Increasing exhaust capacity also increases required intake. GAF warns that insufficient intake can reduce effectiveness, strain equipment or pull air through unintended openings.
GAF technical bulletin: Power attic vents & the importance of proper attic intake ventilation.
What this means for your roof
Increasing exhaust capacity also increases required intake. GAF warns that insufficient intake can reduce effectiveness, strain equipment or pull air through unintended openings.
A useful question for your contractor
Ask for the fan model’s intake requirement and the available net free intake area.
Ask for the answer to be tied to the actual roof condition and the exact product being installed. Keep the agreed repair or installation detail with your estimate and project photos.
Bulletin revision: February 1, 2021. This is the date of the manufacturer source, not a claim that this website guide existed on that date.
Read GAF: Power attic vents & the importance of proper attic intake ventilation
This homeowner summary explains the cited bulletin. The complete manufacturer document and current product instructions govern the installation details. A requirement for one manufacturer or product should not be transferred to another without checking.