What CFM Do I Need For A Whole House Fan? - Fixanswer

Determine the home’s cubic measurement by multiplying the square footage by ceiling height: 2200 square foot home x 8 inch ceiling height = 17600 cubic feet.
Divide the cubic feet measurement by the CFM rating assigned to the fan: 17600 cubic feet ÷ 1600 = 11.

How do you size a whole house fan?

Determine the home’s cubic measurement by multiplying the square footage by ceiling height: 2200 square foot home x 8 inch ceiling height = 17600 cubic feet.
Divide the cubic feet measurement by the CFM rating assigned to the fan: 17600 cubic feet ÷ 1600 = 11.

How many CFM do I need for 1000 square feet?

Total area of home (square feet) Continuous ventilation rate	1,000 square feet 50 CFM	2,000 square feet 100 CFM	3,000 square feet 150 CFM

How long is a whole house fan?

Part 2 On average you should run the fan for 4-5 hours to ensure the attic is cooled. The attic is what keeps the home hot. We always recommend the use of a timer. Keep in mind that our systems will provide you with a whole house ventilation fan that can be used to exhaust cooking odor, stale indoor air, etc.

Can whole house fan be too big?

You need a minimum of 1 square foot of attic air venting for each 750 CFM of air flow. ... A 24-inch fan will move 4,500 CFM. In general, there’s no harm in buying a whole-house fan slightly larger than the minimum CFM you need .

Does a whole house fan need a dedicated circuit?

You only need an individual branch circuit (what’s called “dedicated” in the trade) in specific scenarios. Kitchens and similar areas need a small appliance outlet dedication.

How much does a whole house fan cost?

The average cost of a whole house fan ranges between an average of $845 to $1627 . This includes materials, labor, and the fan unit itself. This range is for the average unit type, rated at 5700 CFM: a measure of how much air the fan displaces.

How many CFM should a fan have?

Good CFM ranges from 4,000 to 5,000 . Better ranges from 5,000 to 6,000. Best is over 6,000.

What’s the difference between an attic fan and a whole house fan?

Attic fans are quite different. They’re installed up on a roof or through an exterior wall up in an attic. ... Whole-house fans need windows and doors open and attic fans need lots of soffit vents to suck cooler outdoor air up into the hot attic. Without this open space, the fans will not move much air.

How many CFM do I need for a 12×12 room?

One cfm per square foot (1 cfm / square foot) of floor area is required. This is the average amount of air needed for a room or an entire building.

How many CFM do I need for 200 square feet?

Step 1: Calculate Bathroom Size: 20′ x 10′ Bathroom = 200 square feet. Result: You will need a 150 CFM fan for this bathroom.

How do I calculate CFM for my house?

Measure the room’s width and length. ...
Multiply the three measurements from step 1 to determine the cubic footage of the room. ...
Multiply the cubic volume of the room by the number of times you want the air to turn over or exchange in an hour.

Can I leave my whole house fan on all night?

Actually, it is recommended to run a whole house exhaust fans overnight . This way, you are cooling more than just the air, you are reducing the temperature of your home’s entire structure. ... It can take some time to pull the heat out of your home’s structure along with the contents of a house.

Can I run my whole house fan all night?

Getting the most from your AirScape

Only use your fan when the outdoor air is cooler than your indoor air. Make sure your A/C is off when you run the fan to avoid wasting energy. We recommend running the whole house fan all night . The goal is to cool your entire house down, not just the air.

When should you run a whole house fan?

For best results, run your whole house fan for at least 10 minutes first thing in the morning to bring a cool breeze through the house and into the attic. This will expel any hot stale air buildup from the night before. Then, close windows, doors and the blinds on the sunny side of your home.