14 National Oilheat Research Alliance Total Eff. Lgth., Duct & Ftgs., in Ft. Corrected Pressure Drop (Friction) Per 100 FT. Duct Length* Total Pressure Drop (in. of water column) .05 .06 .08 .10 .125 14 .16 .18 .20 .25 .30 .34 .375 .40 .50 .625 .75 1.00 35-44 .13 .15 .20 .25 .32 .35 .40 .45 .50 .63 .75 .85 .95 1.00 1.25 1.58 1.90 2.54 45-54 .10 .12 .16 .20 .25 .28 .32 .36 .40 .50 .60 .68 .76 .80 1.00 1.26 1.52 2.02 55-64 .08 .10 .13 .17 .21 .23 .27 .30 .33 .42 .50 .57 .63 .67 .83 1.05 1.26 1.68 66-74 .07 .09 .11 .14 .08 .20 .23 .26 .29 .36 .43 .49 .54 .57 .72 .90 1.08 1.44 75-84 .06 .08 .10 .13 .16 .18 .20 .23 .25 .31 .38 .43 .47 .50 .63 .79 .94 1.26 58-94 .06 .07 .09 .11 .14 .16 .18 .20 .22 .28 .33 .38 .42 .45 .56 .70 .84 1.12 95-104 .05 .06 .08 1.0 .13 .14 .16 .18 .20 .25 .30 .33 .38 .40 .50 .63 .75 1.01 105-114 .05 .05 .07 .09 .11 13 .15 .16 .18 .23 .28 .34 .31 .37 .46 .57 .69 .91 115-129 .04 .05 .07 .08 .10 .12 .13 .15 .17 .21 .25 .27 31 .33 .47 .51 .62 .82 130-149 .04 .04 .06 .07 .09 .10 .11 .13 .14 18. .21 .24 .27 .29 .36 .45 .54 .72 150-169 .03 .04 .05 .06 .08 .09 .10 .11 .13 .16 .19 .21 .24 .25 .31 .39 .47 .53 170-189 .03 .03 .04 .06 .07 .08 .09 .10 .11 .14 .17 .19 .21 .22 .28 .35 .42 .56 190-214 .03 .03 .04 .05 .06 .07 .08 .09 .10 .13 .15 .17 .19 .20 .25 .31 .37 .50 215-239 .02 .03 .04 .05 .05 .06 .07 .08 .09 .11 .13 .15 .17 .18 .22 .28 .33 .44 240-264 .02 .02 .03 .04 .05 .06 .06 .07 .08 .10 .12 .14 .15 .16 .20 .25 .30 .40 265-289 .02 .02 .03 .04 .04 .05 .06 .07 .07 .09 .11 .12 .14 .15 .18 .23 .27 .36 290-324 .02 .02 .03 .03 .04 .05 .05 .06 .07 .08 .10 .11 .12 .13 .17 .20 .24 .33 325-374 .02 .02 .02 .03 .04 .04 .05 .05 .06 .07 .09 .10 .11 .11 .14 .18 .21 .29 375-424 .01 .02 .02 .03 .03 .04 .04 .05 .05 .06 .08 .09 .09 .10 .13 .16 .19 .28 425-474 .01 .01 .02 .03 .03 .03 .04 .04 .05 .06 .07 .08 .08 .09 .11 .14 .17 .22 475-524 .01 .01 .02 .02 .03 .03 .03 .04 .04 .05 .06 .07 .08 .08 .10 .13 .15 .20 525-574 .01 .01 .02 .02 .02 .03. .03 .03 .04 .05 .06 .07 .07 .07 .09 .11 .14 .18 575-625 .01 .01 .01 .02 .02 .02 .03 .03 .03 .04 .05 .06 .06 .07 .08 .10 .13 .17 Figure 14
NORA Advanced Air Flow
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