Rheem Raypa DELTA 399B Installation And Operation Manual page 31

Certified
Model
Venting
No.
Material
399B
499B
649B
749B
899B
989B
Category III
1259B
1529B
1799B
1999B
2069B
2339B
*Subtract 10 ft per elbow. Max. 3 elbows.
Maximum combustion air duct length terminated at 100 equivalent ft.
Care must be taken during assembly to ensure that
all joints are sealed properly and are airtight. The vent
must be installed to prevent the potential accumulation
of condensate in the vent pipes. It is required that:
1. The vent must be installed with a slight down-
ward slope of not more than 1/4 inch per foot of
horizontal run to the vent terminal.
2. The vent must be insulated through the length of
the horizontal run.
3. The horizontal portions of the venting system shall
be adequately supported to prevent sagging.
For installations in extremely cold climate, it is
required that:
1. The vent must be installed with a slight upward
slope of not more than 1/4 inch per foot of hor-
izontal run to the vent terminal. In this case, an
approved condensate trap must be installed per
applicable codes.
2. The vent must be insulated through the length of
the horizontal run.
Maximum
Vent
Equivalent
Size
Vent Length*
6"
8"
70'Room Air
10"
40' Ducted Com-
bustion Air
12"
14"
16"
Table M: Category III Horizontal and Direct Venting
Combustion
Air
Intake Pipe
6"
Material
100'
75'
40'
30'
Galvanized
Steel,
PVC, ABS,
CPVC
Termination
The flue direct vent cap MUST be mounted on the ex-
terior of the building. The direct vent cap cannot be
installed in a well or below grade. The direct vent cap
must be installed at least 1 ft above ground level and
above normal snow levels. The Raypak-approved
stainless steel flue direct vent cap must be used (sales
order option D-15).
AWARNING: No substitutions of flue pipe or vent
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
The vent and intake pipe material are certified to fol-
lowing standards:
PVC- ANSI/ASTM D1785
CPVC ASTM-D2846
PPS (where applicable) - ULC-S636,
Steel-certified for Cat IV or direct vent appliance
venting.
NOTE: Please refer to Table N for model specific
details.
Air Inlet Max. Length*
8" 10"
100'
80'
75'
40'
12"
100'
75'
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