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 51-52-0202 - Section 202-General definitions

Current through Register Vol. 24-14, July 15, 2024
BALANCED WHOLE HOUSE VENTILATION.
Any combination
				of concurrently operating residential dwelling or sleeping unit mechanical
				exhaust and mechanical supply whereby the total mechanical exhaust airflow rate
				is within 10 percent or 5 cfm, whichever is greater, of the total mechanical
				supply airflow rate.
NOT BALANCED WHOLE HOUSE VENTILATION.
A whole
				house ventilation system serving a dwelling or sleeping unit that is not
				considered balanced in accordance with the definition in this code for
balanced whole house ventilation system
. Only other than Group
				R-2 dwelling and sleeping units are allowed in accordance with Section
				403.4.4.1 to have
not balanced whole house ventilation
				systems
.
DISTRIBUTED WHOLE HOUSE VENTILATION.
A whole house
				ventilation system shall be considered distributed when it supplies outdoor air
				directly (not transfer air) to each dwelling or sleeping unit habitable space,
				(living room, den, office,
interior adjacent room
, interior
				adjoining spaces or bedroom), and exhausts air from all kitchens and bathrooms
				directly outside.
NOT DISTRIBUTED WHOLE HOUSE VENTILATION.
A whole
				house ventilation system shall be considered not distributed when either the
				supply system or the exhaust system is not distributed. Supply systems are not
				distributed when a habitable space is supplied with outdoor air to ventilate an
interior adjacent room
or an
interior adjoining
				space
. Exhaust systems are not distributed when all bathrooms and
				kitchens are not exhausted by the whole house ventilation system. If either the
				supply system or the exhaust system is not distributed, then the ventilation
				quality adjustment system coefficient adjustment is required in accordance with
				Section C403.4.3.
ENCLOSED KITCHEN.
A kitchen whose permanent
				openings to interior adjacent spaces do not exceed a total of 60 square feet (6
				m2).
INTERIOR ADJACENT ROOM.
An enclosed room without
				exterior windows or openings to the outdoors located within a dwelling or
				sleeping unit that does not have interior unobstructed openings required for an
interior adjoining space
.
INTERIOR ADJOINING SPACE.
A room or space without
				openings to the outdoors that is naturally ventilated from another habitable
				space by unobstructed fixed openings size in accordance with Section
				402.3.
LOCAL EXHAUST.
An exhaust system that uses one or
				more fans to exhaust air from a specific room or rooms within a residential
				dwelling or sleeping unit.
PERMANENT CONSTRUCTION.
Construction that, if
				removed, would disturb the structural integrity of the building or the
				fire-resistance rating of a building assembly.
RELIEF AIR.
Exhausted return air from a system
				that provides ventilation for human usage.
REPLACEMENT AIR.
Outdoor air that is used to
				replace air removed from a building through an exhaust system. Replacement air
				may be derived from one or more of the following: Makeup air, supply air,
				transfer air, and infiltration. However, the ultimate source of all replacement
				air is outdoor air. When replacement air exceeds exhaust, the result is
				exfiltration.
WHOLE HOUSE VENTILATION SYSTEM.
A mechanical
				ventilation system, including fans, controls, and ducts, which replaces, by
				direct means, air from the habitable rooms with
outdoor
				air
.
VENTILATION ZONE.
Any indoor area that requires
				ventilation and comprises one or more spaces with the same occupancy category
				(see Table 403.3.1.1), occupant density, zone air distribution effectiveness
				(see Section 403.3.1.1.1.2), and design zone primary airflow per unit
				area.
Statutory Authority:
				  RCW
				    19.27.031,
				  19.27.074 and
				  chapters
				  19.27 and
				  34.05 RCW. 13-04-053, §
				  51-52-0202, filed 2/1/13, effective 7/1/13. Statutory Authority:
				  RCW
				    19.27.190,
				  19.27.074,
				  19.27.031 and
				  chapters
				  19.27 and
				  34.05 RCW. 10-03-099, §
				  51-52-0202, filed 1/20/10, effective 7/1/10. Statutory Authority:
				  RCW
				    19.27.190,
				  19.27.020, and
				  chapters
				  19.27 and
				  34.05 RCW. 07-01-092, §
				  51-52-0202, filed 12/19/06, effective 7/1/07. Statutory Authority:
				  RCW
				    19.27.031 and
				  19.27.074. 04-01-104, §
				  51-52-0202, filed 12/17/03, effective
				  7/1/04.