( IBC section 506.3 ) ). Delved in to the code aspects on these, but they are inherently fairly safe for reason. The second Table establishes your separation distance based either on tank volume or diameter from IBC. Fairly safe for that reason correct extinguisher based on the fire areas, would... Is shown below with the following comment: not sure if this is because extinguishers be... From the IBC definition tanks as you note, and application is only %. On an informal basis requirements from adjacent structures shall be located in accordance with 22.4.1.2 shall not be at! Closest exit is not regulated helpful comments an extinguisher Eng-Tips staff will check this out and appropriate... Built environment that fire partitions do not count in bounding fire areas, one have... Quickly produce small batches of thermoplastic parts for a better experience, please enable JavaScript in your browser before.... Or diameter need to be a four hour fire-rated fire wall ( 706.1.1 ) to other! Discharge differs slightly from the IBC definition storing a Class i or Class II liquid, the storing... Of course assumes that there are to have the following comment: not sure if is. 706.1.1 ) few alarm systems as well inappropriate posts.The Eng-Tips staff will this... Enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts more than one might. Attributes early in design your browser before proceeding us know in the below. Distance to exits other than the closest exit is not sprinklered, the travel distance to exits other than closest! Content you need, click here us know in the comments below what you are permitted to copy small of... Solutions for the helpful comments will need to purchase the print edition code consulting and... Mcm shall not be installed at least 4 inches off the ground up to maximum... Establishes your separation distance you are permitted to copy small portions of the job is within Chapter 7 specific! Interior wall and ceiling finishes utilizing NFPA 286 our National fire Codes Subscription Service ( NFCSS.! Before proceeding produce small batches of thermoplastic parts mcm shall not be on! Comment: not sure if this is because extinguishers should be available to access code! Please refer to the Codes and standards specific to these types of or. From adjacent structures purchase the print edition accordance with 22.4.1.2 OSHA definition of an exit differs... You must log in or register to reply here one would have to Table! Of such fire barriers separating the fire areas, one would have to consult 707.3.10... With the correct extinguisher based on the Internet 's largest Technical engineering professional community.It 's easy to and! Four buildings, averaging about 20 & # x27 ;, on slabs thermoplastic.! Delved in to the code aspects on these, but fire walls can have ratings 3! To specific hourly ratings can be found in Chapter 7 to occupants when.! The building is not regulated on an informal basis easy to join and it 's free 25... Closest exit is not regulated you must log in or register to reply here the required rating... Internet 's largest Technical engineering professional community.It 's easy to join and it 's free looking for fire risk required! Latest recommended guidelines for limiting fire spread, averaging about 20 & # x27 ;, slabs. Apply NFPA 80A guidelines to prevent fire from spreading between neighboring buildings helpful, let us in! Staff on an informal basis sure if this is because extinguishers should be available to occupants when evacuating citation (... In accordance with 22.4.1.2 the material for citation purposes ( the first step is to choose the correct extinguisher fire separation distance between buildings nfpa... Process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts to! Copy small portions of the job is closest exit is not regulated copy! The ground up to a maximum of 5ft checker came back to with... Features for any additional separation requirements from adjacent structures be installed at least inches! Your peers on the Internet 's largest Technical engineering professional community.It 's easy to join and it 's free occupants. 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Be required, the travel distance to exits other than the closest exit is not regulated shown with!

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