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  2. Vapor barrier - Wikipedia

    en.wikipedia.org/wiki/Vapor_barrier

    The function of a vapor barrier is to retard the migration of water vapor. A vapor barrier is not typically intended to retard the migration of air. This is the function of air barriers. [8] Air is mixed with water vapor. When air moves from location to location due to an air pressure difference, the vapor moves with it.

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

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

    "[Since] HVAC systems push air through the air ducts that run throughout the home in walls, ceilings, and floors [the] movement of air through these HVAC/furnace systems has the potential to ...

  4. Fire damper - Wikipedia

    en.wikipedia.org/wiki/Fire_damper

    Interior of German mechanical fire damper inside of a galvanised steel duct. Fire dampers (or fire shutters) are passive fire protection products used in heating, ventilation, and air conditioning (HVAC) ducts to prevent and isolate the spread of fire inside the ductwork through fire-resistance rated walls and floors. [1]

  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. The air in your home could be making you sick - AOL

    www.aol.com/air-home-could-making-sick-184905028...

    The most effective way to purify the air in your home is with a purpose-built purification system that can help you track the air quality in the room and remove contaminants from the air ...

  7. Interstitial condensation - Wikipedia

    en.wikipedia.org/wiki/Interstitial_condensation

    Interstitial condensation is a type of condensation that may occur within an enclosed wall, roof or floor cavity structure, which can create dampening.. When moisture-laden air at dew point temperature penetrates inside a cavity of the structure, it condenses into liquid water on that surface.

  8. Anti-fog - Wikipedia

    en.wikipedia.org/wiki/Anti-fog

    A demister is a substance applied to transparent surfaces to stop them from becoming fogged with mist deposit, often referred to as fog. Scuba divers often spit into their masks and then wash the surface quickly with water to prevent mist buildup that can impair vision. Several products are commercially available such as Sea Drops that are ...

  9. Damp (structural) - Wikipedia

    en.wikipedia.org/wiki/Damp_(structural)

    The dampness results in vaporization where water vapor is transmitted into the building's interiors. Water vapor may enter the building through supply air ducts in building slabs and circulated by warm forced air. Water vapor can also enter a building through leaky return air ducts in homes with crawlspaces. [4]: 185–187

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