Rinnai EX08DT Installation And Operation Manual page 20

Guidelines (EX11DT Model Only):
IMPORTANT
Extension Kit Applies to EX11DT Model Only. Extension Kit not available for EX08DT Model.
1. The maximum vent length is 13 feet (4 m) with 3 bends. The bent pipe attached to the furnace does
not count toward the max limit of 3 bends.
2. For altitudes at or below 2000 feet (610 m), the maximum vertical length is 8 feet (2.4 m). For altitudes
above 2000 feet (610 m), the maximum vertical length is 5 feet (1.5 m).
3. If the extension is longer than that shown in the table below, the condensate may overflow the
condensation pan. Therefore, extensions exceeding this length should drain to the outside and sloped
3° downward.
4. Do not allow any low points or sagging in the exhaust line. Otherwise, condensate may block the
exhaust and affect combustion.
5. Vent extensions installed in unconditioned air space must be insulated with high temperature insulation
and must be accessible.
6. Vent extensions must not be concealed per NFPA 54 and must be accessible allowing inspection and
repair. Decorative covers are available from Rinnai.
7. Clearances:
Exhaust pipe to combustibles: 1 in. (25.4 mm)
Configurations
The following figures show the three possible ways that the extension exhaust line and air intake hose may
be directed away from the furnace. All 3 views are from behind the furnace. For your configuration, position
the air intake hose as shown in the following figures.
Correct Configurations
Extension through the top
AIR
INTAKE
HOSE
PIPE
CLAMP
Figure 16
20
Exhaust pipe to non-combustibles: 0 in. (0 mm)
Extension to the left (facing furnace)
EXHAUST
PIPE
CLAMP
AIR
INTAKE
PIPE
HOSE
STOPPER A
Extension to the right (facing furnace)
EXHAUST
PIPE
CLAMP
PIPE
CLAMP
PIPE
STOPPER A
CLAMP
EX08DT and EX11DT Installation and Operation Manual
LONG BENT ELBOW PIPE
STOPPER A
EXHAUST
PIPE
PIPE
CLAMP
EXHAUST
ELBOW
LONG
BENT
ELBOW
EXHAUST
ELBOW
AIR
INTAKE
HOSE