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Model
ADB-751 w/CHX
ADB-1001 w/CHX
ADB-1501 w/CHX
*Contact the manufacturer for details.
Table O: Vertical Vent (CATEGORY IV) with Add-on Condensing Heat Exchanger
Vertical Vent (Category IV) with
Add-on Condensing Heat Exchanger
Installation
These installations utilize the boiler mounted blower to
vent the combustion products to the outdoors.
Combustion air is taken from inside the room and the
vent is installed vertically through the roof to the out-
doors. Adequate combustion and ventilation air must
be supplied to the boiler room in accordance with the
National Fuel Gas Code or, in Canada, the latest edi-
tion of CSA B149 Installation Code for Gas Burning
Appliances and Equipment.
UL 1738 Certified Venting Material (e.g. AL29-4C)
MUST be used. The vent must be installed to prevent
the flue gas leakage. Care must be taken during
assembly to ensure that all joints are sealed properly
and are airtight.
Fig. 26: Horizontal Thru-wall Venting with Add-on Condensing Heat Exchanger (CHX)
Certified Venting
Venting Category
UL 1738 Certified
Venting Material e.g.
IV
AL29-4C Stainless
Steel PVC*, CPVC*
UL 1738 Certified
Venting Material e.g.
IV
AL29-4C Stainless
Steel PVC*, CPVC*
UL 1738 Certified
Venting Material e.g.
IV
AL29-4C Stainless
Steel PVC*, CPVC*
Vent Size (inches)
Material
10
12
For certain installations, i.e. pool, heat-pump domestic
hot water with pre-heat tank, PVC or CPVC may be
used. Contact the manufacturer for details.
To prevent the condensation accumulation in the vent,
it is required to install the horizontal portion of vent with
a slight upward slope of not more than 1/4" per foot of
horizontal run and an approved condensate trap must
be installed per applicable codes.
WARNING: No substitutions of flue pipe or vent
cap material are allowed. Such substitutions would
jeopardize the safety and health of inhabitants.
The Stainless Steel non-restricted direct vent cap
must be furnished by the boiler manufacturer in
accordance with its listing.
35
Maximum Vent
Length (feet)
55 Subtract 10 ft per
8
elbow, Max. 3
elbows
55 Subtract 10 ft per
elbow, Max. 3
elbows
55 Subtract 10 ft per
elbow, Max. 3
elbows
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