How Much Roof Venting For 6000 Cfm House Fan

A minimum of one square foot of inlet area for every 300 cfm of hvi certified fan capacity is required for proper fan operation.

How much roof venting for 6000 cfm house fan. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. Take the total cubic feet per minute of air flow cfm of the fan and divide by 750 2. Understanding whole house fan cfm. The higher the cfm the more venting area is required to keep the system working efficiently.

This will give you the amount of net free venting in square feet required for the fan you select. A rule of thumb is you should have one square foot of net free venting area for every 500 cfm of airflow. To calculate the total minimum soffit vent intake area in square inches divide the cfm of the pav by 300 and multiply the result by 144. Add an additional 20 cfm x 1 20 if you have a steep roof and 15 cfm x 1 15 for a dark roof.

Whole house fans come in a variety of sizes determined by the amount of air they circulate or whole house fan cfm. The two main dangers associated with too much ventilation involve roof damage and increased utility bills. The 537 cfm fan is capable of moving plenty of air. Building codes typically echo the administration s guidelines.

To simplify this you can only bring in as much as you can take out. A wind turbine catches the wind and spins a fan which pulls hot air outside. If you divide that by 750 you get the number 6 32. So at 3000 cfm you ll want six square feet of venting.

Whole house and attic fans are also capable of pulling carbon monoxide back into the home through a damaged flue. Cubic feet per minute or cfm is the amount of cubic feet of air per minute the fan moves. Having an understanding of this makes choosing the correct fan size for your home an easier process. Use only soffit vents as fresh air intakes for powered attic ventilators.

This is important because air like water takes the path of least resistance. Here is an example. Dangers of too much ventilation. Determine how much net free venting your fan will require.

With a power switch or a thermostat installation an attic fan can be turned on to let hot air from the attic out. Attic x 0 7 700 cfm minimum fan rating. The federal housing administration recommends 1 square foot of attic ventilation for every 150 square feet of attic space.