The Fundementals of Smoke Control
1-14 Infinity Smoke Control Guide
TOC
Positioning Air Inlets and Outlets
You need to carefully consider the placement of the air inlets and outlets
on your building. If you place an outlet that vents smoke too close to an
air inlet, the air intake can draw the smoke back into the building.
Since smoke rises, the exhausts that vent smoke should be placed well
above air inlets. The exhausts should be placed at least 3 ft above the
roof level, to allow space for the smoke to rise and disperse.
Keeping smoke outlets far away from air inlets does not guarantee that
the air brought into the building is always smoke free. You may want to
place smoke detectors in air inlets that operate during a smoke
emergency. If the detector finds smoke in the incoming air, it alerts the
control system. The control system has to decide whether or not to shut
down the air inlet.
You should refer to NFPA 90A for more information on smoke
detectors in inlets and outlets.
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