The volume is actually the capacity of the compressor in order to press the air over a unit of time and it is measured in CFM (Cubic Feet Minute) which is basically the same as PCM (Cubic Feet per Minute) or l/min (liters per minute). 1 CFM is the acronym for 1 ft³/min = 1 ft³/min. Correspondingly, in order to convert cubic feet per minute (ft³/min) to cubic meters per hour (m³/h), you will have to multiply it by: 1.699.

1. How to calculate CFM
for Commercial Kitchen
Exhaust Ventilation

2. INTRODUCTION
The volume is actually the capacity of the compressor in order
to press the air over a unit of time and it is measured in CFM
(Cubic Feet Minute) which is basically the same as PCM (Cubic
Feet per Minute) or l/min (liters per minute). 1 CFM is the
acronym for 1 ft³/min = 1 ft³/min. Correspondingly, in order to
convert cubic feet per minute (ft³/min) to cubic meters per
hour (m³/h), you will have to multiply it by: 1.699.
In order to define the perfect size Grease Range Hood System
to install, National Fire Code (NFC) imposes that your kitchen
hood should be 6 inches larger on all four sides as compared to
all of the kitchen equipment that is present under it. You can
always consult with your local Building Code Office to
understand if they require more extension or not.

3. How much CFM do I need
for my range hood?
On average, a range hood fan must move at a minimum of 100
CFM of air for about every 12 inches of the stove width. This
actually determines that in case you have a stove that is 30 inches
wide then you will need a range hood with a fan that rotates for
at least 250 CFM of air.
Other than these particular instructions that will be given to you
at different sections, you should always keep this thing in mind
that you should never use commas. For instance, you will have to
write 20000 and not 20,000. Feel free to always use decimal points
if required. All sections do not have to be filled, but within a
section fill in all the required information, otherwise, you are
going to get the wrong results.

4. Instructions for
calculating the
CFM
1.
Begin by measuring the dimensions of your kitchen.
Have an accurate length, width, and height of the area
that the kitchen hood will be installed. Define the
volume of air inside your commercial kitchen.
2.
Determine the number of BTUs which is produced by
your range and add 100CFM per 10,000 BTU’s.
Consequently, you will have to add 200 CFM to the
original chapel CFM number for a total of 360 CFM to be
accepted.
3.
Measure the length of the pipe so that the
exhaust hood will prevail over the old air.
Establish the exact length of the duct.

5. CFM Calculation Formula
CFM = area x Height ceiling x ACH / 60
This is another much easier example to
calculate the CFM of a kitchen hood: CFM is
equal to the area of the hood in (square feet)
multiplied by 90.
CFM= hood area x 90
How do you size a kitchen exhaust fan?
In order to find the fan that is needed for your size kitchen, multiply the number of cubic feet in the room by the
number of air exchanges (15), then divide it by the number of minutes in an hour that is (60).
How Many CFM Per Square
Foot?
0.13 CFM per square foot at ACH = 1.
0.27 CFM per square foot at ACH = 2.
0.40 CFM per square foot at ACH = 3.
0.53 CFM per square foot at ACH = 4.
0.67 CFM per square foot at ACH = 5

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