9
Air Flow Calculation
Per ASHRAE guidelines and other relevant guidelines, the feet coverage of each unit can be
calculated using the following example:
CFM = (Ceiling Height) x (Room Square Footage) x (ACH) x (1hr/60min)
As an example, if the unit is installed in a 35’ x 40’ room with 10’ ceilings, and the user would like
to achieve the minimum recommended 2 ACH, then the recommended CFM for the unit would be:
CFM = (10’) x (35’x40’) x (2ACH) x (1hr/60min) = 466CFM
NOTE: ASHRAE recommends a minimum of 2 ACH for re-opening schools, for example.
The following graph represents the feet coverage for each AstroPure
TM
unit considering four different
operational points:
Room Size Calculation (8ft Ceiling Height)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000
Air Changes Per Hour (ACH)
Room Area (ft
2
)
Room Area X Air Changes Per Hour (1 AstroPure
™
Unit)
1000 CFM
800 CFM
500 CFM
400 CFM
ASHRAE/REHVA
(1,2)
Recommendation for
Healthcare (>12 ACH)
ASHRAE
(3)
Minimum
Recommendation for
Schools (>2 ACH)
REHVA
(2)
Recommendation
(2-5 ACH)
QUICK START GUIDE & OPERATION (CONT’D)
