The Rinnai FOT-155 11-20 in. vent extension kit extends the exhaust line and air intake hose between a Rinnai EX11DT direct vent wall furnace and its wall vent kit, so the furnace can be installed away from the exterior wall. Bends in the run use the FOT-158 bent elbow or FOT-201 long bent elbow, sold separately.

Note: Rinnai does not offer an extension kit for the EX08DT.

Compatible with

• EX11DTN / EX11DTP

Rinnai venting guidelines (EX11DT)

• Maximum vent length 13 ft (4 m) with 3 bends; the bent pipe attached to the furnace does not count toward the 3 bends
• Maximum vertical length 8 ft (2.4 m) at or below 2,000 ft altitude, 5 ft (1.5 m) above 2,000 ft
• Extensions longer than the limit in the manual's table must slope 3° downward and drain to the outside
• No low points or sagging in the exhaust line
• Extensions in unconditioned space must be insulated with high-temperature insulation
• Extensions must not be concealed and must stay accessible for inspection (NFPA 54)
• Clearance from exhaust pipe: 1 in. to combustibles, 0 in. to non-combustibles

See the furnace's Installation and Operation Manual for configurations and full instructions.