Attic Moisture Fan

The whole house fan is installed inside the attic between the living space and ceiling.

Attic moisture fan. A powered attic ventilator has a different purpose. The whole house fan and the attic venting fan. It helps to cool your home temperatures and the attic by approximately 30 degrees. How is an attic fan controlled.

In winter the humidistat operates the attic fan when the relative humidity exceeds a preset. This ventilation process helps lower the attic air temperature and reduce humidity levels thus reducing the. An attic fan changes the air regularly so moisture doesn t get a chance to settle and do damage. The normal indoor humidity range in winter should be 15.

In summer the thermostat operates the fan when the attic temperature reaches a preset level usually 90 to 95 degrees f. Humidity settings are another issue that can make or break the performance of your heating and cooling systems and your attic ventilation. An attic fan works by exchanging the hot air in your attic space for fresh air pulled through the vents. The warm air escapes through the attic and to the attic vents allowing the circulation of chilly air from the windows.

If you raise the attic temperature the rh in both places would be the same. The ideal way to control the operation of an attic fan is with a thermostat and a humidistat. Two main types of attic fan there are two devices commonly called attic fans. It is designed to lower the temperature of an attic by exhausting air from the attic and replacing attic air.

An attic fan pulls hot air out of the space and draws in cooler air from outside. So they equalize pretty quickly. This will help to avoid premature damage to the shingles or mold building up in moist hot. The difference in the two spaces is the dry bulb 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. 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. 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.