Seletcing An Attic Exhaust Fan




Making sure that the attic of your home is well ventilated with an attic exhaust fan is something that is very important to keep in mind. Unventilated attics can be somewhat unsafe because harmful gases and pathogens can be inhaled by the homeowners. Also, the attic gets extremely hot in the summer months since it sits right under the roof.

One example of an attic exhaust fan is the Solar Attic Fan from Attic Breeze. This ventilation fan is a solar powered exhaust fan with 20W of power. Priced between $390-450, this fan (model # AB-201D) is a 1350 CFM speed fan. It has a remote mounted solar panel with 16 ft. of shielded wiring and low profile mounting brackets. It has  self-flashing corrosion resistant vent housing and rodent guard. Other features include a super quiet 14 inch fan and thermal control switch. This unit comes with an unpainted finish so that the homeowner can custom paint it to match the home’s exterior.

Another example of a 20W solar attic exhaust fan is by Natural Light Energy Systems. The cost for this unit is $575 and installs with no electrical wiring. It operates up to 1275 CFM and vents up to 1800 sq. ft.  This fan is fully operational right from the box and is quiet and compact.

When selecting an attic exhaust fan, you must first determine the volume of the attic so that the CFM, or cubic feet per minute, of the fan can be determined. The attic’s volume can easily be measured by multiplying the length, width and height of the attic. The volume is divided by the value of air changes per hour (ACH). Six is the number that is recommended for attics by the Home Ventilating Institute (HVI). This means that an attic with a volume of 2250 cubic feet should have an attic exhaust fan with a CFM of at least 375. Also, the type of roof needs to be taken into account when selecting an exhaust fan since different roofs can store or emit different levels of heat. That information can be found from the roof’s manufacturer.


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