Westinghouse WBCNG399WPU Installation Instruction
40
WHL-016 REV. 3.4.15
Figure 17
– Piping Exhaust around Obstructions – Suggested Condensate Removal
E. EXHAUST VENT AND INTAKE PIPE SIZING
1. The exhaust vent and intake pipes are 3” for 055/080/110/155/199/285 models, and 4” for the 399.
2. The total equivalent length of exhaust vent and intake pipe should not exceed 200 feet for all models EXCEPT the 285. Total
equivalent length for the 285 should not exceed 150 feet.
2. The total equivalent length of exhaust vent and intake pipe should not exceed 200 feet for all models EXCEPT the 285. Total
equivalent length for the 285 should not exceed 150 feet.
a. The equivalent length of friction loss in elbows, tees, and other fittings are listed in Table 11.
FRICTION LOSS EQUIVALENT FOR STAINLESS OR PLASTIC PIPING AND FITTINGS
FITTING DESCRIPTION
3”
4”
90
o
elbow short radius
5’
5’
90
o
elbow long radius
4’
4’
45
o
elbow
3’
3’
Coupling
0’
0’
Tee (intake only)
0’
0’
V Series Vent Kit
1’
1’
AL20 4C Vent Terminal
1’
1’
Pipe (All Materials)
1’
1’
Table 11 -
*Friction loss for long radius elbow is 1’ less. NOTE: Consult Polypropylene venting instructions for friction loss and pressure
drop equivalents.