10
ROOF VENTING CAP USED FOR INLET AIR MUST BE
6 IN. (15 CM) HIGHER THAN SHOW DEPTH.
COMBUSTION AIR SUPPLY PIPING
4 IN. (10 CM) I.D. (BY OTHERS)
SUPPORT AS NEEDED
ROOF VENTING
CAP 4 IN.
(10 CM) I.D.
INLET AIR
SLEEVE
ACCESSORY
(SEAM TO BE
AT TOP)
COMBUSTION AIR SUPPLY
PIPING 4 IN. (10 CM) I.D.
(BY OTHERS) SUPPORT
AS NECESSARY
FLEX DUCT ACCESSORY
4 IN. (10 CM) I.D.
18 IN. (46 CM) LONG
INLET AIR WALL CAP
ACCESSORY REQUIRES
4" B-VENT ADAPTOR
(BY OTHERS)
INLET AIR SLEEVE ACCESSORY
(SEAM TO BE AT TOP)
INLET AIR
COLLAR
TWO HOSE CLAMPS
COMBUSTION AIR SUPPLY
GENERAL NOTES
MAXIMUM LENGTH OF AIR SUPPLY PIPE
•
Uncontaminated atmospheric air for
combustion may come from either outdoors or
indoors (from within the building).
•
Installation of combustion air supply must
comply with the instructions, drawings, and
installation notes provided in this section.
OUTDOOR AIR SUPPLY
40 to 125 MBTUH (12 – 37 kW)
35
linear ft. (10.7 m)*
130 to 200 MBTUH (38 – 59 kW)
40
linear ft. (12.2 m)*
*Each 90 degree elbow inserted in the venting system
is equivalent to 10 linear ft. (3.0 m).
*Each 45 degree elbow inserted in the venting system
is equivalent to 5 linear ft. (1.5 m).
A maximum of
two
90 degree elbows or their equivalent are allowed (e.g. one 90
degree elbow plus two 45 degree elbows; or four 45 degree elbows, etc.)
OUTDOOR AIR SUPPLY THRU-THE-ROOF
OUTDOOR AIR SUPPLY THRU-THE-WALL
•
Uncontaminated atmospheric air for
combustion may come from either outdoors or
indoors (from within the building).
•
Installation of combustion air supply must
comply with the instructions, drawings, and
installation notes provided in this section.
•
In buildings contaminated with excessive dust
or dirt, or containing substances which when
combined with flame and exhaust products
result in corrosive gasses or those under a
negative pressure, or high humidity areas,
combustion air must come from outdoors.
•
Outdoor air supply may be accomplished by
bringing in air through piping from either the
roof or wall as the drawings illustrate.
•
When combustion air is supplied from outdoors,
the heater must also be vented to the outdoors
(
EXCEPT
high humidity environments consult
factory).
•
The roof venting cap used for inlet air cap
(roof), inlet air wall cap or inlet air box (wall)
must be located at least three (3) feet (.91 m)
away from any vent termination and in a
manner to prevent blockage by snow.
•
Components supplied by others must be
identical to those specified in this manual and
be Metalbestos brand, or equal, for the roof
vent cap; and Simpson Dura-Vent, or equal, for
the wall vent cap.
NO SUBSTITUTIONS
.
•
Single wall 4” (10.2 cm) I.D., 26-gauge (.044
cm) minimum stainless or galvanized sheet
metal pipe or schedule 40 PVC is
recommended for combustion air supply piping.
•
It may be desirable to insulate piping with 1
inch (2.54 cm) of pipe insulation to eliminate
condensation from warm inside air.
•
DO NOT use collapsible material for
combustion air supply, as it will restrict the
proper amount of combustion air from being
supplied to the burner.
•
An optional blower enclosure extends the
burner housing to enclose the blower. The
outdoor air piping is then attached to the
enclosure, isolating the outside of the blower
and motor from contaminants.
INDOOR AIR SUPPLY
•
When combustion air is to be taken from inside
a tightly closed building, an opening to the
outdoors must be installed to supply the burner
with sufficient air for combustion.
•
For every 4,000 BTUH (1.17 kW) input of the
total input of
ALL
gas-fired equipment, one (1)
square inch (6.45 cm
2
) or more of free area
opening must be provided.
•
The openings should be located above the
heaters to reduce the effect of drafts.
•
Do not draw combustion air into the heater from
attic space or another tightly closed room.
There is no guarantee adequate air will be
supplied
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