--- title: Does an attic insulation baffle allow a rectangular undereave vent to have its intended net free area of airflow or is it reduced by the baffle? description: Airflow does not only channel directly upward through the insulation baffle. Some of the airflow channels to nearby rafter bays. --- [Skip to content](https://help.gibraltarbuildingproducts.com/migration/en/knowledge/does-an-attic-insulation-baffle-allow-a-16#main-content) English Show submenu for translations ![GBAD Full Color.png\]](https://help.gibraltarbuildingproducts.com/hs-fs/hubfs/GBAD%20Full%20Color.png?height=40&name=GBAD%20Full%20Color.png) - [Default HubSpot Blog](https://semetals-1971711.hs-sites.com/blog) Open main navigation Close main navigation - [Default HubSpot Blog](https://semetals-1971711.hs-sites.com/blog) - English Show submenu for translations - Go to www.gibraltarbuildingproducts.com Go to www.gibraltarbuildingproducts.com Hello. 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Some of the airflow channels to nearby rafter bays. Airflow does not only channel directly upward through the insulation baffle. Some of the airflow channels to nearby rafter bays. Thus, the total NFA of the vent is realized provided the insulation is not blocking the other bays. - [Default HubSpot Blog](https://semetals-1971711.hs-sites.com/blog) [![Gibraltar Building Accessories Logo](https://help.gibraltarbuildingproducts.com/hs-fs/hubfs/GBAD.jpg?width=2500&height=777&name=GBAD.jpg "Gibraltar Building Accessories Logo")](https://www.gibraltarbuildingproducts.com/) www.gibraltarbuildingproducts.com Help Center Copyright © 2026, Gibraltar Building Accessories Division