Fig. 11—Attic Location and Working Platform for Direct Vent (2-Pipe) Applications--All Sizes
A93031
COMBUSTION – AIR
INTAKE
VENT
MANUAL
SHUTOFF
GAS VALVE
SEDIMENT
TRAP
CONDENSATE
TRAP
DRAIN
ACCESS OPENING
FOR TRAP
30″ MIN
WORK AREA
A 12-IN. MIN HORIZONTAL PIPE
SECTION IS RECOMMENDED WITH
SHORT (5 TO 8 FT) VENT SYSTEMS
TO REDUCE EXCESSIVE
CONDENSATE DROPLETS FROM
EXITING THE VENT PIPE.
5
3
⁄
4
″
NOTE: LOCAL CODES MAY REQUIRE A DRAIN PAN UNDER THE
FURNACE AND CONDENSATE TRAP WHEN A CONDENSING
FURNACE IS INSTALLED ABOVE FINISHED CEILINGS.
Fig. 12—Attic Location and Working Platform for Non-Direct
Vent (1-pipe) Applications-Sizes 040 Through 120 Only
A96184
VENT
MANUAL
SHUTOFF
GAS VALVE
SEDIMENT
TRAP
CONDENSATE
TRAP
DRAIN
ACCESS OPENING
FOR TRAP
30-IN. MIN
WORK AREA
A 12-IN. MIN HORIZONTAL PIPE
SECTION IS RECOMMENDED WITH
SHORT (5 TO 8 FT) VENT SYSTEMS
TO REDUCE EXCESSIVE
CONDENSATE DROPLETS FROM
EXITING THE VENT PIPE.
A 3-IN. MINIMUM CLEARANCE
TO COMBUSTION-AIR INTAKE
IS REQUIRED.
5
3
⁄
4
″
NOTE: LOCAL CODES MAY REQUIRE A DRAIN PAN UNDER THE
FURNACE AND CONDENSATE TRAP WHEN A CONDENSING
FURNACE IS INSTALLED ABOVE FINISHED CEILINGS.
COMBUSTION–AIR
INTAKE
—12—
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