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• When venting a bathroom exhaust fan, make sure to vent the air to the outside, rather than into your attic where it can cause mold and mildew to form. Options for venting a bathroom exhaust fan include (best to worst): Through the roof or an exterior gable wall. Behind a gable vent.

• The CFM rating of a bathroom fan is a measurement of how many cubic feet of air it can ventilate out every minute. To vent a bathroom properly, the bathroom fan must have a CFM rating that is able to change the air eight times every hour.

• - Switch the power off at the fuse box. - Remove the wiring panel or knockout from the fan housing with a flathead screwdriver. - If necessary, assemble the fan according to manufacturer instructions. This may include attaching the damper and duct connector to the fan housing. - Mount the housing to the ceiling. The bottom of the housing should be flush with the ceiling and perpendicular to the joist or stud. ... - Connect the duct. Secure the duct to the duct connector using duct tape or clamps. - Connect the house and fan wiring. Pull the existing wire through the hole and into the housing. ... - If necessary, slide the blower into the housing and secure. - Finish the ceiling work – the hole should align with the edge of the fan housing. - Slide the grille into place and secure. - Turn the power back on once installation is complete.

• Multiply the bathroom's square footage by the ceiling height: 80 x 10 = 800 Divide that number by 60 (minutes in an hour), and round the answer up to the next whole number: 800 ÷ 60 = 13.33 (which you then round up to ... Multiply that number by 8 (the target number of air exchanges in one hour): 14 x 8 = 112

• Calculation: Area of the Room=Length x Width x Height Area of the Room=10 x 15 x 10 =1500 Cub. Foot From the table Air Changing Rate (ACH) for Bathroom = 8 Times/Hour. Size of Ventilation Fan = (Area of Room x ACH ) / 60 Size of Ventilation Fan = (1500 x 8 ) / 60 = 200 CFM Size of Ventilation Fan = 200 CFM

• To determine the proper size vent fan you need for your bathroom: Calculate the number of cubic feet in the bathroom by multiplying the room’s height x width x length in feet. Divide the number of cubic feet in your bathroom by the number of minutes in an hour (60). Multiply that number by the recommended number of air exchanges per hour (8).

1.0 sone: A 1.0 sone rating is roughly equivalent to the sound of a refrigerator running. 2.0 sones: 2.0 sones is the noise level in a normal office workplace. 3.0 sones: A fan rated at 3.0 sones will be roughly as loud as a face-to-face conversation.

To get the right fan for your bathroom, use the guidelines set by the Home Ventilating Institute: Your fan should have 1 cfm for every square foot of floor space in your bathroom. For bathrooms larger than 100 square feet, figure your cfm requirements by adding: 50 cfm for every toilet.

To figure out the right fan size, first determine the area of your bathroom. Measure the length and width of your bathroom and the height of its ceilings. Then use those measurements in this formula: Length x Width x Height = Bathroom Size.