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SlimFit
®
Series 2
Venting/combustion air — general
There are two venting
methods available.
Follow the instructions
on the following pages
for the method used.
SlimFit boilers must be vented and sup-
plied with combustion and ventilation air
using piping and methods described in
this manual.
DO NOT COMMON VENT Category IV
boilers.
Every boiler must have its own vent.
DO NOT common vent with any other appli-
ance. See page 26 for checking appliances
remaining on a common vent.
INSPECT VENT/AIR COMPONENTS
Inspect finished vent and air piping thor-
oughly to ensure all are airtight and comply
with the instructions provided and with all re-
quirements of applicable codes. Verify all air
openings are correctly sized, unobstructed,
and free of airborne contaminants.
Failure to provide a properly-installed vent
and air system will cause severe personal
injury or death.
DO NOT INSULATE NONMETALLIC VENT
PIPE
Do not cover nonmetallic vent pipe with thermal
insulation.
Code compliance
Venting/combustion air piping - Installations
must provide provisions for combustion and
ventilation air in accordance with the sec-
tion "Air for Combustion and Ventilation," of
the National Fuel Gas Code - ANSI Z223.1/
NFPA54 – latest edition, or Sections 8.2, 8.3,
or 8.4 of Natural Gas and Propane Installation
Code - CAN/CSA B149.1, or applicable provi-
sions of the local building codes.
Air openings for direct exhaust
1. Combustion air must be supplied through openings into
the boiler room, following the instructions in this manual,
and compliant with all applicable codes. Combustion air
must not be exposed to any of the contaminants listed in
Figure 21, page 24, and ensure the air and boiler room will
not contain contaminated air.
2. Where the SlimFit boiler shares a space with other appli-
ances, the combustion air openings must be sized to handle
the combined requirements of all appliances in the space.
Part number 550-100-561/0224
commercial condensing gas
Method 1: Direct exhaust
• Combustion air taken from inside
(no air piping connected to air
intake)
• Sidewall or vertical termination
-
— Boiler Manual
fired water boiler
Vent and air piping materials
Use only the materials listed in this manual
(Figure 22, page 25) for vent and air pipe and
fittings.
A masonry chimney can ONLY be used as a chase
for vent and air piping
If used, a masonry chimney can ONLY be
used as a PIPE CHASE for vent and air
pipes — The vent and air piping must be
installed as instructed in this manual and all
joints must be sealed. The chimney must be
used only as a chase for the SlimFit boiler vent/
air piping. NO OTHER appliance or fireplace
can be connected to the chimney.
The chimney must be straight, with no offsets,
and the vent and air piping materials must
comply with this instruction manual.
The chimney must be fitted with a sealed ac-
cess opening, through which the interior of the
chimney can be inspected.
The chimney and liner must be inspected at
least once annually to verify condition.
Failure to comply could result in severe per-
sonal injury, death or substantial property
damage.
Combustion air piping for direct vent
1. Combustion air must be piped from outside to the boiler,
following the instructions in this manual, and compliant
with all applicable codes. Read the warning in Figure 21,
page 24, and ensure the air intake will not be likely to draw
in contaminated air.
2. Combustion air can be piped individually for each boiler,
or it can be manifolded as shown in Figure 31, page 36.
Combustion/ventilation openings may also be required in
boiler room walls, per instructions in this manual and ap-
plicable codes.
Method 2: Direct vent
• Combustion air piped to boiler from
outside
• Sidewall or vertical termination
23
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