Home > Attic Fans and Wholehouse Fans > Attic Fan (Roof Mount) >

Broan Roof Mounted Attic Fan 350BK

Broan 350BK
Item #: 350BK
Retail: $190.56 Price: $144.96
You Save: $45.60 (23.9%)

Roof Mounted Attic Fan 350BK

Roof Mounted Attic Fan 350BK moves 1050 CFM for up to 1500 square feet and exhaust the trapped attic air that can easily reach 150 degree's or more. These Roof Mounted Attic help remove super heated attic air, making any home more comfortable whether it's air conditioned or not. In those homes that are cooled by attic fans the air conditioners run less and don't have to work nearly as hard. And all Broan Powered Roof Mounted Attic fans are as efficient as they are dependable. This 350BK is a14 inch diameter steel blade specially designed for maximum air movement. This Roof Mounted Attic Fan operates automatically. It comes with an adjustable thermostat that allows you to dial in when it comes on from 70 to 120 degrees. Thermally protected, permanently lubricated motor.


  • Durable Black, Fade-Resistant PVC Dome Can Be Painted To Match Roof Color
  • Mounts Easily Between Rafters - Template Included For Cutting Roof Boards And Shingles
  • Mesh Screen Keeps Out Birds And Insects
  • 3 7/8 inch High Splash Guard Helps Keep Out Rain
  • Heavy Gauge Metal Flashing Stands Up To Nailing And Tarring, Regardless Of Climate
  • Thermostat And Motor Accessible From Outside For Easy Servicing, If Required
  • HVI Certified Air Delivery 0.03 inch Static Pressure
  • 1050 CFM For Attics Up To 1500 Sq. Ft

Roof Mounted Attic Fan 350BK

Specification Sheet

Installation Guide

Technical Specs

Amperage 3.6
Attic Size 1500
CFM 1050
Description PAV-Roof Mount
Diameter 23.25
Dome Material PVC
Height 8
Housing Height 8
Housing Length 22.25 Sq
Housing Width 23.25 Dia Dome
Includes Thermostat Yes
Inlet Area 3.5
Installation Type Roof Mount
Mesh Screen Mesh screen keeps out birds and insects
Motor Thermally protected, permanently lubricated motor.
Rain Guard 3 7/8" high splash guard helps keep out rain.
RPM 1000
Solar No
Sones NA
Voltage 120
Width 22.25

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 needed to exhaust the attic. For darker roofs add 15% to the CFM you just calculated. For exceptionally large attics use two fans that have sufficient exhaust or it will pull the heat back down into the house.

1. Use this unit only in the manner intended by the manufacturer. If you have questions, contact the manufacturer at the address or telephone number listed in the warranty.

2. Before servicing or cleaning unit, switch power off at service panel and lock the service disconnecting means to prevent power from being switched on accidentally. When the service disconnecting means cannot be locked, securely fasten a prominent warning device, such as a tag, to the service panel.

3. Installation work and electrical wiring must be done by a qualified person(s) in accordance with all applicable codes and standards, including fire-rated construction codes and standards.

4. Sufficient air is needed for proper combustion and exhausting of gases through the flue (chimney) of fuel burning equipment to prevent back drafting. Follow the heating equipment manufacturer's guidelines and safety standards such as those published by the National Fire Protection Association (NFPA), and the American Society for Heating, Refrigeration and Air Conditioning Engineers (ASHRAE), and the local code authorities.

5. When cutting or drilling into wall or ceiling, do not damage electrical wiring and other hidden utilities.

6. The wiring must be permanent. DO NOT USE AN EXTENSION CORD! Use 14 GA. MINIMUM copper wire. Although the Powered Attic Ventilator may be wired directly to power, we advise that some type of shut off switch be installed in the line. Please see the section on electrical wiring for suggested wiring diagrams and instructions.

7. This unit must be grounded.

8. Do not use this unit with any solid state speed control device.

9. For general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors.

10. To avoid motor bearing damage and noisy and/or unbalanced impellers, keep drywall spray, construction dust, etc. off power unit.

11. This unit has an unguarded impeller. Do not use in locations readily accessible to people or animals.

12. Fan is equipped with a thermostat which may start fan automatically. To reduce risk of injury or electric shock while servicing or cleaning unit, switch power off at service panel and lock service panel to prevent power from being switched on accidentally. When the service disconnecting means cannot be locked, securely fasten a prominent warning device, such as a tag, to the service panel.

13. Home Ventilating Institute (HVI) recommends one square foot of open air inlet per 300 CFM of fan capacity. The best location for these air intake vents are under the eaves with direct access to the attic. Failure to provide these intakes could cause natural-draft gas appliances to back draft.

14. Your attic fan installation will create a screened opening into your attic space. During a heavy rain storm there could be a light spray of rain into this attic space. This is a normal condition with all attic ventilators and will not cause any damage to the structure. We recommend that you do not store any valuable articles directly under the fan opening in the roof. During extreme rain and wind storms you may want to turn on your attic ventilator to prevent excess moisture accumulation in your attic.

15. Records show, under ideal conditions, exposed galvanized steel can remain rust free up to 100 years. For best protection, the exposed portion of the roof sheet should be painted, especially in areas of unusually high industrial air pollution. Follow paint manufacturer's instructions for good adhesion.

16. This ventilator is intended for roof installation. The Broan Model 353 Gable Mount Ventilator is available for side wall applications.

17. The dome may be painted with a high-quality paint. Follow the paint manufacturer's recommendations for PVC plastic or aluminum, as appropriate.

Product Reviews
Overall Customer Rating:
review-star review-star review-star review-star review-star
Customer Reviews: 1
A must in hot climates
review-star review-star review-star review-star review-star
R. Clark
Review Date:

I purchased the Broan 350BK to replaced an older attic fan that had burnt out over the summer. The Broan 350 was significantly lighter than the unit being replaced which made handling the unit on the roof a lot easier. The construction and materials used, particularly the base metal flashing, are quite robust and I like the 'brushed' look of the PVC plastic dome.
The installation itself is quite simple for anyone with modest carpentry (I highly recommend using the template which comes printed on the box) and electrical abilities. If you do choose to do it yourself, I recommend installing an isolation switch (available online or from your local hardware store) just prior to the fan so that it is not energized year round. If you have not done any roofing work before, I highly recommend getting a pair of adjustable roofing brackets and a long 2" * 10" scaffolding plank or board to provide a stable work area while working on your roof.

The unit has worked great since installation and there is a substantial difference in the air temperature in my attic, particularly in light of the high temperatures this summer.

One thing to note: unlike most older fans, this attic fan will run until the air temperature in the attic is 10 degrees below the set point. I have mine set to ~110'F so it will start to run once the attic temperature hits 110'F and continue to run until the temperature has dropped to 100'F.
Home Products Inc.
Ph: 866.368.8663
Hrs: MON-THU 8am to 5pm
        FRI 8am to 4:30pm PST
Broan® and NuTone® are trademarks of Broan-NuTone, LLC,
its subsidiaries and affiliates.
All other brands are trademarks of their respective owners.

© 2011 Q2U, LLC a limited liability company. All Rights Reserved.