Note 3: The minimum distances relative to fuel-fired appliances shall be as required by ANSI Z223.1/NFPA 54 for fuel gas burning appliances and equipment, NFPA 31 for oil burning appliances and equipment, and NFPA 211 for other combustion appliances and equipment. These include the ACGIH Industrial Ventilation Manual and the ASHRAE Handbook-HVAC Applications, ASHRAE Laboratory Design Guide, and NSF/ANSI 49. Informative Appendix J contains sources of additional information on separation criteria. A laboratory fume hood exhaust air outlet shall comply with ANSI/AIHA Z9.5. Note 2: Does not apply to laboratory fume hood exhaust air outlets. Note 1: Applies to the distance from the outdoor air intakes for one ventilation system to the exhaust/relief outlets for any other ventilation system. Roof, landscaped grade, or other surface directly below intake (note 5). Truck loading area or dock, bus parking/idling area (note 4).ĭriveway, street, or parking place (note 4). Garage entry, automobile loading area, or drive-in queue (note 4). Vents, chimneys, and flues from combustion appliances and equipment (note 3). Plumbing vents that terminate more than three feet above the level of the outdoor air intake. Plumbing vents that terminate less than three feet above the level of the outdoor air intake. Table 402.3.1 Air Intake Minimum Separation Distance (2016 ASHRAE 62.1: Table 5.5.1) ObjectĬlass 2 air exhaust/relief outlet (note 1): air with moderate contamination concentrations, mild sensory irritation, or mildly offense odors and includes air that is inappropriate for transfer or recirculation to spaces used for different purposes.Ĭlass 3 air exhaust/relief outlet (note 1): air with significant contamination concentration, significant sensory- irritation intensity, or offensive odor.Ĭlass 4 air exhaust/relief outlet (note 2): air with highly objectionable fumes or gases, or with potentially dangerous particles, bio aerosols, or gases, at concentrations high enough to be considered harmful. An intake opening shall be located a minimum of 10 feet horizontally from the centerline of an alley.An intake opening on a structure located within a flood hazard area shall be at or above elevation required by Section 1612 of the Building Code for utilities and attendant equipment and. An intake opening shall be located at least three feet (914 mm) below contaminant sources or as set forth in Table 402.3.1 when the sources are located within 10 feet (3,048 mm) of the opening.An outdoor air intake opening shall be located within 10 feet (3,048 mm), measured horizontally, from streets, alleys, parking lots, and loading docks if the openings are located at least 25 feet (7,620 mm) vertically above those locations.Except as provided below or in Table 402.3.1, a mechanical or gravity outdoor air intake shall be located at least 10 feet (3,048 mm), measured horizontally, from any hazardous or noxious contaminant source, including vents, streets, alleys, parking lots and loading docks.Shall be located at least 10 feet (3,048 mm) from lot lines or buildings on the same lot.General manufacturing (excludes heavy industrial and processes using chemicals)Īn air intake opening shall comply with Table 402.3.1 and Occupiable storage rooms for dry materialsįreezer and refrigerated spaces (<50☏) e Occupiable storage rooms for liquids or gels b TABLE 402.1 MINIMUM VENTILATION RATES IN BREATHING ZONE 1, 2 OCCUPANCY CATEGORY 4ĭEFAULT OCCUPANT DENSITY 3 (people/1000 ft 2)
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