Equal amounts of intake net free area ventilation low at the roof’s edge or in the soffit and exhaust net free area ventilation at or near the ridge.

FAQs

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A phenomenon whereby low pressure resulting from wind passing over a structure or object creates a pulling or lifting action.

Cubic feet of air moved per minute. All motorized vents have a CFM rating that defines the vent's capacity to move air. The higher the CFM number, the greater the vent's capacity.

The condition in which the roof temperature is equalized from top to bottom. An equalized roof temperature can help eliminate the conditions that can lead to the formation of ice dams.

The change of water from vapor to liquid when warm, moisture-laden air comes in contact with a cold surface.

Flow of heat directly through a solid material; responsible for most heat loss or gain in a residence.

Transfer of heat by air currents, i.e., gravity, hot air furnace.

The surface, installed over the supporting framing members, to which the roofing is applied.