About Master Flow™ Bath & Dryer Rooftop Appliance Vent

The durable, all-metal Master Flow™ Bath & Dryer Rooftop Appliance Vent from GAF is designed to help vent heat and moisture from bath and kitchen exhaust fans, clothes dryers1, and other household appliances through the roof. Its sleek design features a heavy-duty stainless steel removable bird/pest screen1, noise-minimizing damper, removable duct collar, and 4" (102 mm) to 3" (76.2 mm) reducer. The Master Flow™ Bath & Dryer Rooftop Appliance Vent is warrantied against manufacturing defects for up to 50 years or as long as the warranty of the roof cladding adjacent to the vent, not to exceed 50 years2 and is eligible for enhanced warranty coverage when installed by a contractor certified by GAF in connection with a qualifying roofing system.3


Model Description

BDV4BL

 Bath & Dryer Vent 3"-4" Black

BDV4BR

 Bath & Dryer Vent 3"-4" Brown

BDV4GR

 Bath & Dryer Vent 3"-4" Gray

BDV4WW

 Bath & Dryer Vent 3"-4" Weathered Wood

1Always remove bird/pest screen when venting clothes dryers. Consult local building and plumbing codes in your area.

2See GAF Master Flow™ Ventilation Products Limited Warranty for complete coverage and restrictions.

3See GAF System Plus™, Silver Pledge™, and Golden Pledge® Limited Warranties available at gaf.com/warranties for complete coverage and restrictions. Visit gaf.com/LRS for qualifying products.

Features & Benefits

4Code requirements may vary. Always review applicable local building and plumbing codes for specific requirements in your area.

5Testing conducted under controlled laboratory testing.

Video thumbnail showing a Bath and Dryer vent on an asphalt shingle roof.

Delivering performance with modern style

Discover the perfect blend of function and design with the Master Flow™ Bath & Dryer Appliance Vent. It's durable build, excellent performance and sleek, modern look make it a truly premium roofing accessory.
A GAF Rewards card that can be used to help earn reward points on GAF Master Flow rooftop accessory products purchases

Earn GAF Rewards when you buy GAF Master Flow™ rooftop accessory products

Master Flow™ rooftop accessory products are eligible for GAF Rewards points.⁶
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6GAF Rewards is open to professional roofing contractors, builders and remodeling companies in the U.S. and Canada. For complete terms and conditions, special offers and qualifying GAF products in the U.S. visit gaf.com/rewards and for Canada visit gaf.ca/rewards.

How to install the Master Flow™ Bath & Dryer Rooftop Appliance Vent⁷

  1. A contractor inserting the vent’s neck into a circular opening in the roof deck

    Step 1

    Cut a 5.5" (140 mm) diameter circular opening in the roof deck. With the "UP" arrow on the flashing pointing towards the roof peak, insert the vent's neck into opening.
  2. Contractor fastening the vent’s base flashing to the roof

    Step 2

    Fasten the vent's base flashing to the roof deck using the pre-punched nailing slots.
  3. Underneath view of a contractor using the included removable duct collar to hook the vent up to ducts

    Step 3

    Use the included removable duct collar (and reducer, if necessary) to hook the vent up to 4" (101.6mm) or 3" (76.2 mm) round ducts per local building/plumbing codes in your area.

7Always read full application instructions before using or installing GAF products.

Product Documentation

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Parts of a GAF roofing system

Residential warranties
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The finishing touch that helps defend against leaks at the hips and ridges.
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Beautify and protect your roof for years to come.
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Helps shield the roof deck from moisture infiltration.
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Helps prevent leaks caused by wind-driven rain and ice dams.
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