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Rinnai Corporation ES38 Manual 23
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. 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
INCORRECT
• Too many bends (limit is 2)
• Air intake hose is above exhaust
pipe
CORRECT