Washington Administrative Code › Title 51 - Enterprise Services, Department of (Building Code Council) › Chapter 51-52 - State Building Code adoption and amendment of the 2021 edition of the International Mechanical Code › Section 51-52-0501 - Section 501-General

Current through Register Vol. 24-14, July 15, 2024
501.3.1
Location
			 of exhaust outlets.
The termination point of exhaust outlets and ducts
			 discharging to the outdoors shall be located with the following minimum
			 distances:
1.
For ducts conveying
			 explosive or flammable vapors, fumes or dusts:
30 feet (9144 mm) from
			 the property line; 10 feet (3048 mm) from operable openings into the building;
			 6 feet (1829 mm) from exterior walls and roofs; 30 feet (9144 mm) from
			 combustible walls and operable openings into the building which are in the
			 direction of the exhaust discharge; 10 feet (3048 mm) above adjoining
			 grade.
2.
For other
			 product-conveying outlets:
10 feet (3048 mm) from property lines; 3 feet
			 (914 mm) from exterior walls and roofs; 10 feet (3048 mm) from operable
			 openings into the building; 10 feet (3048 mm) above adjoining grade.
3.
For environmental air exhaust other
			 than enclosed parking garage and transformer vault exhaust:
3 feet (914
			 mm) from property lines, 3 feet (914 mm) from operable openings into buildings
			 for all occupancies other that Group U, and 10 feet (3048 mm) from mechanical
			 air intakes. Such exhaust shall not be considered hazardous or noxious.
			 Separation is not required between intake air openings and living space
exhaust air
openings of an individual
dwelling
			 unit
or
sleeping unit
where an approved factory-built
			 intake/exhaust combination termination fitting is used to separate the air
			 streams in accordance with the manufacturer's instructions.
EXCEPTIONS:
1. The separation between an air intake and exhaust
						  outlet on a single listed package HVAC unit.
2. Exhaust from environmental air systems other than
						  garages may be discharged into an open parking garage.
3. Except for Group I occupancies, where ventilation
						  system design circumstances require building HVAC air to be relieved, such as
						  during economizer operation, such air may be relieved into an open or enclosed
						  parking garage within the same building.
4.
			 Exhaust outlets serving structures in flood hazard areas shall be installed at
			 or above the elevation required by Section 1612 of the
International
			 Building Code
for utilities and attendant equipment.
5. For enclosed parking garage exhaust system
			 outlets and transformer vault exhaust system outlets: 10 feet (3048 mm) from
			 property lines which separate one lot from another; 10 feet (3048 mm) from
			 operable openings into buildings; 3 feet (914 mm) horizontally from, 10 feet
			 above, or 10 feet below adjoining finished walkways.
6. For transformer vault exhaust system
			 outlets, subject to the requirements of NFPA 70 Section 450.45: Ten feet (3048
			 mm) from fire escapes, required means of egress at the exterior of the
			 building, elements of exit discharge, exterior combustible materials, and
			 openings that are not protected in accordance with Section 705.8 of the
International Building Code
; 10 feet (3048 mm) from property
			 lines which separate one lot from another; 10 feet (3048 mm) from operable
			 openings into buildings; 10 feet (3048 mm) above walkways.
7. For elevator machinery rooms in enclosed
			 or open parking garages: Exhaust outlets may discharge air directly into the
			 parking garage.
8. For specific
			 systems see the following sections:
8.1.
			 Clothes dryer exhaust, Section 504.4.
8.2. Kitchen hoods and other kitchen exhaust
			 equipment, Sections 506.3.13, 506.4 and 506.5.
8.3. Dust stock and refuse conveying systems,
			 Section 511.2.
8.4. Subslab soil
			 exhaust systems, Section 512.4.
8.5. Smoke control systems, Section
			 513.10.3.
8.6. Refrigerant
			 discharge, Section 1105.7.
8.7.
			 Machinery room discharge, Section 1105.6.1.