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2. Smoke exhaust ductwork - Wikipedia

   en.wikipedia.org/wiki/Smoke_exhaust_ductwork

   ISO6944 - 2008 Fire containment -- Elements of building construction -- Part 1: Ventilation ducts "Wisegeek" page on return air ductwork. Return air ductwork can be co-opted for cold smoke exhaust in North America

3. Plenum space - Wikipedia

   en.wikipedia.org/wiki/Plenum_space

   Vertical section through a commercial building using HVAC plenum instead of airspace plenum. When both the supply and return ducts are constructed in this manner, it is possible to insulate the ducts and the dropped ceiling so that the upper airspace is not heated or cooled, increasing energy efficiency.

4. Air-mixing plenum - Wikipedia

   en.wikipedia.org/wiki/Air-mixing_plenum

   An air handling unit used for the heating and cooling air: (1) supply air (2) fan section (3) vibration isolator (4) cooling coil (5) filter (6) mixed air duct. Air supply to a building is generally performed by an air handling unit. The process may include filtering, heating, cooling, humidification, or dehumidification, all of which consume ...

5. Smoke damper - Wikipedia

   en.wikipedia.org/wiki/Smoke_damper

   Smoke damper may be used to prevent the spread of smoke from the space of fire origin to other spaces in the same building. A combination of fans and dampers can exhaust smoke from an area while pressurizing the smoke-free areas around the affected area (inhibiting smoke infiltration into additional areas).

6. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   Ducts for air pollution control in a 17000 standard cubic feet per minute regenerative thermal oxidizer (RTO). A round galvanized steel duct connecting to a typical diffuser Fire-resistance rated mechanical shaft with HVAC sheet metal ducting and copper piping, as well as "HOW" (Head-Of-Wall) joint between top of concrete block wall and underside of concrete slab, firestopped with ceramic ...

7. No, You Don't Need to Clean Your Air Ducts Every Year ... - AOL

   www.aol.com/no-dont-clean-air-ducts-110500245.html

   "An inspection can help determine if air ducts need cleaning by checking for visible dust buildup, mold growth, or signs of pest infestations, offering a clear indication of when professional ...