Definition of Air Space

Air Space

The area between insulation facing and interior of exterior wall coverings. Normally a 1" air gap.

Radiant Barrier System

A Radiant Barrier System (RBS) is a building section that includes a radiant barrier facing an air space.

Reflective Insulation System

Reflective Insulation System is formed by a combination of low emittance surfaces and air spaces that provide reflective cavities, which have low levels of radiant energy transmission.

Central Air Conditioning

A system which uses ducts to distribute cooling and/or dehumidified air to more than one room or uses pipes to distribute chilled water to heat exchangers in more than one room, and which is not plugged into an electrical convenience outlet.

Crawlspace Foundation

The space between the ground and the first floor of a home, usually no higher than four feet.

Crawlspace Vent

An opening to allow the passage of air through the unexcavated area under a first floor. Ideally there should be at least two vents per crawlspace.

Forced Air Heating

A common form of heating with natural gas, propane, oil or electricity as a fuel. air is heated in the furnace and distributed through a set of metal ducts to various areas of the house.

Baffles

Device to help achieve a ventilation space between insulation and roof sheathing. It helps assure air flow from the eave vents in attics and cathedral ceilings.

Convection

Convection is the transfer of heat in fluid or air, caused by the movement of the heated air or fluid itself. In a building space, warm air rises and cold air settles to create a convection loop and is termed free convection. Convection can also be caused mechanically by a fan and is termed forced convection.

Square Footage, Living

The square footage in a home that is heated and/or cooled. The space occupied by two-story rooms and stairwells is counted once in the lower floor's square footage. Living square footage does not include garages, bonus rooms, or porches unless otherwise noted.

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