Table 
20 through 75 Ton Component Static Pressure Drops (Inches W.C.)
  | 
  | Evaporator Coil  | 
  | 
  | Heating System  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | Filters  | 
  | 
  | 
  | 
  | Econ.  | 
  | ||||||||
  | CFM  | 
  | 
  | High  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | Throwaway Perm  | Bag  | Cartridge  | 
  | Std  | With Or  | |||||
Nom  | STD  | Std.  | Capacity  | SFHF/G  | SEHF/G  | SLHF/G  | 
  | SSHF/G  | Std. High  | Wire  | And  | And  | 
  | 
  | Roof Without  | |||||||||||||
Tons  | AIR | Wet Dry  | Wet  | Dry  | Low High  | All KW's  | Low High  | 
  | 
  | Low High  | 
  | Fiber Effic. Mesh Prefilter Prefilter  | Curb Exh. Fan  | |||||||||||||||
  | 4,000  | .07  | .05  | .14  | .10  | .02  | N/A  | .02  | 
  | .05  | .06  | 
  | .02  | .06  | 
  | 
  | .03  | .03  | .01  | .3  | .24  | 
  | 
  | .01  | .03  | 
  | ||
  | 6,000  | .13  | .10  | .27  | .20  | .05  | .05  | .04  | 
  | .09  | .12  | 
  | .05  | .12  | 
  | 
  | .06  | .06  | .02  | .5  | .44  | 
  | 
  | .02  | .06  | 
  | ||
20  | 8,000  | .21  | .16  | .43  | .32  | .09  | .09  | .07  | 
  | .15  | .19  | 
  | .10  | .20  | 
  | 
  | .09  | .09  | .03  | .71  | .68  | 
  | 
  | .05  | .12  | 
  | ||
  | 9,000  | .26  | .20  | .52  | .39  | .12  | .12  | .09  | 
  | .19  | .24  | 
  | .12  | .22  | 
  | 
  | .11  | .11  | .04  | .83  | .81  | 
  | 
  | .07  | .15  | 
  | ||
  | 10,000  | .31  | .23  | .61  | .46  | .14  | .15  | .11  | 
  | .23  | .28  | 
  | .15  | .29  | 
  | 
  | .13  | .13  | .05  | .95  | .95  | 
  | 
  | .10  | .19  | 
  | ||
  | 12,000  | .41  | .31  | .82  | .63  | .20  | .22  | .17  | 
  | .33  | .40  | 
  | .22  | .42  | 
  | 
  | .15  | .15  | .06  | 1.19  | 1.26  | 
  | 
  | .14  | .27  | 
  | ||
  | 5,000  | .10  | .07  | .20  | .15  | .03  | N/A  | .03  | 
  | .07  | .09  | 
  | .04  | .09  | 
  | 
  | .05  | .05  | .02  | .40  | .34  | 
  | 
  | .01  | .03  | 
  | ||
  | 6,000  | .13  | .10  | .27  | .20  | .50  | 
  | .44  | 
  | 
  | 
  | 
  | 
  | |||||||||||||||
  | 7,500  | .19  | .15  | .39  | .29  | .08  | .08  | .06  | 
  | .14  | .17  | 
  | .09  | .18  | 
  | 
  | .09  | .09  | .03  | .66  | .62  | 
  | 
  | .04  | .10  | 
  | ||
25  | 10,000  | .31  | .23  | .61  | .46  | .14  | .15  | .11  | 
  | .23  | .28  | 
  | .15  | .29  | 
  | 
  | .13  | .13  | .05  | .95  | .95  | 
  | 
  | .10  | .19  | 
  | ||
  | 11,000  | .36  | .27  | .71  | .54  | .17  | .18  | .13  | 
  | .29  | .33  | 
  | .19  | .35  | 
  | 
  | .15  | .15  | .06  | 1.06  | 1.11  | 
  | 
  | .12  | .23  | 
  | ||
  | 12,500  | .44  | .34  | .87  | .67  | .22  | .23  | .18  | 
  | .33  | .42  | 
  | .24  | .42  | 
  | 
  | .19  | .19  | .08  | 1.29  | 1.34  | 
  | 
  | .19  | .30  | 
  | ||
  | 14,000  | .52  | .40  | 1.05  | .81  | .28  | .29  | .21  | 
  | .41  | .53  | 
  | .30  | .53  | 
  | 
  | .24  | .24  | .10  | .24  | 
  | .39  | 
  | |||||
  | 6,000  | .15  | .11  | .20  | .15  | .05  | .05  | .04  | 
  | .09  | .12  | 
  | .05  | .12  | 
  | 
  | .04  | .04  | .01  | .34  | .26  | 
  | 
  | .02  | .06  | 
  | ||
  | 9,000  | .29  | .22  | .39  | .29  | .11  | .12  | .09  | 
  | .19  | .24  | 
  | .12  | .22  | 
  | 
  | .07  | .17  | .02  | .54  | .48  | 
  | 
  | .07  | .15  | 
  | ||
30  | 12,000  | .46  | .35  | .61  | .46  | .20  | .21  | .16  | 
  | .31  | .39  | 
  | .22  | .41  | 
  | 
  | .11  | .11  | .04  | .75  | .75  | 
  | 
  | .16  | .27  | 
  | ||
  | 14,000  | .59  | .45  | .78  | .60  | .26  | .29  | .22  | 
  | .40  | .51  | 
  | .30  | .50  | 
  | 
  | .14  | .14  | .06  | .95  | .95  | 
  | 
  | .25  | .39  | 
  | ||
  | 15,000  | .65  | .50  | .87  | .67  | .30  | .33  | .25  | 
  | .45  | .57  | 
  | .33  | .52  | 
  | 
  | .16  | .16  | .07  | 1.03  | 1.06  | 
  | 
  | .30  | .43  | 
  | ||
  | 17,000  | .80  | .62  | 1.06  | .82  | .39  | .42  | .35  | 
  | .58  | .73  | 
  | .42  | .67  | 
  | 
  | .21  | .21  | .09  | 1.20  | 1.30  | 
  | 
  | .39  | .59  | 
  | ||
  | 8,000  | .10  | .07  | .20  | .15  | .09  | N/A  | .07  | 
  | .09  | .11  | 
  | .05  | .11  | 
  | 
  | .04  | .04  | .02  | .37  | .31  | 
  | 
  | .01  | .03  | 
  | ||
  | 10,000  | .14  | .11  | .29  | .21  | 
  | .49  | 
  | .43  | 
  | 
  | 
  | 
  | 
  | ||||||||||||||
  | 12,000  | .19  | .14  | .39  | .29  | .20  | .15  | .16  | 
  | .17  | .22  | 
  | .11  | .21  | 
  | 
  | .08  | .08  | .03  | .61  | .56  | 
  | 
  | .04  | .07  | 
  | ||
40  | 16,000  | .31  | .23  | .61  | .46  | .34  | .26  | .29  | 
  | .28  | .36  | 
  | .20  | .36  | 
  | 
  | .12  | .12  | .05  | .88  | .87  | 
  | 
  | .10  | .09  | 
  | ||
  | 17,000  | .34  | .26  | .67  | .51  | N/A  | .29  | .32  | 
  | .31  | .39  | 
  | .22  | .41  | 
  | 
  | .13  | .13  | .06  | .95  | .95  | 
  | 
  | .12  | .11  | 
  | ||
  | 20,000  | .44  | .34  | .87  | .67  | N/A  | .41  | .44  | 
  | .42  | .52  | 
  | .30  | .51  | 
  | 
  | .17  | .17  | .08  | 1.17  | 1.22  | 
  | 
  | .19  | .17  | 
  | ||
  | 22,000  | .51  | .39  | 1.02  | .79  | N/A  | .50  | .53  | 
  | .51  | .63  | 
  | .36  | .62  | 
  | 
  | .21  | .21  | .10  | .23  | 
  | .20  | 
  | |||||
  | 10,000  | .17  | .13  | .23  | .17  | .12  | .10  | .11  | 
  | .13  | .16  | 
  | .07  | .15  | 
  | 
  | .04  | .04  | .01  | .37  | .30  | 
  | 
  | .03  | .05  | 
  | ||
  | 14,000  | .29  | .22  | .39  | .29  | .26  | .20  | .22  | 
  | .22  | .28  | 
  | .15  | .28  | 
  | 
  | .07  | .07  | .03  | .56  | .50  | 
  | 
  | .07  | .08  | 
  | ||
50/55 17,000  | .39  | .30  | .53  | .40  | .39  | .29  | .32  | 
  | .31  | .40  | 
  | .22  | .41  | 
  | 
  | .10  | .10  | .04  | .72  | .68  | 
  | 
  | .12  | .11  | 
  | |||
  | 20,000  | .51  | .39  | .68  | .52  | .58  | .41  | .44  | 
  | .42  | .52  | 
  | .30  | .51  | 
  | 
  | .12  | .12  | .05  | .88  | .88  | 
  | 
  | .19  | .17  | 
  | ||
  | 24,000  | .69  | .53  | .91  | .70  | .73  | .58  | .62  | 
  | .48  | .72  | 
  | .45  | .75  | 
  | 
  | .16  | .16  | .07  | 1.11  | 1.17  | 
  | 
  | .30  | .23  | 
  | ||
  | 28,000  | .88  | .68  | 1.17  | .91  | .99  | .79  | .84  | 
  | .62  | .98  | 
  | .61  | .99  | 
  | 
  | .20  | .20  | .10  | .39  | 
  | .30  | 
  | |||||
  | 12,000  | .13  | .10  | .25  | .18  | .10  | .08  | .16  | 
  | .10  | .13  | 
  | .06  | .11  | 
  | 
  | .05  | .05  | .01  | .44  | .37  | 
  | 
  | .02  | .07  | 
  | ||
  | 16,000  | .20  | .16  | .39  | .29  | .18  | .14  | .29  | 
  | .17  | .21  | 
  | .11  | .19  | 
  | 
  | .07  | .07  | .02  | .63  | .58  | 
  | 
  | .05  | .10  | 
  | ||
60  | 20,000  | .29  | .23  | .55  | .42  | .27  | .21  | .44  | 
  | .24  | .31  | 
  | .16  | .27  | 
  | 
  | .10  | .10  | .03  | .84  | .82  | 
  | 
  | .10  | .16  | 
  | ||
  | 24,000  | .39  | .31  | .74  | .57  | .40  | .30  | .62  | 
  | .33  | .42  | 
  | .22  | .39  | 
  | 
  | .11  | .11  | .04  | 1.06  | 1.08  | 
  | 
  | .16  | .23  | 
  | ||
  | 28,000  | .50  | .39  | .95  | .73  | .48  | .33  | .85  | 
  | .44  | .55  | 
  | .32  | .50  | 
  | 
  | .17  | .17  | .06  | .30  | 
  | .30  | 
  | |||||
  | 30,000  | .56  | .44  | 1.06  | .82  | .62  | .38  | .98  | 
  | .51  | .63  | 
  | .37  | .57  | 
  | 
  | .20  | .20  | .07  | .34  | 
  | .34  | 
  | |||||
  | 12,000  | .20  | .16  | N/A  | N/A  | .10  | .08  | .16  | 
  | .10  | .13  | 
  | .06  | .11  | 
  | 
  | .05  | .05  | .01  | .44  | .37  | 
  | 
  | .02  | .07  | 
  | ||
  | 16,000  | .32  | .26  | N/A  | N/A  | .18  | .14  | .29  | 
  | .17  | .21  | 
  | .11  | .19  | 
  | 
  | .07  | .07  | .02  | .63  | .58  | 
  | 
  | .05  | .10  | 
  | ||
  | 20,000  | .46  | .37  | N/A  | N/A  | .27  | .21  | .44  | 
  | .24  | .31  | 
  | .16  | .27  | 
  | 
  | .10  | .10  | .03  | .84  | .82  | 
  | 
  | .10  | .16  | 
  | ||
  | 22,000  | .54  | .43  | N/A  | N/A  | .33  | .25  | .53  | 
  | .29  | .37  | 
  | .19  | .33  | 
  | 
  | .12  | .12  | .04  | .95  | .95  | 
  | 
  | .13  | .20  | 
  | ||
70  | 24,000  | .62  | .50  | N/A  | N/A  | .40  | .30  | .62  | 
  | .33  | .42  | 
  | .22  | .39  | 
  | 
  | .14  | .14  | .04  | 1.06  | 1.08  | 
  | 
  | .16  | .23  | 
  | ||
  | 26,000  | .70  | .56  | N/A  | N/A  | .47  | .32  | .73  | 
  | .39  | .49  | 
  | .27  | .45  | 
  | 
  | .16  | .16  | .05  | 1.17  | 1.23  | 
  | 
  | .23  | .26  | 
  | ||
  | 28,000  | .79  | .64  | N/A  | N/A  | .54  | .33  | .85  | 
  | .44  | .55  | 
  | .32  | .50  | 
  | 
  | .17  | .17  | .06  | 1.22  | 1.29  | 
  | 
  | .30  | .30  | 
  | ||
  | 31,000  | .93  | .75  | N/A  | N/A  | .60  | .40  | 1.04  | 
  | .49  | .61  | 
  | .39  | .55  | 
  | 
  | .21  | .21  | .07  | .37  | 
  | .36  | 
  | |||||
  | 33,000  | 1.03  | .83  | N/A  | N/A  | .65  | .46  | 1.18  | 
  | .52  | .67  | 
  | .44  | .60  | 
  | 
  | .24  | .24  | .08  | .42  | 
  | .40  | 
  | |||||
  | 12,000  | .25  | .18  | .31  | .23  | .10  | .08  | .16  | 
  | .10  | .13  | 
  | .06  | .11  | 
  | 
  | .05  | .05  | .01  | .44  | .37  | 
  | 
  | .02  | .07  | 
  | ||
  | 16,000  | .39  | .29  | .49  | .37  | .18  | .14  | .29  | 
  | .17  | .21  | 
  | .11  | .19  | 
  | 
  | .07  | .07  | .02  | .63  | .58  | 
  | 
  | .05  | .10  | 
  | ||
  | 20,000  | .55  | .42  | .69  | .53  | .27  | .21  | .44  | 
  | .24  | .31  | 
  | .16  | .27  | 
  | 
  | .10  | .10  | .03  | .84  | .82  | 
  | 
  | .10  | .16  | 
  | ||
  | 22,000  | .65  | .49  | .81  | .62  | .33  | .25  | .53  | 
  | .29  | .37  | 
  | .19  | .33  | 
  | 
  | .12  | .12  | .04  | .95  | .95  | 
  | 
  | .13  | .20  | 
  | ||
75  | 24,000  | .74  | .57  | .93  | .71  | .40  | .30  | .62  | 
  | .33  | .42  | 
  | .22  | .39  | 
  | 
  | .14  | .14  | .04  | 1.06  | 1.08  | 
  | 
  | .16  | .23  | 
  | ||
  | 26,000  | .84  | .65  | 1.05  | .81  | .47  | .32  | .73  | 
  | .39  | .49  | 
  | .27  | .45  | 
  | 
  | .16  | .16  | .05  | 1.17  | 1.23  | 
  | 
  | .23  | .26  | 
  | ||
  | 28,000  | .95  | .73  | 1.19  | .92  | .54  | .33  | .85  | 
  | .44  | .55  | 
  | .32  | .50  | 
  | 
  | .17  | .17  | .06  | 1.22  | 1.29  | 
  | 
  | .30  | .30  | 
  | ||
  | 31,000  | 1.12 .87  | 1.40 1.08  | .60  | .40  | 1.04  | 
  | .49  | .61  | 
  | .39  | .55  | 
  | 
  | .21  | .21  | .07  | .37  | 
  | .36  | 
  | |||||||
  | 33,000  | 1.24 .96  | 1.55 1.20  | .65  | .46  | 1.18  | 
  | .52  | .67  | 
  | .44  | .60  | 
  | 
  | .24  | .24  | .08  | .42  | 
  | .40  | 
  | |||||||
76