Fan CFM Calculator

This fan calculator is typically used to calculate the CFM or cubic feet per minute of air exchange that may be desired in a building. Whether exhausting air or bringing fresh air into a structure, the calculation produced should help to figure out the size of fan(s) required to accomplish the air exchanges needed.

PLEASE NOTE: If you are not sure what kind of CFM's may be needed for your type of facility, please refer to the Commercial & Industrial Applications chart below:

If you have any questions regarding CFM's, air exchanges needed, the calculator, or which exhaust and or supply fans may be right for your building, please call us at 866.727.1060

Length of Area (feet)
Width of Area (feet)
Height of Area (feet)
Frequency of Desired Air Exchange (in minutes)
 
CFM's Required For Desired Air Exchange

 EXHAUST & AIR INTAKE VENTILATION GUIDE BASED ON 0" STATIC PRESSURE

CFM = Room Volume / Minutes Per Air Exchange  |  Room Volume = L x W x H (room dimensions)
Minute Air Exchange Chart For Commercial and Industrial Applications
--
TYPICAL
RANGE
Assembly
(6)
2-10
Auditoriums
(6)
1-20
Bakeries
(2)
1-3
Banks
(6)
3-10
Bars
(4)
2-5
Barns
(15)
10-20
Boiler Rooms
(2)
1-3
Bowling Alley
(3)
1-5
Cafeteria
(4)
3-5
Churches
(6)
2-10
Classrooms
(6)
4-8
Compressor Rooms
(2)
1-3
Dance Halls
(6)
2-10
Dairies
(4)
2-5
Dormitories
(6)
4-8
Dry Cleaning Plant
(3)
1-5
--
TYPICAL
RANGE
Engine Rooms
(3)
1-5
Factories
(7)
4-10
Foundries
(5)
2-8
Garages
(7)
4-10
Generating Plants
(4)
2-5
Glass Plants
(2)
1-3
Gymnasiums
(6)
2-10
Hallways
(8)
4-12
Kitchens (Comm.)
(3)
1-5
Laboratories
(3)
1-5
Libraries
(4)
2-5
Laundries
(2)
1-3
Locker Rooms
(6)
2-10
Machine Shops
(4)
2-5
Markets
(6)
2-10
Mills
(4)
2-5
--
TYPICAL
RANGE
Packing Houses
(4)
3-5
Plants
(7)
4-10
Plating Plants
(4)
2-5
Print Shops
(7)
4-10
Restaurants
(6)
2-10
Rest Rooms
(7)
4-10
Schools
(7)
4-10
Spray/Paint booth
(1)
1-2
Stores
(7)
4-10
Theaters
(6)
4-8
Transformer Rooms
(3)
1-5
Turbine Rooms
(4)
2-5
Waiting Rooms
(12)
10-15
Warehouses
(7)
4-10
Welding Rooms
(3)
1-4
--
--
--