22 Rinnai Corporation RHFE-263FA
Extension InstallationKit If necessary, extention 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 (4m) with 2 bends. The bent pipe attached to the
appliance dose not count toward the max limit of 2 bends. The maximum vertical length is 8 feet (2.4m). Any
length (horizontal and vertical) in excess of 8 feet (2.4m) 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 extentions 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) Extension to the right (facing appliance)
Extension through the top
INCORRECT
Too many bends (limit is 2)
Air intake hose is above exhaust
pipe.
LONG BENT ELBOW
LONG BENT
ELBOW
PIPE STOPPER A
EXHAUST
PIPE
PIPE CLAMP
EXHAUST
ELBOW
AIR INTAKE HOSE
CLAMP
PIPE STOPPER A
EXHAUST PIPE
CLAMP
PIPE
STOPPER A
PIPE CLAMP
PIPE CLAMP
AIR INTAKE
HOSE AIR INTAKE
HOSE
EXHAUST
PIPE
EXHAUST
ELBOW
CLAMP