Attic Moisture Fan

The ideal way to control the operation of an attic fan is with a thermostat and a humidistat.

Attic moisture fan.

By adding moisture to the lower floor you increase the partial pressure of the water vapor which pushes it to areas of lower vapor pressure like the attic. Humidity settings are another issue that can make or break the performance of your heating and cooling systems and your attic ventilation. The short answer to this very involved question and the pages of temperature and humidity level data you sent is yes there is a risk that moisture from humid air in your attic will condense on. A powered attic ventilator has a different purpose.

Whole house fans work on the principle of removing the hot and humid air out of the house. The normal indoor humidity range in winter should be 15. An attic fan pulls hot air out of the space and draws in cooler air from outside. An attic fan changes the air regularly so moisture doesn t get a chance to settle and do damage.

If you raise the attic temperature the rh in both places would be the same. An attic fan works by exchanging the hot air in your attic space for fresh air pulled through the vents. The whole house fan is installed inside the attic between the living space and ceiling. It is designed to lower the temperature of an attic by exhausting air from the attic and replacing attic air.

The difference in the two spaces is the dry bulb temperature. In summer the thermostat operates the fan when the attic temperature reaches a preset level usually 90 to 95 degrees f. So they equalize pretty quickly. After moisture penetration is controlled as best as possible the next approach to reducing attic moisture is by controlling air infiltration.

This will help to avoid premature damage to the shingles or mold building up in moist hot. How is an attic fan controlled. It helps to cool your home temperatures and the attic by approximately 30 degrees. In winter the humidistat operates the attic fan when the relative humidity exceeds a preset.

Unlike a ventilation fan a whole house fan an attic mounted fan that exhausts air from a home at night is designed to cool a house that is to lower the indoor temperature. Simply by sealing the various possible paths of air leakage already discussed infiltration will be reduced therefore restricting the movement of air and eliminating the stack effect. This ventilation process helps lower the attic air temperature and reduce humidity levels thus reducing the.