The Air Vent AirHawk B144 has a round gray plastic dome. It has a 14 inch opening and 144 sq. inches of NFA. Several of these vents are usually required to properly ventilate the attic. They should be placed evenly across the roof.
A guideline to keep in mind with the Air Vent Air Hawk is that homes require 1 square foot of net free area (the total unobstructed area through which air can enter or exhaust a non-powered vent) for every 150 square feet of attic floor space. If balanced between intake and exhaust vents, the requirement is 1 square foot of net free area for every 300 square feet of attic floor space.
- Multiple roof vents are usually needed to provide the required net free area
- Must be spaced equally over the roof to provide sufficient airflow along the entire roof sheathing
- high-impact plastic dome
- 24" x 24" flashing
- NFA (square inches): 144/pc.
- 15" diameter roof opening dimension