035-17480-000 Rev. A (800)
Unitary Products Group
17
7.
Avoid areas where condensate drippage may cause
problems such as above planters, patios, or adjacent to
windows where steam may cause fogging.
NOTE:Consideration must be given for degradation of build-
ing materials by flue gases.
NOTE:Shaded components of the vent system shown in Fig-
ures Figure 17 through Figure 20 are considered to be part
of the termination. These components should not be counted
when determining piping limitations. Sidewall termination
may require sealing or shielding of building surfaces with a
corrosive resistant material to protect against combustion
product corrosion.
PIPING ASSEMBLY
The final assembly procedure for the vent piping is as follows:
1.
Cut piping to the proper length, beginning at the furnace.
2.
Deburr the piping inside and outside.
3.
Chamfer the outer edges of the piping.
4.
Dry-fit the entire vent piping system.
5.
Disassemble the piping and apply cement primer and
cement per the cement manufacturer's instructions.
Primer and cement must conform to ASTM D2564 for
PVC, or ASTM D2235 for ABS piping.
6.
All joints must be made to provide a permanent, air tight.
water tight seal.
7.
Support the vent piping such that it is angled 1/4” per lin-
ear foot so that condensate will flow back towards the
furnace. Piping should be supported with pipe hangers to
prevent sagging. Maximum spacing between hangers is
5 feet, except SDR-PVC piping, where maximum spac-
ing is 3 feet.
8.
Seal around the openings where the vent piping passes
through the roof or side wall.
NOTE:Vent pipe must be sloped 1/4” per foot to allow con-
densate to flow back to the furnace.
FIGURE 18 :
Horizontal Termination
Configuration With 12”
Minimum Clearance
FIGURE 19 :
Horizontal Termination Raised
Configuration For Additional Clearance
VENT ELBOW
MAINTAIN 12" CLEARANCE ABOVE
HIGHEST ANTICIPATED SNOW LEVEL
OR GRADE, WHICHEVER IS GREATER
12"
VENT
MAINTAIN 12" CLEARANCE ABOVE
HIGHEST ANTICIPATED SNOW LEVEL
OR GRADE, WHICHEVER IS GREATER
90°
12" MINIMUM
FIGURE 20 :
Rooftop Termination
Solvent cements are flammable and must be used
in well-ventilated areas only. Keep them away from
heat, sparks and open flames (including pilots). Do
not breathe vapors and avoid contact with skin and
eyes.
Vent piping must be insulated with 1/2” Armaflex
insulation if it will be subjected to freezing temper-
atures such as routing through unheated areas or
through an unused chimney.
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL.
MAXIMUM OF 24" ABOVE ROOF
VENT
