COMBUSTION AIR INTAKE
(OPTIONAL)
*Not required for
single pipe installation
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INTAKE
SCREEN
OPTIONAL
12” MIN TO ROOF OR HIGHEST ANTICIPATED SNOW LEVEL
TEE (OPTIONAL)
12” MIN
HEIGHT DIFFERENCE BETWEEN
INTAKE AND VENT
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VENT/FLUE AND COMBUSTION AIR PIPE LENGTHS AND DIAMETERS
Refer to the following table for applicable length, elbows, and pipe di- ameter 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 elbows 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 objec- tionable, insulation of the combustion air pipe may be required. Use 1/2” thick closed cell foam insulation such as Armaflex™ or Insultube where required.
VENT/FLUE AND COMBUSTION AIR PIPE TERMINATIONS
The vent/flue and combustion air pipes may terminate vertically, as through a roof, or horizontally, as through an outside wall.
ELBOWS
STRAIGHT
_______________
12" MIN.
VENT/FLUE TEE (OPTIONAL)
or
45° ELBOW
TURNED DOWN or
90° ELBOW TURNED
DOWN
12" MIN. ABOVE HIGHEST ANTICIPATED
SNOW LEVEL
Horizontal Termination (Single Pipe)
Above Highest Anticipated Snow Level
DIRECT VENT (DUAL PIPE) PIPING
The inlet air screens provided in the installation instruction packet are available for the installer to use in the inlet of the combustion air pipe to prevent animals from building nests in the combustion air pipe. Instal- lation of screens, while strongly recommended, is not required and will not affect performance of the unit.
Direct vent installations require both a combustion air intake and a vent/flue pipe. The pipes may be run horizontally and exit through the side of the building or run vertically and exit through the roof of the building. The pipes may be run through an existing unused chimney; however, they must extend a minimum of 12 inches above the top of the chimney. The space between the pipes and the chim- ney must be closed with a weather tight, corrosion resistant flashing. Both the combustion air intake and a vent/flue pipe terminations must be in the same atmospheric pressure zone. For details concerning connection of pipes to the furnace, refer to the Vent/Flue Pipe and Combustion Pipe - Standard Furnace Connections or Alternate Fur- nace Connections.
Refer to Vent/Flue Pipe and Combustion Pipe - Termination Loca- tions 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.
Horizontal terminations should be as shown in the following fig- ure. Refer to Vent/Flue Pipe and Combustion Pipe - Termination Location for location restrictions. A 2 3/8” diameter wall penetra- tion is required for 2” diameter pipe. A 3” diameter hole is required for a 2 1/2” pipe and a 3 1/2” diameter hole is required for 3” diameter pipe. The wall penetration should be sealed with silicone caulking material.
10”- 24”
6” MAX
4” MIN
90º OR 45°
ELBOW
SCREEN
(OPTIONAL)
12" MIN. TO GRADE OR HIGHEST ANTICIPATED SNOW LEVEL
Standard Horizontal Terminations (Dual Pipe)
Vent & Combustion Air Intake Measurements for Standard Hori- zontal 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.
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