Absolute ABS-1500 - Page 27

Absolute Boilers ABS 1500-2000-2500-3000-4000
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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 ue 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 ue gases. Combustion air
is not used within the boiler room. All combustion air is from the outdoor source. The vent terminal shall discharge ue
gases away from the building structure so that the ue gases do not cause damage to the building. The vent terminal
locations follow local and national codes requirements.
Model
Combustion
Flue gas Vent ø
Vent Length
[Min]
Vent length
[Max]
90° Elbow = 45° Elbow =
Air required
CFM
Length Length
Inch mm Ft. m Ft. m Ft. m Ft. m
ABS 1500 360 10 254 5 1.5 100 1.5 10 3 5 1.5
ABS 2000 467 10 254 5 1.5 100 1.5 10 3 5 1.5
ABS 2500 584 10 254 5 1.5 100 1.5 10 3 5 1.5
ABS 3000
629 10 254 5 1.5 100 1.5 10 3 5 1.5
ABS 4000
839 10 254 5 1.5 100 1.5 10 3 5 1.5
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.