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Broan 355BR Roof Mounted Powered Attic Ventilator Model 355BR

Broan 355BR 4.3 Amp, Brown, Roof Mounted Powered Attic Ventilator
Item #: 355BR
Retail: $250.77 Price: $167.18
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Broan 355BR Roof Attic Fan

The Roof Attic Fan 355BR by Broan has a brown dome to match the color of your roof. This automatic thermostat helps the temperature in your attic stay below the 200 degree's in the summer. With the Automatic thermostat you can dial to come on between 76 and 120 degrees. This Roof Attic Fan is a 1000 CFM exhaust fan that mounts directly on your roof. Other options like a gable fan can be added to the ends of the home with out cutting the roof if that is a concern. Roof matching domes means attic fan is less noticeable choose from a black or brown. Too often, attic ventilation is overlooked, not to mention ignored as an opportunity for energy savings. Consider this,air trapped in your attic can easily reach 200 degrees or more.


  • Attic Size: Up to 1400 sq. ft.
  • Amps: 4.3
  • CFM: 1000
  • Height: 8"
  • Dome Diameter: 23-1/4"
  • Dome Material: PVC

Broan 355BR Roof Mounted Powered Attic Fan

Amperage 4.3
Attic Size 1715
CFM 1000
Depth 22.25
Dome Material Plastic
Eco Friendly No
Energy Star No
Heater No
Height 8
Humidity Sensing No
Includes Thermostat 120, Yes
Inlet Area 4.0
Installation Type Roof Mount
Kitchen Approved No
Length 2
Material Aluminum, PVC
Mount Type Wall Mount
RPM 1100
Solar No
UL Listed Yes
Width 22.25

Specification Sheet
Installation Guide

How to calculate the CFM needed for your attic application

One square foot of unobstructed inlet area is required for every 300 CFM output.

Multiply your attic square footage by .7 for minimum air delivery need to exhaust the attic. For darker roofs add 15% to the CFM you just calculated. For exceptionally large attics use 2 fans and have sufficient exhaust or it will put the heat back down into the house.

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