Desa Comfort Glow CGR35NA Owner's Operation And Installation Manual page 10

INSTALLING
HEATER
Continued
10
VENTING HEATER
Proper Size Vent
To safely vent heater, the vent connector pipe must be the same diameter as the draft
hood outlet on the rear of the heater. Pipe that is too small can cause flue gas to spill
from the heater. Fasten vent connector to the draft hood outlet with a sheet metal screw.
Vent Types
Prefabricated or Masonry All-Fuel Chimney -
residential-type prefabricated chimney. Only use prefabricated chimneys listed by
Underwriters Laboratories (UL), Inc.
Type-B Vent - These vents are made of noncombustible, corrosion resistant
material. They are certified by a nationally recognized testing agency. Type-B
vents are double-walled pipe. Clearances to combustible construction must be in
accordance with the listing of the particular type-B vent. Type-B vents are cur-
rently listed as B-1, B-1
The illustrations below show both vent types. The illustration shows typical
construction of each type of venting system. Minimum clearances and lengths are
added to the illustrations.
6"
5'
Min.
Min.
Heater
Prefabricated or Ma-
sonry All-Fuel Chimney
Figure 5 - Typical Construction of Venting Systems
(continued)
This is a masonry chimney or a
1
/ , and B-2.
2
Terminate at least 5' above draft hood. If vent extends
over 5' above roof, support with guy wires or braces.
Vent Cap
Must Be At
Least 2 Feet
Above
Highest Point
Within 10
Feet.
Maintain Listed
Clearance of Vent
Support If
Necessary
Lock Joints
Lock Joints
Vent
Connector
Seal Around
Collar and
Flashing
Lock
Joints
Position
Support
Firestop
Laterals
Maintain Listed
Clearance of
53"
Vent
Min.
Vertical Vent
Heater
Type-B Vent
Continued
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