400 Cfm Range Hood Duct Size

Minimum duct size of 6 recommended duct size of 8.

400 cfm range hood duct size. Range hood duct length. When you ve used a round 8 inches diameter smooth metal pipe just add one cfm per foot of this pipe and 30 cfm for every elbow and 55 cfm for a roof cap. Minimum duct size of 4 recommended duct size of 6. If your hood is between 401 and 600 cfm you need a minimum duct size of 6.

View the kitchen exhaust duct sizing chart below to determine your ductwork diameter based on range hood cfm. For more information on duct size click here. The first guideline for sizing a range hood depends on the output of your range as measured in british thermal units btus. The minimum recommended duct size is 6 for 0 400 cfm range hoods.

What is the minimum duct size for a range hood. The smaller the duct size the less cfm you need and the larger the duct size the more cfm you need. If your hood is between 901 and 1200 cfm then you should go for a minimum duct size of 8 and if you have a 1200 cfm hood consider going for a minimum duct size of 10. Minimum duct size of 7 recommended duct size of 8 10.

If your hood is between 601 and 900 cfm you need a minimum duct size of 7. The shape size turns length and cap on the vent hood ductwork adds some resistance which reduces the amount of air a range hood fan can remove requiring additional cfm for the fan. If you have a range hood with a cfm of 0 400 you will need a minimum duct size of 4. In the examples used above if your kitchen has a 30 stove 250 cfm minimum in a 16 x 16 x 8 room 512 cfm minimum and a 40 000 btu gas stove 400 cfm minimum you would want a fan rated at 512 cfm or higher plus 100 cfm for the ductwork for a total of 612 cfm or more.

Size your range hood based on the heat output of your range. Take note of the size and position of your kitchen range hood.