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

Elevated Aesthetics

Sleek, modern design is available in 4 popular colors to help streamline the roof's finished look
Ventilation Codes

Meets ventilation codes that require a minimum of 12.5 sq. in. of net-free ventilation area for rooftop bath, dryer, and appliance vents⁴
Tested Tough

Passes rigorous 110 mph wind-driven rain testing per TAS100(A) and the UL 2218 Class 4 impact resistance test⁵

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

⁵Testing conducted under controlled laboratory testing. Hail damage is not covered under GAF limited warranties.

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

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.
Step 2

Fasten the vent's base flashing to the roof deck using the pre-punched nailing slots.
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.

GAF’s Lifetime Roofing System

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