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runs of the venting must slope towards the boiler ¼ to½" per linear foot
Chimney applications:
This venting system uses a single vent to discharge all flue gases to the outside vertically, combustion air provided with
the boiler room, the air source must be sized in accordance to national codes CSA B149 & ANSI Z223.1 or local codes
having jurisdiction, more than one source may be required.
This venting system uses two separate vents, a vent for combustion air and another for the flue gases. Combustion air
is not used within the boiler room. All combustion air is from the outdoor source. The vent terminal shall discharge flue
gases away from the building structure so that the flue gases do not cause damage to the building. The vent terminal
locations follow local and national codes requirements.
Combustion
Model
Air required
CFM
ABS 1500
ABS 2000
ABS 2500
ABS 3000
ABS 4000
Based on 45% excess air
DANGER
At the time of removal of any existing boiler is removed from a common vent system, the following steps shall be
performed with each remaining appliance connected to the common vent in operation and not in operation. Seal any
unused opening in the common vent system. This boiler must not be co-vented with a category I or III appliance.
Flue gas Vent ø
Inch
mm
360
10
254
467
10
254
584
10
254
629
10
254
839
10
254
Absolute Boilers ABS 1500-2000-2500-3000-4000
Vent Length
Vent length
[Min]
[Max]
Ft.
m
Ft.
5
1.5
100
5
1.5
100
5
1.5
100
5
1.5
100
5
1.5
100
27
90° Elbow =
Length
m
Ft.
m
1.5
10
3
1.5
10
3
1.5
10
3
1.5
10
3
1.5
10
3
45° Elbow =
Length
Ft.
m
5
1.5
5
1.5
5
1.5
5
1.5
5
1.5
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