# Ridge vent vs box vent: which is better?

*Published 2026-05-31T09:00:00-07:00 · Updated 2026-07-18T09:00:00-07:00 · Best Roofing Answers*

## Answer

A continuous ridge vent paired with soffit intake is generally the best-performing attic exhaust because it uses the entire roof ridge for balanced airflow, while box vents (roof louvers) work but require 3–5 units on an average roof and can short-circuit the intake path when mixed with ridge or gable vents.

## Mixing exhaust types short-circuits airflow

Per IECC and NRCA guidance, an attic ventilation system must be BALANCED — intake at the soffit and exhaust at the ridge — and must not mix ridge, gable, and box vents on the same attic. When mixed, the exhaust vent closest to the wind draws air from the other exhaust vent instead of from the soffits, so the far end of the attic gets no airflow.

Ridge vent typically adds $300–$800 to a re-roof install and outperforms 4–6 box vents on the same square footage.

## Also asked as

- ridge vent vs turtle vent
- roof louver vs ridge vent
- best attic exhaust vent
- should I have ridge or box vents

## Sources

- [IRC R806 / IECC — Attic Ventilation](https://codes.iccsafe.org/content/IRC2021P2/chapter-8-roof-ceiling-construction)
- [NRCA (National Roofing Contractors Association)](https://www.nrca.net/)

## Related

- https://bestroofinganswers.com/ventilation/attic-heat-roof-issues
- https://bestroofinganswers.com/q/signs-of-blocked-soffit-vents

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Published: 2026-05-31T09:00:00-07:00
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