How many windows should be open with a whole house fan?

What happens if you run a whole house fan with the windows closed?

Without proper ventilation, powerful whole-house fans can create a backdraft in your furnace or water heater, potentially causing carbon monoxide to be pulled into your rooms. Operating the fan without open windows may also cause the fan to overheat. Never operate the fan at the same time you are using the fireplace.

How much ventilation does a whole house fan need?

Installing and Using a Whole House Fan Attic ventilation will usually need to be increased to exhaust the fan's air outdoors. You'll need 2 to 4 times the normal area of attic vents, or about one square foot of net free area for every 750 cubic feet per minute of fan capacity.

How do you cool a house with a whole house fan?

How To Use Your Whole House Fan

  1. 1 Open a few windows 4-6 inches.
  2. 2 Turn on your whole house fan using the switch or portable remote and timer.
  3. 3 Feel the nice, cool breeze as air passes through to the attic and fresh air replaces stale, trapped air.
  4. 4 Experience complete indoor air exchanges in your home every 3-4 minutes.

Can you run attic fan with windows closed?

Can You Run An Attic Fan With Windows Closed? You can run an attic fan with your attic and house windows closed if you so choose. However, if you do, you'll want to make sure that the soffit vents in your attic and the vents in the rest of your home are open.

Can you put a whole house fan in a window?

WHOLE-HOUSE FAN CAN BE INSTALLED IN WALL, WINDOW OR ATTIC. … The key to effective operation is picking a location where air can circulate freely to the fan, which works by pulling cool air into the house through partly open windows and exhausting hot air to the outside.

Does a whole house fan need to be vented?

A whole house fan is designed to move air from your house into your attic. … However, without enough venting area, pressure can build up, slowing down airflow and reducing efficiency, potentially pushing hot attic air back into your living space. Airflow is measured in Cubic Feet per Minute (CFM).

Can you run a whole house fan with the AC on?

Essentially, you can use your AC unit and your whole house fan together. However, if the air outdoors is cooler than the air indoors, it doesn't make a whole lot of sense to turn your air conditioning system on. … Using a whole house fan reduces the need for air conditioning.

Should windows be open when using a fan?

While leaving the windows open while the air conditioner runs would be an obvious waste of money, it is OK to open the windows to allow outside air in and run AC fans. … Using the fan can help draw in fresh, cool air from an open window and force out stale, stagnant air that has gathered in other areas of the home.


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