Rinnai R98LSI - Manual (Page 33)

VB Series Indoor LS Manual 33
Vertical Terminations
The air intake requires a return bend or two 90º elbows to prevent entry of rain.
SLOPE INTAKE AND EXHAUST
TOWARD OUTSIDE TERMINATION
MINIMUM 1/4" PER FOOT
Horizontal with Concentric Termination
Flue Installation (R98LSi
, R98LSi-ASME)
The vent termination and air intake must be in the same pressure zone.