Attic Fan Blow In Or Out

If you have only one box fan turn the fan in or out of the window in accordance with the outside temperature.

Attic fan blow in or out. Gable fans fit into the gable vent and can be set to operate only within a preset temperature range. If you have an odd number configure the extra one to pull air in. Many are solar powered and require no other wiring so they don t cause any additional charges on your electricity bill. Attic ventilation fans also tend to be quite energy efficient in terms of their own operation.

Likewise when you install an exhaust fan in the room you need make up air in order for it to bring in fresh air. That creates a. Strong attic fans can actually back draft furnaces or water heaters by pulling combustion gases out of their burners and into the home. In order to have fresh air blow into the room you need a way for stale air to blow out of the room.

Set them both to draw air out. These fans are commonly mounted in an upstairs stairwell or hallway ceiling where there s at least 3 ft. Trying to solve the heat gain problem in your attic by using a fan is like lying out at the beach with a fan blowing over you and thinking you re not going to get a sunburn. If there are not enough soffit gable or ridge vents a powerful attic exhaust fan can pull the air from your home through the ceiling if it is not perfectly sealed off.

This sends hot air up and out cooling your house and your attic. Like most floridians in post hurricane bldg. The air source will come from the eaves of the roof. The more window fans you have working the better.

We have 14 ceilings and ceiling fans that run 24 x 7. In order for the exhaust fan to work you d need to open a window too. Much of that heat then conducts downward and finds its way into the house. Using a fan to blow hot air out of the attic doesn t address the radiant heat flow from the roof to the attic floor.

Aim to set up an equal number of in and out blowing fans. Code homes my home is concrete block with a couple of blow out wood walls 100 vented soffits large hurricane roof vents and 13 16 of blown insulation. Even if your roof already has ridge vents and plenty of ventilation built in it s a good idea to install gable fans or roof fans to help blow hot humid air out of the attic. If you set one to push air in you ll be pushing all kinds of dust dirt and insects into the attic space.

If the temperature outside is cooler than the temperature inside the room face the fan in the window so that it blows air in which can usually be done at night and in the early morning when the air outside is normally cooler.