Rinnai REU-VA3237FFU Operation And Installation Manual page 33

Direct vent tankless water heater
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Flue Installation (R98LSi, R98LSi-ASME)
Horizontal with Concentric Termination
SLOPE INTAKE AND EXHAUST
TOWARD OUTSIDE TERMINATION
MINIMUM 1/4" PER FOOT
Vertical Terminations
The air intake requires a return bend or two 90º elbows to prevent entry of rain.
VA Series Indoor LS Manual
33

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