Carrier N92ESN Installation, Start-Up, Operating And Service And Maintenance Instructions page 31

N92ESN: Installation, Start-up, Operating and Service and Maintenance Instructions
abandoned chimney to supply outside air to the furnace. See
references to vent clearances required by National code authorities.
A combustion air pipe to the outdoors is not required for a single-pipe
vent system. A 12-in. (304 mm) long pipe with a 2-in. (51 mm) tight
radius 90 degree elbow is required to be attached to the combustion air
¾ in. (222mm) for 3 in. (76mm)
¾ in. (172mm) for 2 in. (51mm)
Fig. 39 – Combustion Air and Vent Pipe Termination for Direct Vent (2-Pipe) System
Fig. 40 – Vent Pipe Termination for Non-Direct Vent and Ventilated Combustion Air System
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 47 for pipe adapter on the furnace. See
ensure stable combustion, as well as allow for sound attenuation. To aid
sound attenuation, point the inlet air pipe away from occupants. An extra
elbow and/or five feet of pipe may be used to accomplish the sound
attenuation function.
12 in. (305mm) min. separation
between bottom of combustion
air and bottom of vent (Typ.)
Roof Termination (Preferred)
Vent
Maintain 12 in (305mm) .
minimum clearance
above highest anticipated
snow level maximum of
24 in. (610mm) above roof .
Abandoned masonry
used as raceway
(per code)
12 in. (305 mm) min. from
overhang or roof
90°
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater.
Side wall termination
with 2 elbows (preferred)
31
Fig. 48. This short inlet air pipe helps to
12 in. min. (305 mm)from
overhang or roof
6 in. (152mm) minimum clearance
between wall and end of vent pipe.
10 in. (254mm) maximum pipe lengt h
Sidewall Termination
with Straight Pipe (preferred)
A13305
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater
A05091