TABLE 15
Winter
Design
Temp
1
°F (°C)
Vent
Pipe
Diam
Unit Input Size
PP
PP
PP
PP
PP
PP
16
9 9
9 16
1
1
19 19
19
1
16 16
1Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.
2 Poly-Propylene vent pipe (PP) by Duravent and Centrotherm.
NOTE - Concentric terminations are the equivalent of 5’ and should be considered when measuring pipe length.
NOTE - Maximum uninsulated vent lengths listed may include the termination(vent pipe exterior to the structure) and cannot ex-
ceed 5 linear feet or the maximum allowable intake or exhaust vent length listed in table TABLE 13 which ever is less.
NOTE - If insulation is required in an unconditioned space, it must be located on the pipe closest to the furnace. See FIGURE 31.
3 Vent length in the table is equivalent length. Each elbow is equivalent to 5ft of straight pipe and should be included when mea-
suring total length.
Conditioned
Space
Unconditioned
Space
Exhaust
Pipe
Intake
Pipe
Conditioned
Space
Pipe Insulation
FIGURE 31
To Next Page
Loading...
