Over the range microwave ducting information duct installation guidelines.
Range vent duct size.
The smaller the duct size the less cfm you need and the larger the duct size the more cfm you need.
I am an hvac designer but this is a question about an installation i am doing in my own house.
Here is a breakdown of the duct size you need based on your range hood s cfm.
The minimum recommended duct size is 6 for 0 400 cfm range hoods.
Minimum duct size of 8 recommended duct size of 10 12 1200 cfm.
My duct sizer tells me that would require a 10 5 duct.
For more information on duct size click here.
A 0 to 400 cfm fan requires a 4 inch minimum duct size but a 6 inch duct is recommended.
If your hood is between 401 and 600 cfm you need a minimum duct size of 6.
Hood range duct size.
Duct size for vent hood.
If your hood is between 601 and 900 cfm you need a minimum duct size of 7.
Minimum 10 diameter duct recommended duct size of 12 after you consider the size of your duct the next most important factor is the length.
Duct system sizes and airflow quick chart created date.
I m putting in a kitchen exhaust hood that is 480 cfm with a 6 round duct connection.
I ve never designed a kitchen exhaust system before but my understanding was that for bathroom exhaust you want to size the duct for 0 1 of head loss.
The range will have a 24 inch hood that will be connected to an inline exhaust fan rated at 140 cfm which will run through the ceiling joist for about 10 feet.
The minimum duct sizes and recommended duct sizes based on a hood fan s cfm rating are as follows.
If you have a range hood with a cfm of 0 400 you will need a minimum duct size of 4.