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Vent/Intake Terminations For Installation Of Multiple Direct Vent Furnaces - Maytag Amana MES9 Series Installation Instructions Manual

Single-stage gas furnace, type fsp category iv direct or non direct vent air furnace
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Alternate Horizontal Vent Termination (Dual Pipe)
Vent/Flue & Combustion Air Pipe Lengths &
Diameters
Refer to the following table for applicable length, elbows, and
pipe diameter for construction of the vent/flue and combustion
air intake pipe systems of a direct vent (dual pipe) installation.
The number of elbows tabulated represents the number of el-
bows and/or tees in each (Vent/Flue & Combustion Air Intake)
pipe. Elbows and/or tees used in the terminations must be
included when determining the number of elbows in the piping
systems.
If the combustion air intake pipe is to be installed above a
finished ceiling or other area where dripping of condensate
will be objectionable, insulation of the combustion air pipe
may be required.
Combustion Air Intake may also be snorkeled
to obtain 12" min ground clearance.
Alternate Vent Termination Above Anticipated Snow Level
(Dual Pipe)
Use 1/2" thick closed cell foam insulation such as Armaflex™
or Insultube™ where required.
90°
ELBOWS
3" - 24"
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
Figure 16
90°
ELBOWS
3"-24" BETWEEN PIPES
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
Figure 17
Vent/Flue and Combustion Air Pipe Terminations
The vent/flue and combustion air pipes may terminate vertical-
ly, as through a roof, or horizontally, as through an outside wall.
Vertical pipe terminations should be as shown in the follow-
ing figure. Refer to Vent/Flue Pipe and Combustion Pipe
- Termination Locations for details concerning location
restrictions. The penetrations through the roof must be
sealed tight with proper flashing such as is used with a
plastic plumbing vent.
Vent & Combustion Air Intake Measurements for Standard
Horizontal Terminations (Dual Pipe)
Center to center = 10" min / 24" max.
Vertical separation: 0" - 24"
Vent termination from wall = 8" min / 12" max.
Combustion air intake from wall = 6" max.
Vent and intake clearance to ground or anticipated snow
level = 12" min.
3" MIN
Termination of Multiple Direct Vent Furnaces
Vent/Intake Terminations For Installation of
Multiple Direct Vent Furnaces
If more than one direct vent furnace is to be installed verti-
cally through a common roof top, maintain the same minimum
clearances between the exhaust vent and air intake termina-
tions of adjacent units as with the exhaust vent and air intake
terminations of a single unit.
If more than one direct vent furnace is to be installed horizon-
tally through a common side wall, maintain the clearances as in
the following figure. Always terminate all exhaust vent outlets
at the same elevation and always terminate all air intakes at
the same elevation.
19
3"MIN
24"MAX
12" MIN SEPARATION
12" MIN TO GRADE OR HIGHEST
ANTICIPATED SNOW LEVEL
Figure 18

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