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Overview:
This project will show you how to install an attic fan. Keeping your attic well ventilated year round can prevent excessive build-up of heat and moisture. A well-ventilated attic is less prone to mold and mildew and helps to keep your whole house cooler. For the most effective cross-ventilation, vents should be located low (as soffit grilles) and high (gable wall vents, ridge vents, roof vents or fans).
Materials:
wall-mounted attic ventilator, work light and extension cord, pocket calculator, extension ladder, 2"x4" and 3"x4" plywood, nails
Tools You'll Need:
10ft. or 25ft. tape measure, 4-in-1 level, power-lite cordless drill and 1/2" spade bit, 16oz. hammer, 6-in-1 interchangeable screwdriver
Before You Begin:
Installing an attic fan may require removal and reinstallation of exterior siding. Make sure you have the appropriate tools. Also, the final step to installing an attic fan is making the wiring connections. Unless you are already a licensed electrician, we recommend you call in professional help for this final part of the project.
Barbara's Tips:
If you are removing and reinstalling siding, contact the manufacturer for how-to information for the particular type of siding on your house.
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Step 1: Some Math Homework
Before you can install your fan, you need to determine its capacity. The Home Ventilating Institute recommends that one or more fans provide at least 10 air exchanges per hour. To calculate: Multiply the Length by the Width of your attic floor and multiply by .07 to arrive at the cubic fee per minute of air that your fans must move. Formula: (L x W) x .07 = CFM. Add 15 to 20 percent to the result for steep roof pitches, or if you have dark roof shingles. Now divide the CFM capacity by 300 and multiply by 144 (here's where you'll need that calculator!) This is the number of square inches you will need of intake vents. Formula: (CFM/300) x 144 = min. area in square inches. Complete your math assignment by contacting the Home Ventilating Institute for additional information on soffit vents.
Step 2: If You Passed the Math Test – You
Head outside for some fresh air and using the template for the louvered vent for the fan, level it below the roof peak. Following the manufacturers instructions, cut the opening with a jig saw. Some homes may already have a louvered vent (without a fan). If so, skip the cutting and go right to the next step.
Step 3: Frame and Finish
Still working from the exterior, following manufacturer's directions install adequate framing for the fan. Secure the exterior accessory shutter and reinstall siding if necessary. Head back to your attic and mount the fan to the framing. Install the controller panel.
Step 4: A Phone Call is All it Takes
Have a qualified electrician connect the wiring according to manufacturer's specifications. Now, turn on the fan and enjoy the benefits of fresh, circulating air. You did it yourself!
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