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  2. Air-mixing plenum - Wikipedia

    en.wikipedia.org/wiki/Air-mixing_plenum

    The most common application for an air-mixing plenum is the mixing of return air (or extract air) with fresh air to provide a supply air mixture for onward distribution to the building or area which the ventilation system is serving. [1] The air transferred from the return air stream to the supply air stream is termed recirculated air.

  3. Air changes per hour - Wikipedia

    en.wikipedia.org/wiki/Air_changes_per_hour

    Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour.

  4. How much money do you need to buy a house? 6 costs to calculate

    www.aol.com/finance/much-money-buy-house-6...

    If you have a fixed-rate loan, your monthly mortgage payment is one of your most predictable ongoing costs. Bankrate’s mortgage calculator can help you figure out how much you’ll owe each ...

  5. Plenum space - Wikipedia

    en.wikipedia.org/wiki/Plenum_space

    A non-plenum airspace can become a plenum airspace by accident if the ductwork is disconnected and not properly repaired and resealed. Ductwork disconnection can occur due to building damage such as earthquakes, aging, or adverse environment causing the metal to corrode and fall apart, or simply negligence on the part of building contractors ...

  6. Bell mouth - Wikipedia

    en.wikipedia.org/wiki/Bell_mouth

    Inlet bellmouths (right) on the two turboshaft engines of a heavy-lift helicopter. In building services engineering and HVAC, a bell mouth is a tapered expanding or reducing opening in the end of a ventilation duct, so named because the taper can resemble that of a bell shape.

  7. Plenum cable - Wikipedia

    en.wikipedia.org/wiki/Plenum_cable

    Plenum cable is jacketed with a fire-retardant plastic jacket of either a low-smoke polyvinyl chloride (PVC) or a fluorinated ethylene polymer . Polyolefin formulations, specifically based on polyethylene compounding had been developed by at least two companies in the early to mid-1990s; however, these were never commercialized, and development ...