Installation Manual

Specifications subject to change without notice.
440 01 4900 00 45
Abandoned masonry
used as raceway
(per code)
12 in. (305 mm) min. from
overhang or roof
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater.
Side wall termination
with 2 elbows (preferred)
12 in. min. (305 mm)from
overhang or roof
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater
6 in. (152mm) minimum clearance
between wall and end of vent pipe.
10 in. (254mm) maximum pipe length
Sidewall Termination
with Straight Pipe (preferred)
Roof Termination (Preferred)
Vent
Maintain 12 in .
minimum clearance
above highest anticipated
snow level maximum of
24 in. (610mm) above roof.
90°
(305mm)
A05091
Fig. 39 -- Vent Pipe Termination for Non --Direct Vent and Ventilated Combustion Air System
¾ in. (222mm) for 3 in. (76mm)
12 in. (305mm) min. separation
between bottom of combustion
air and bottom of vent (Typ.)
¾ in. (172mm) for 2 in. (51mm)
A13305
Fig. 40 -- Combustion Air and Vent Pipe Termination for Direct Vent (2-- Pipe) System
Ventilated Combustion Air
The vent pipe for a Ventilated Combustion Air System must
terminate outdoors. See Fig. 55 for references to vent clearances
required by National code authorities. Allowable vent terminations
are shown in Fig. 39. The combustion air pipe terminates in a
well--ventilated attic or crawl space. Follow the clearances as
shown in Fig. 57.
The combustion air pipe cannot terminate in attics or crawl spaces
that use ventilation fans designed to operate in the heating season.
If ventilation fans are present in these areas, the combustion air
pipe must terminate outdoors as a Direct Vent System.
Non-Direct Vent / 1-Pipe System
The vent pipe for a Non Direct Vent (1 --pipe) system must
terminate outdoors. See Fig. 55 for references to vent clearances
required by National Code authorities. Allowable vent
terminations are shown in Fig. 39.
A combustion air inlet pipe to the outdoors is not required for a
Non--Direct (single-- pipe) Vent System. A 12 --in. long section of
pipe with a tight radius 2--in. (51 mm) 90 degree elbow is required