Air Vent Attic Exhaust Fan Humidistat Settings

Remember, the higher the cfm the more air exchanges per hour. Eliminating mold and mildew on the roof structure is the ultimate goal. Most attic fans operate with a thermostat that automatically turns the fan on and off based on a temperature the homeowner sets.

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But if a power attic fan is not equipped with a humidistat feature, it will only fight heat buildup.

Air vent attic exhaust fan humidistat settings.

In winter, the humidistat operates the attic fan when the relative humidity exceeds a preset level (usually 40 to 50%). Humidity control in a crawlspace is sometimes needed. Temp control in warm/hot weather, yes.

For an attic fan, the best humidity level to be set on the humidistat is 50%. For example, if the indoor temperature is 70 degrees and the outdoor temperature is. I installed soffit vents all around and put in an attic fan (with thermostat and humidistat) where one of the passive vents(i have 3) were.

That is, if the relative humidity in the attic exceeds 50% then the attic fan will turn on. What causes excess attic humidity anyway? At its lowest speed, this fan is capable of moving 2081 cfm of air.

If either setting is too low, fan will run continuously. Here are some possible explanations: In summer, the thermostat operates the fan when the attic temperature reaches a preset level (usually 90 to 95 degrees f).

You might also install a humidistat that automatically turns. Attic square feet x 0.7 = cfm (cubic feet of air moved per minute). 30% more for roofs 11/12 and higher.

Power vents with balanced motor and blade design, power vents quickly exhaust heat or humidity from any attic. Fan runs less with higher setting. Which attic vent fan are good in the current market?