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Extension Kit Installation
If necessary, extension kits are available to extend the exhaust line and air intake hose between the manifold and
the appliance. The maximum vent length is 13 feet (4 m) with 2 bends. The bent pipe attached to the appliance
does not count toward the max limit of 2 bends.
For altitudes at or below 2000 feet, the maximum vertical length is 8 feet (2.4 m). For altitudes above 2000 feet,
the maximum vertical length is 5 feet (1.5 m). Any length (horizontal and vertical) in excess of 8 feet (2.4 m) must
be sloped 3° downward toward the flue manifold to allow condensate to drain to the outside. Do not allow any
low points in the exhaust line where condensate will collect.
Vent extensions installed in unconditioned air space must be insulated with high temperature insulation and must
be accessible.
Vent extensions must not be concealed per NFPA 54 and must be accessible allowing inspection and repair.
Decorative covers are available from Rinnai.
Examples
Extension to the left (facing appliance)
LONG BENT ELBOW
AIR INTAKE
HOSE
Extension through the top
AIR INTAKE HOSE
PIPE CLAMP
22
Extension to the right (facing appliance)
PIPE STOPPER A
EXHAUST
PIPE
PIPE CLAMP
EXHAUST
ELBOW
STOPPER A
CLAMP
EXHAUST PIPE
PIPE STOPPER A
CLAMP
Rinnai Corporation ES11 Manual
PIPE CLAMP
EXHAUST
PIPE
PIPE
CLAMP
INCORRECT
• Too many bends (limit is 2)
• Air intake hose is above exhaust
pipe
LONG BENT
ELBOW
EXHAUST
ELBOW
AIR INTAKE
HOSE
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