User Manual - ALLSEASONS Heating And Cooling

when (H T) < (V T)VERTICAL TERMINATIONExample 3:13FIGURE 945°See graph to determine the required vertical rise V Tforthe required horizontal run H T.FIGURE1090°90°V 2H 2V 1H 145°90°REQUIRED VERTICAL RISE INFEET (V T)V 1=5 ftV 2=10 ftV T= V 1+ V 2= 5 + 10 = 15 ftH 1=3 ftH 2=2.5 ftH R= H 1+ H 2= 3 + 2.5 = 5.5 ftH O= .03(one 45º elbow + three 90º elbows - 135º)= .03(45+90+90+90-135)=5.4H T=H R+ H O= 5.5 + 5.4 = 10.9 ftH T+ V T= 10.9 + 15 = 25.9 ftFormula 1: H T< V T10.9 < 15Formula 2:H T+ V T< 40 feet25.9 < 40Since both formulas are met, this vent configuration is acceptable.HORIZONTAL VENT RUNPLUS OFFSETS IN FEET (H T)The shaded area within the lines represents acceptablevalues for H Tand V T.For vent configurations requiring more than one 45º andone 90° elbow , the following formulas apply:Formula 1: H T< V TFormula 2: H T+ V T< 40 feetW415-0496 / B / 08.10.05