Extension Kit Installation - Rinnai EX38CT RHFE-1005FTA2 Installation And Operation Manual

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.
Horizontal sections should be sloped 3º to drain
condensate. (3º equals 2/3 inch drop per foot of vent.)
The direction should be to the outside (if local codes
allow) or toward the appliance. Do not allow any low
points in the exhaust line where condensate will collect.
Vent extensions installed in unconditioned air space
Slope horizontal sections 3º (2/3 inch drop per foot of vent.)
CORRECT
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.
The EX38CT is capable of two vent length settings:
Short Vent: 0 - 7ft + 1 elbow
Long Vent: 7ft + 1 elbow - 13ft + 2 elbows
INCORRECT
• Too many bends (limit is 2)
• Air intake hose is above
Rinnai Corporation EX38CT Manual
NOTE
exhaust pipe
13