Warm moist air trapped in the attic condenses and freezes on the wood.
Retrofitting attic ventilation.
Without the vents there s no place for outside air to enter the attic.
Photo by merle henkenius.
Frost on the underside of the roof or rafters.
Space the holes 12 to 14 in.
Retrofits are as easy as 1 2 3.
You can also spot this in the summer.
Many homes appear to have soffit vents but only have vent screens with no air intake.
Here are the signs to look for.
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Model asf 12 rf has a 12 in.
Locate the soffit vents.
A sign that condensation is.
Next lay the strip vent down on a flat wood surface such as a plywood sheet or long 2 x 4 and drill 1 8 in dia.
Dia throat opening and a 10 watt solar panel providing energy to 4 ec fans on sunny days to increase the cfm cubic feet per minute of 740 at 0 1 sp of air flow performance.
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Water stained or blackened wood.
The aura solar attic fan retrofit will exhaust air continuously by using solar and wind power for optimum ventilation performance.
Retrofit attic baffles for cathedral and vaulted ceiling ventilation.
Screw holes through both flanges.
Making sure your home has soffit vents is an integral part of proper attic ventilation.
Learn more about the vulcan vent.
A sign of mildew or rot.
Inside the attic behind existing gable and eave vents the matrix can be cut to size and fastened to the existing 1 4 screen.