Rheem RGRJ series Installation Instructions Manual page 23

FIGURE 20
STANDARD VERTICAL DIRECT VENTING
UPFLOW MODEL SHOWN (TYPICAL FOR DOWNFLOW MODELS)
EXHAUST
TERMINATION
ROOF LINE
EXHAUST PIPE
COMBUSTION
AIR PIPE
NOTES:
THE COMBUSTION AIR PIPE
MUST TERMINATE IN THE
SAME PRESSURE ZONE AS
THE EXHAUST PIPE.
INCREASE THE 12-IN. MINIMUM
TO KEEP TERMINAL OPENING ABOVE
ANTICIPATED LEVEL OF SNOW
ACCUMULATION WHERE
APPLICABLE.
WHEN 3-IN. DIAM. PIPE IS USED,
REDUCE TO 2-IN. DIAMETER BEFORE
PENETRATING ROOF. A MAXIMUM OF
18 IN. OF 2-IN. PIPE MAY BE USED
BEFORE PASSING THROUGH ROOF.
SUPPORT VERTICAL PIPE EVERY 6
FEET.
EXHAUST TERMINATION - TERMINATE
THE LAST 12 INCHES WITH 2 PVC
PIPE ON 90,000 THROUGH 120,000
BTUH MODELS. REDUCE AND
TERMINATE THE LAST 12 INCHES
WITH 1 1 ⁄ PVC PIPE ON 45,000
2
THROUGH 75,000 BTUH MODELS.
FIGURE 21
STANDARD HORIZONTAL DIRECT VENTING
UPFLOW MODEL SHOWN (TYPICAL FOR DOWNFLOW MODELS)
SUPPLY AIR
EXHAUST PIPE
COMBUSTION AIR PIPE
NOTES:
SUPPORT HORIZONTAL PIPE
EVERY FOUR FEET.
WHEN 3 IN. PIPE IS USED REDUCE TO 2 IN.
BEFORE PENETRATING OUTSIDE WALL.
18 IN. MAXIMUM. 2 IN. DIAMETER PIPE MAY
BE USED INSIDE THE WALL.
DETAIL "A" - EXHAUST TERMINATION
TERMINATE THE LAST 12 INCHES WITH 2
PVC PIPE ON 90,000 THROUGH 120,000
BTUH MODELS. REDUCE AND TERMINATE
THE LAST 12 INCHES WITH 1 1 ⁄ PVC PIPE
2
ON 45,000 THROUGH 75,000 BTUH MODELS.
INCREASE THE 12 IN. MINIMUM ABOVE
GRADE TO KEEP TERMINAL OPENINGS
ABOVE ANTICIPATED LEVEL OF SNOW
ACCUMULATION WHERE APPLICABLE.
DETAIL "B", INSTALL WIND DEFLECTOR
VANE IN 2 IN. PVC COUPLING IN VERTICLE
POSITION USING PVC SOLVENT.
THE COMBUSTION AIR TERMINATION MUST
BE IN THE SAME PRESSURE ZONE AS THE
EXHAUST TERMINATION.
3" MAX.
SEPARATION
COMBUSTION AIR
PIPE
12" MIN.
SEPARATION
12" MIN. ABOVE
ROOF LEVEL
SUPPLY AIR
RETURN AIR
2 OR 3 TEE
W/DRAIN TRAP
TRAP
CONNECT
TO DRAIN
RETURN AIR
2 PVC
VANE
COUPLING
COMBUSTION AIR TERMINATION
DETAIL B
EXHAUST
VENT
3"
EXHAUST
MAX.
VENT
COMBUSTION
AIR PIPE
12"
MIN.
12" MIN.
ROOF LINE
EXHAUST VENT
PITCHED ROOF INSTALLATIONS
EXHAUST TERMINATION
12
4
SEE DETAIL A
4
12 MIN. ABOVE
GRADE LEVEL
SEE DETAIL B
4
INTAKE
EXHAUST / INTAKE RELATIONSHIP
3"
MAX.
COMBUSTION
AIR PIPE
12"
MIN.
12" MIN.
ANTICIPATED
SNOW LEVEL
I407
12
DETAIL A
3
EXHAUST
OPTIONAL
INTAKE
DETAIL C
I407
23