Combustion air supply – Waterpik Technologies LG User Manual
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efficient operation of the heater (See Section 3). An
approved draft hood may be purchased from your local
Jandy distributor. See Section 11 (Parts List) of this
manual for the correct part number for you model and
size heater.
SECTION 3.
Venting
3.1. Combustion Air Supply
The heater location must provide sufficient air
supply for proper combustion and ventilation of the
surrounding area as outlined in the latest edition of
ANSI standard Z223.1 or in Canada, CAN/CSA-
B149.1, and any local codes that may be applicable.
In general, these requirements specify that the
room in which a heater is installed should be provided
with two permanent air supply openings; one within 12
inches (305mm) of the ceiling, the other within 12
inches (305mm) of the floor. All indoor installations
must have openings to outside air for combustion,
ventilation, and dilution of flue gases from inside the
building (see Figure 5 and Table 3). Water Pik Tech-
nologies does not recommend indoor installations that
do not provide combustion air from outside the build-
ing.
All outdoor shelter installations (Canada only)
must have uninterrupted openings to outside air for
combustion and ventilation. The installation must be in
accordance with the latest edition of CAN/CSA-
B149.1. Water Pik Technologies does not recommend
outdoor shelter installations that depend on internal air
for combustion. Combustion air should be ducted to the
heater from outside the structure.
Outside Air Supply: When combustion air is
supplied directly through an outside wall, each opening
should have a minimum free area of one square inch
per 4,000 BTU/h (1.2kW) input of the total input rating
of all appliances in the enclosed area. If air is provided
through horizontal ducts, each opening and duct must
provide one square inch of flow area for each 2000
BTU/h (0.6 kW). These requirements are summarized
in Table 3. Note that the areas specified are net free
areas and should be increased by 50 percent when the
openings are covered by screens, louvers, grills or
other protective covers (see Figure 5 and Table 3).
Note: In Canada, follow Canadian Standard,
CAN/CSA-B149.1 or local codes.
Exhaust Fans or Vents: Any equipment which
Table 3. Air Openings to Outside.
Required Net Free Open Area*
for Combustion Air Openings
Direct from outside
Duct from outside
Model
in
2
(cm
2
)
in
2
(cm
2
)
125
32
(206)
64
(413)
175
44
(284)
88
(568)
250
63
(406)
126
(813)
325
82
(429)
164
(1058)
400
100
(645)
200
(1290)
*Area indicated is for one of two openings; one at floor level and
one at the ceiling, so the total net free area would be double the
figures indicated. For special conditions, refer to NFPA54/ANSI
Z223.1. In Canada refer to the National Standard CAN/CSA-
B149.1 which differs from this table.
Note: If using screens and/or metal louvers, compensate by adding
50% additional area to each opening
If using wood louvers each opening must be at least four times
the area indicated in the table above.
Notes:
1. An Underwriters' Laboratories or equivalent Nationally Recognized Testing Laboratory listed vent cap is required to
prevent downdraft and allow the heater to function properly and safely.
2. Use approved roof jack.
Figure 5. Indoor Installation Venting (USA), or Outdoor Shelter (Canada).