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Air Cleaner Capcaities and Sizing
Room Air Cleaner Capacities and Sizing
Determine the size of your
room by measuring how wide and how long it is. Multiply the width x length and
this is the total square feet of the room space. To
find the volume of the room, multiply the floor space by the room height. To
compare room volume to air cleaner capacities, determine the number of air
changes per hour (ACH) you desire. Indoor air quality professionals and
Allergists recommend at least 2 room air changes per hour, designated as
2 ACH. Spaces with high pollutants may require higher air
changes to reduce pollutant levels.
To determine how much air
must be moved through the air cleaner to provide 2 ACH, you take the total
volume of the room and multiply by 2. Air cleaners provide air flow performance
in cubic feet per minute, so you must take your total volume of air for 2 ACH
and divide by 60 minutes to get a value for cubic feet per minute (CFM).
Note:
The
location of an air cleaner in a room can effect performance. Try to place the
unit in a central location that allows the greatest degree of unobstructed air
flow around the air cleaner.
Air Cleaner Sizing Example
- Room Size
- 12' x 20' = 240 square feet
of floor space (sq. ft.).
- Ceiling Height is 8'
- 240 sq.ft. x 8' = 1920
cubic feet of air volume (cu. ft.).
- Two Room Air Changes per Hour
- 1920 cu. ft. x 2 = 3840
cu. ft. per hour (60 minutes).
- Volume per Minute
- 3840 ÷ 60 = 64 cubic
feet per minute (cfm).
In the previous example, an
air cleaner must provide a system flow rate of 64 cubic feet per minute of
filtered air to clean all the air in a room two times per hour.
Note:
Some air cleaner
manufacturers provide air flow performance ratings when the fan and motor are
under no load or not in the system. Air cleaner system air flow rates can diminish
up to 60% of the no load air volume when the filter media is installed due to
the resistance to the air flow through the filter media. Please consider this
air flow rate reduction when sizing air cleaners with untested system air flow
rates.
- Room Size and Flow Rate
Requirement Chart
- (based on 8' ceiling height)
|
Room
Size |
Air Cleaner Flow Rate to
Achieve 2 ACH* |
Air Cleaner Flow Rate to
Achieve 3 ACH* |
Air Cleaner Flow Rate to
Achieve 4 ACH* |
| 75 sq. ft. |
20 cfm |
30 cfm |
40 cfm |
| 100 sq. ft. |
27 cfm |
40 cfm |
53 cfm |
| 125 sq. ft. |
33 cfm |
50 cfm |
67 cfm |
| 150 sq. ft. |
40 cfm |
60 cfm |
80 cfm |
| 175 sq. ft. |
47 cfm |
70 cfm |
93 cfm |
| 200 sq. ft. |
53 cfm |
80 cfm |
107 cfm |
| 225 sq. ft. |
60 cfm |
90 cfm |
120 cfm |
| 250 sq. ft. |
67 cfm |
100
cfm |
133 cfm |
| 275 sq. ft. |
73 cfm |
110
cfm |
147 cfm |
| 300 sq. ft. |
80 cfm |
120
cfm |
160 cfm |
| 325 sq. ft. |
87 cfm |
130
cfm |
173 cfm |
| 350 sq. ft. |
93 cfm |
140
cfm |
187 cfm |
| 375 sq. ft. |
100 cfm |
150
cfm |
200 cfm |
| 400 sq. ft. |
107 cfm |
160
cfm |
213 cfm |
| 425
sq. ft. |
113 cfm |
170
cfm |
227 cfm |
| 450
sq. ft. |
120 cfm |
180
cfm |
240 cfm |
| 475
sq. ft. |
127 cfm |
190
cfm |
253 cfm |
| 500
sq. ft. |
133 cfm |
200
cfm |
267 cfm |
| 525
sq. ft. |
140 cfm |
210
cfm |
280 cfm |
| 550
sq. ft. |
147 cfm |
220
cfm |
293 cfm |
| 575
sq. ft. |
153 cfm |
230
cfm |
|
| 600
sq. ft. |
160 cfm |
240
cfm |
|
| 625
sq. ft. |
167 cfm |
250
cfm |
|
| 650 sq. ft. |
173 cfm |
260 cfm |
|
| 675 sq. ft. |
180 cfm |
270 cfm |
|
| 700 sq. ft. |
187 cfm |
280 cfm |
|
| 725 sq. ft. |
193 cfm |
290 cfm |
|
| 750 sq. ft. |
200 cfm |
300 cfm |
|
| 775 sq. ft. |
207 cfm |
|
|
| 800 sq. ft. |
213 cfm |
|
|
| 825 sq. ft. |
220 cfm |
|
|
| 850 sq. ft. |
227 cfm |
|
|
| 875 sq. ft. |
233 cfm |
|
|
| 900 sq. ft. |
240 cfm |
|
|
| 925 sq. ft. |
247 cfm |
|
|
| 950 sq. ft. |
253 cfm |
|
|
| 975 sq. ft. |
260 cfm |
|
|
| 1000 sq. ft. |
267 cfm |
|
|
| 1025 sq. ft. |
273 cfm |
|
|
| 1050 sq. ft. |
280 cfm |
|
|
| 1075 sq. ft. |
287 cfm |
|
|
| 1100 sq. ft. |
293 cfm |
|
|
| 1125 sq. ft. |
300 cfm |
|
|
*ACH
= Air Changes per Hour. A term to represent how many times all the air in a room
could pass through an air cleaner in an hour.
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