035-17480-000 Rev. A (800)
Unitary Products Group
13
VENTING MULTIPLE UNITS
Each unit must have its own intake/vent piping and termina-
tion. Do not use common pipes for combustion air or venting.
The vent terminals must be located as shown in Figure 14
and Figure 15.
PIPING ASSEMBLY
The final assembly procedure for the vent/combustion air pip-
ing 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/combustion air piping assembly.
FIGURE 11 :
Horizontal Termination Raised Configura-
tion For Additional Clearance
FIGURE 12 :
Horizontal Termination Configuration With
Horizontal Extension
VENT
OVERHANG
COMBUSTION AIR
(ELBOW PARALLEL TO WALL)
12" SEPARATION BETWEEN
BOTTOM OF COMBUSTION AIR
AND BOTTOM OF VENT
MAINTAIN 12" CLEARANCE ABOVE
HIGHEST ANTICIPATED SNOW LEVEL
OR GRADE, WHICHEVER IS GREATER
12" MINIMUM
90°
VENT
OVERHANG
COMBUSTION AIR
12" SEPARATION BETWEEN
BOTTOM OF COMBUSTION AIR
AND BOTTOM OF VENT
MAINTAIN 12" CLEARANCE ABOVE
HIGHEST ANTICIPATED SNOW LEVEL
OR GRADE, WHICHEVER IS GREATER
12" MINIMUM
90°
18" MAXIMUM
FIGURE 13 :
Vertical Termination
FIGURE 14 :
Double Sidewall Termination
FIGURE 15 :
Double Rooftop Termination
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL.
MAXIMUM OF 24" ABOVE ROOF
COMBUSTION AIR
VENT
12" VERTICAL SEPARATION
BETWEEN COMBUSTION
AIR AND VENT
VENT
COMBUSTION AIR
2"
6"
