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2. Process duct work - Wikipedia

   en.wikipedia.org/wiki/Process_Duct_Work

   Fabric joints are often chosen to separate the duct segments because they usually cost 40% less than metal joints. Also metal joints place an additional loads onto duct segments. Metal joints prefer axial movements, and provide significant lateral loads onto duct segments. fabric joints cost $100 to $200 per square foot of joint (2010).

3. American Residential Services - Wikipedia

   en.wikipedia.org/wiki/American_Residential_Services

   The name "Rescue Rooter" was trademarked in 1976 by the California-based Rescue Industries Inc. [5] It was a family-owned West Coast plumbing and drain cleaning company. [6] In 1996, ARS was founded to consolidate local and regional HVAC service companies.

4. Blower door - Wikipedia

   en.wikipedia.org/wiki/Blower_door

   Leakage area estimates can also be normalized for the size of the enclosure being tested, For example, the LEED Green Building Rating System has set an airtightness standard for multi-family dwelling units of 1.25 square inches (8.1 cm 2) of leakage area per 100 square feet (9.3 m 2) of enclosure area, to control tobacco smoke between units.

5. Register (air and heating) - Wikipedia

   en.wikipedia.org/wiki/Register_(air_and_heating)

   Ideally, a room will have both heating and cooling registers. In practice, cost considerations usually require that heating and cooling be provided by the same register. In such cases, heating most often takes precedence over cooling, and registers are usually found close to the floor. [7] For heating purposes, a floor register is preferred.

6. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   The three major functions of heating, ventilation, and air conditioning are interrelated, especially with the need to provide thermal comfort and acceptable indoor air quality within reasonable installation, operation, and maintenance costs. HVAC systems can be used in both domestic and commercial environments.

7. 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 ...