Find ridge vent length from your attic size, then see if it fits your ridge.
How it works
Attic area × 144 ÷ code ratio, then half goes to exhaust. Divide by your vent’s net free area per foot.
Before you order
- Ridge vent needs matching intake at the eaves.
- Cut the slot to the width your vent’s instructions show.
- Do not mix ridge vents with gable vents in the same attic.
Common questions
How wide should the ridge slot be?
Follow the product instructions, since slot width affects net free area.
What if my ridge is too short?
Add other exhaust like roof louvers, and confirm the balance with your installer.