WAC 296-96-02450
Can pipes and ducts be installed above
a machine room? Electric conduit and ducts may be installed
in the upper space ("upper space" is defined as the space
above the fire-rated ceiling) of the elevator machine room as
long as they are installed above the required seven-foot
clearance and they do not interfere with the elevator
equipment which also must be installed to allow a seven-foot
clear head room.
(1) Straight through runs of electrical conduit without
junction boxes can be installed in this space.
(2) Pipes and ducts conveying gases, vapor, or liquids
may be installed in the space above the machine room provided
they are encased in a noncombustible secondary pipe without
joints, or a moisture barrier without penetration.
EXCEPTION:
Residential elevators are exempt from this section.