11
INDOOR STACK KIT
(1) Drafthood, unpainted
(1) Adapter plate
(3) Mounting brackets (clips)
(3) Screws
(1) Instructions
Clips
Figure 8. Indoor Stack Kit Components
Combustion and Ventilation Air
Indoor Units Only
The heater must have both combustion and ventilation
air. The minimum requirements are listed in the latest
edition of the National Fuel Gas Code (U.S. ANSI Z223.1
or Canada CAN/CSA-B149) and any local codes that
may have jurisdiction. The most common approach is
the "2-opening" method, with combustion air opening no
more than 12" from the oor and the ventilation opening
no more than 12" from the ceiling. For opening sizes using
this method, see below.
All Air from Inside the Building:
Each opening shall have a minimum net free area as
noted:
Model Sq. in. (m
2
)
207A 200 (0.13)
267A 266 (0.17)
337A 333 (0.21)
407A 399 (0.26)
Table E. Opening Minimum Net Free Requirements -
Indoor Air
All Air from Outdoors:
When air is supplied directly from outside the building, each
opening shall have a minimum net free area as noted:
Model
Unrestricted
Opening
sq. in. (m
2
)
Typical Screened
or Louvered
Opening
sq. in. (m
2
)
Typical Screened
and Louvered
Opening
sq. in. (m
2
)
207A 50 (0.03) 75 (0.05) 100 (0.1)
267A 67 (0.04) 101 (0.06) 134 (0.09)
337A 84 (0.05) 126 (0.08)
168 (0.11)
407A 100 (0.06) 150 (0.1)
200 (0.13)
Table F. Opening Minimum Net Free Requirements -
Outdoor Air
AA
CAUTION: Combustion air must not be contaminated
by corrosive chemical fumes which can damage the
heater. Such damage will not be covered by the warranty
6000.592_PoolSpa_LoNOx.indd 11 10/21/2019 2:23:45 PM
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