Rinnai RHFE-750ETRA Owner's Operation & Installation Manual page 24

Venting
Additional Venting Clearances
The top of the vertical termination should not be less
than 18 inches from the storm collar.
Vent Length Switch
If using extended venting, move
the dip switch in the control panel
to L-F.
24
Refer to the instructions of the vent system manufacturer
for complete component assembly instructions.
Rinnai Corporation RHFE-750ETRA
Horizontal Vent Termination
Wall
The distance between the
wall and the air inlet cover
should be 1.0 - 2.36 inches
(25 - 60 mm)
Vent Length Switch