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Look for links to printable pdf
literature in equipment specifications sections, above in this column, & on
site map.
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AIR CLEANER SIZING
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HOW TO
DETERMINE THE NUMBER OF AIR CLEANERS REQUIRED
Measure the size of
the room in feet and use these numbers in the following formula:
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Required
number of Air Cleaners =
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L x W x H x ACH |
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CFM x 60 |
Where:
L,W,H are the room length, width, & ceiling height in units of feet
ACH is the recommended Air Changes per Hour from Table 1 below.
CFM is the air cleaner delivered Cubic Feet per Minute of clean air from Table 2
below.
Table 1: Recommended Air Changes per Hour (ACH)
|
Load |
Application |
ACH |
|
Light |
general offices
computer rooms |
4-5 |
|
Average |
conference rooms
break rooms
designated smoking areas |
6 |
|
Heavy |
bingo halls
extra smokey areas |
8-10 |
Use the CFM
from Table 2 for the speed that the air cleaner will operate on normally,
i.e., low speed for quiet applications, high speed for more air cleaning.
Table 2:
Commercial Air Cleaner
Delivered CFM
(operating on 60 Hz
electric*)
For more portable air cleaners -
Click Here
|
Model |
Low |
Medium |
High |
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PM-400UV |
infinitely variable up to 400 |
|
X-400 |
175 |
275 |
400 |
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P-600XL |
235 |
285 |
430 |
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CM-11 |
400 |
700 |
850 |
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CM-12 |
380 |
630 |
860 |
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X-11Q |
500 |
700 |
1,100 |
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C-12 |
800 |
1,050 |
1,250 |
* Models operating on 50 Hz
electric will run about 15% slower. Therefore, the figures in this
table should be reduced by 15% for 50 Hz operation.
** Models PM400 and P600XL are located under the portable air cleaner
section of this website.
| IMPORTANT
WARNING:
Delivered CFM is the rate of air flow through the air cleaner with all
filters installed. Beware, some manufacturers cite 'free flow' CFM or
CFM '@0"wg', which refer to the performance of the motor and blower
combination only, without any air resistance due to the filters. The
CFM values published on this website represent delivered CFM. When
dealing with other vendors, if in doubt, ask! |
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HOW TO DETERMINE AIR CHANGES PER HOUR (ACH)
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Air Changes
per Hour = |
Total CFM
Supplied by Air Cleaners x 60 Minutes |
|
L x W x H |
Where:
CFM is the total delivered Cubic Feet per Minute
for all air cleaners in use
L, W, H are length, width, & ceiling height of room in
units of feet
Also view a sizing
table by clicking here
Click Here for more
information
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