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 biologicalcontrols.com - Air Change Chart
 

     How to use charts:

      1.) Calculate Square Footage of Room          

      2.) Find closest square footage in column 1, chart 1

      3.) Determine the closest ceiling height

      4.) Refer to Chart 2
 
 

Chart 1

            
Calculate Room Volume (cubic feet)
SQ. FT of            
Floor Space 7' Ceiling 8' Ceiling 9' Ceiling 10' Ceiling 11' Ceiling 12' Ceiling
             
40 280 320 360 400 440 480
50 350 400 450 500 550 600
60 420 480 540 600 660 720
70 490 560 630 700 770 840
80 560 640 720 800 880 960
90 630 720 810 900 990 1080
100 700 800 900 1000 1100 1200
110 770 880 990 1100 1200 1320
120 840 960 1080 1200 1320 1440
130 910 1040 1170 1300 1430 1560
140 980 1120 1260 1400 1540 1680
150 1050 1200 1350 1500 1650 1800
160 1120 1280 1440 1600 1760 1920
170 1190 1360 1530 1700 1870 2040
180 1260 1440 1620 1800 1980 2160
190 1330 1520 1710 1900 2090 2280
200 1400 1600 1800 2000 2200 2400
210 1470 1680 1890 2100 2310 2520
220 1540 1760 1980 2200 2420 2640
230 1610 1840 2070 2300 2530 2760
240 1680 1920 2160 2400 2640 2880
250 1750 2000 2250 2500 2750 3000
260 1820 2080 2340 2600 2860 3120
270 1890 2160 2430 2700 2970 3240
280 1960 2240 2520 2800 3080 3380
290 2030 2320 2610 2900 3190 3480
300 2100 2400 2700 3000 3300 3600
310 2170 2480 2790 3100 3410 3720
320 2240 2560 2880 3200 3520 3840
330 2310 2640 2970 3300 3630 3960
340 2380 2720 3060 3400 3740 4080
350 2450 2800 3150 3500 3850 4200
360 2520 2880 3240 3600 3960 4320
370 2590 2960 3330 3700 4070 4440
380 2660 3040 3420 3800 4180 4560
390 2730 3120 3510 3900 4290 4680
400 2800 3200 3600 4000 4400 4800
410 2870 3280 3690 4100 4510 4920
420 2940 3360 3780 4200 4620 5040
430 3010 3440 3870 4300 4730  
440 3080 3520 3960 4400 4840  
450 3150 3600 4050 4500 4950  
460 3220 3680 4140 4600 5060  
470 3290 3760 4230 4700    
480 3360 3840 4320 4800    
490 3430 3920 4410 4900    
500 3500 4000 4500 5000    
510 3570 4080 4590      
520 3640 4160 4680      
530 3710 4240 4770      
540 3780 4320 4860      
550 3850 4400 4950      
560 3920 4480 5040      
570 3990 4560        
580 4060 4640        
590 4130 4720        
             
             

      5.) Find your cubic feet of space in column 1, Chart 2

      6.) By determining your speed setting, this chart indicated the number of air changes per hour
             
             

Chart 2

            
Calculates Air Changes Per Hour (ACH) based on Room Volume
Cubic FT. Of            
Floor Space At 150 CFM At 300 CFM At 400 CFM At 500 CFM At 600 CFM At 700 CFM
             
400 22.50 45.00 60.00 75.00 90.00 105.00
500 18.00 36.00 48.00 60.00 72.00 84.00
600 15.00 30.00 40.00 50.00 60.00 70.00
700 12.86 25.71 34.29 42.85 51.43 60.00
800 11.25 22.50 30.00 37.50 45.00 52.50
900 10.00 20.00 26.67 33.33 40.00 46.67
1000 9.00 18.00 24.00 30.00 36.00 42.00
1100 8.18 16.36 21.82 27.27 32.73 38.18
1200 7.50 15.00 20.00 25.00 30.00 35.00
1300 6.92 13.85 18.46 23.08 27.68 32.31
1400 6.43 12.86 17.14 21.43 25.71 30.00
1500 6.00 12.00 16.00 20.00 24.00 28.00
1600   11.25 15.00 18.75 22.50 26.25
1700   10.59 14.12 17.65 21.18 24.71
1800   10.00 13.33 16.67 20.00 23.33
1900   9.47 12.63 15.79 18.95 22.11
2000   9.00 12.00 15.00 18.00 21.00
2100   8.57 11.43 14.29 17.14 20.00
2200   8.18 10.91 13.64 16.36 19.09
2300   7.83 10.43 13.04 15.65 18.26
2400   7.50 10.00 12.50 15.00 17.50
2500   7.20 9.60 12.00 14.40 16.80
2600   6.92 9.23 11.54 13.85 16.15
2700   6.67 8.89 11.11 13.33 15.56
2800   6.43 8.57 10.71 12.86 15.00
2900   6.21 8.28 10.34 12.41 14.48
3000   6.00 8.00 10.00 12.00 14.00
3100     7.74 9.68 11.61 13.55
3200     7.50 9.38 11.25 13.13
3300     7.27 9.09 10.91 12.73
3400     7.06 8.82 10.59 12.35
3500     6.86 8.57 10.29 12.00
3600     6.67 8.33 10.00 11.67
3700     6.49 8.11 9.73 11.35
3800     6.32 7.89 9.47 11.05
3900     6.15 7.69 9.23 10.77
4000     6.00 7.50 9.00 10.50
4100       7.32 8.78 10.24
4200       7.14 8.57 10.00
4300       6.98 8.37 9.77
4400       6.82 8.18 9.55
4500       6.67 8.00 9.33
4600       6.52 7.83 9.13
4700       6.38 7.66 8.94
4800       6.25 7.50 8.75
4900       6.12 7.35 8.57
5000       6.00 7.20 8.40
             
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