Customer Reviews for Maxx Air 1400 CFM Brown Galvanized Steel Power Attic Roof Ventilator

We are sorry to hear that your fan quit working. We test all of our motors before they are shipped out, but unfortunately it sounds like you received a defective motor. Feel free to call for warranty next time at (800) 433-1626 or email at rtv@bvc.com.

TJS,

You may have discussed this with our Warranty department already but please be sure that you have adequate intake ventilation installed that correlates with your exhaust.

Here is our basic directive on intake air.

Depending on your local building code, you may need to either provide 1 square foot of ventilation per 150 sq. feet of attic space or 1 sq. ft. per 300 sq. feet.

Once you determine the square footage of your attic, divide by either 150 or 300 to get the required sq. ft. of ventilation. Divide that by 2 to get the required amounts of intake and exhaust area. You divide by two to follow the 50/50 rule of ventilation which is to provide 50 percent intake and 50 percent exhaust. Use the Net Free Air (NFA) rating of the vents to calculate how many units you will need as intake and exhaust. To convert between sq. ft. and sq. inches divide the sq. ft. by 144.

Intake ventilation is generally vents such as soffit vents along the eaves of the roof. Exhaust ventilation is gable vents, static roof vents such as slant backs and domed vents and wind turbines.

Example using 1/300 rule -

A 1500 sq. ft. attic space would require 5 sq. ft. of ventilation or 2.5 sq. ft. of intake and 2.5 sq. ft. of exhaust. You will need 360 sq. inches of ventilation for intake and 360 sq. inches of exhaust. Intake ventilation such as our Soffit CX64 4" x 16" vent provides 22 sq. inches per piece. You would need 16.3 or 17 pieces of CX64 along the under eave for intake ventilation. Our VX25 Static Vent dome provides 144 sq. inches per unit which would be 2.5 or 3 pieces of VX25 as exhaust ventilation.

TJS,

You may have discussed this with our Warranty department already but please be sure that you have adequate intake ventilation installed that correlates with your exhaust.

Here is our basic directive on intake air.

Depending on your local building code, you may need to either provide 1 square foot of ventilation per 150 sq. feet of attic space or 1 sq. ft. per 300 sq. feet.

Once you determine the square footage of your attic, divide by either 150 or 300 to get the required sq. ft. of ventilation. Divide that by 2 to get the required amounts of intake and exhaust area. You divide by two to follow the 50/50 rule of ventilation which is to provide 50 percent intake and 50 percent exhaust. Use the Net Free Air (NFA) rating of the vents to calculate how many units you will need as intake and exhaust. To convert between sq. ft. and sq. inches divide the sq. ft. by 144.

Intake ventilation is generally vents such as soffit vents along the eaves of the roof. Exhaust ventilation is gable vents, static roof vents such as slant backs and domed vents and wind turbines.

Example using 1/300 rule -

A 1500 sq. ft. attic space would require 5 sq. ft. of ventilation or 2.5 sq. ft. of intake and 2.5 sq. ft. of exhaust. You will need 360 sq. inches of ventilation for intake and 360 sq. inches of exhaust. Intake ventilation such as our Soffit CX64 4" x 16" vent provides 22 sq. inches per piece. You would need 16.3 or 17 pieces of CX64 along the under eave for intake ventilation. Our VX25 Static Vent dome provides 144 sq. inches per unit which would be 2.5 or 3 pieces of VX25 as exhaust ventilation.