About Master Flow™ Roof Louver IR65 Plastic Slant‑Back
Our best plastic slant-back roof louver with built-in screen is an excellent choice to help protect against weather infiltration, especially in steep-slope applications. It's manufactured with UV-resistant polymer and a snap-in hood to help ensure lasting performance on the roof. Its extra-large flashing is pre-punched nail holes for reduced chance of leaks and easy installation. Available in four popular colors, it provides a large 65 sq. in. (41,935 mm2) of NFA to help exhaust heat and moisture from your attic.
Note: Always have a balanced ventilation system. In no case should the amount of exhaust ventilation exceed the amount of intake ventilation.
Features & Benefits
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OPTIMAL PERFORMANCE
Slant-back design is an excellent choice to help protect against weather infiltration, especially in steep-slope applications -
30% MORE VENTILATING CAPACITY*
A full 65 sq. in. of net free ventilating area (NFA) (41,935 mm2) per vent -
ECONOMICAL
Fewer vents needed for installation*
*Compared to typical 50 sq. in. NFA (32,258 mm2) roof vents.
Note: Always have a balanced ventilation system. In no case should the amount of exhaust ventilation exceed the amount of intake ventilation.
![](https://product-assets.gaf.ca/media/catalog/product/w/a/warranties_windproven_4.jpeg)
Eligible accessory product in the Attic Ventilation Category of GAF Residential Enhanced and WindProven™ Limited Warranties*
Product Documentation
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MasterFlow® RoofLouver IR65 Plastic Slant-Back Installation Instructions TRILINGUAL - RESMF178
Installation Instructions and Guides