The cubic feet per minute rating is a measure of how much air the fan can exhaust from the kitchen in a minutes time.
Kitchen exhaust fan vent size. The duct size is directly proportional to the cfm rating. For bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room. Usha crisp air premia bv 150mm exhust fan. Crompton air buddy kitchen fan grey.
Sizing for large bathrooms. This page is designed to be a general guide for selecting an exhaust fan based on the size of the room and the type of application the fan will be used for. However if your kitchen exhaust vent is whining and sputtering it might be time to install a make up air unit. Usha crisp air 200mm exhaust fan.
When using smooth round 8 diameter metal pipe add one cfm per foot of pipe plus 25 cfm for each elbow and 40 cfm for a roof cap. Step 2 run the ducts. My kitchen exhaust fan is matched to the size of my kitchen. To calculate using this formula add up the required cfm ratings for all of the.
The distance from the exhaust above the stove to fan on the outside wall is 14 feet and there are 3 x 90 degree bends to get to the outer wall to vent. The fan is a powerful three speed model that has brilliant halogen bulbs that are built in to the fan. Your vent hood will have places available for either attic or wall exhaust. Havells ventilair dsp 230mm exhaust fan pista green digismart 6 inches high speed 1600 rpm 150 mm 100 pure copper motor axial fan ivory price 1 993 00.
Cover the hole that you are not using for exhaust and secure the hood to its final positioning to mark the location of the vent duct. The fan manufacturers have sizing charts that allow you to purchase the correct fan to match the size of your kitchen. All you need to do is select the application from the dropdown enter the size of the room and we will provide you with a general capacity range m3 hr that you should be looking to achieve from the extraction fan. The minimum allowed fan size is 50 cfm so if your bathroom is for example only 42 square feet you still need a 50 cfm fan.
Make up air guidelines for kitchen exhaust vents if you use your kitchen a lot at home it s vital to take a look at make up air system options to keep good air flowing as smoothly as possible. The duct for your exhaust fan needs to be run to the outside of the house to remove the chance of a fire hazard.