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COMBUSTION AND VENTILATION AIR SUPPLY
CAUTION: Combustion air must not be contaminated by corrosive chemical fumes which can damage the heater
and void the warranty.
IMPORTANT: Adequate air must be provided for proper combustion and ventilation of the surrounding area. An
inadequate supply of combustion air will result in incomplete combustion and eventual sooting of the heater.
Insufficient ventilation will cause excessive heat and rapid deterioration of electronic and electrical components.
Equipment rooms should be provided with TWO permanent air supply openings directly connected to outside air.
Each opening must have a minimum FREE area of one square inch per 4000 BTU per hour input of the total input
rating of all equipment in the room. Local codes or authorities having jurisdiction should be consulted for the following
table.
RECOMMENDED MINIMUM AIR OPENINGS
BOILER
SIZE
136
181
264
331
399
All area shown in square inches
For other conditions refer to the latest edition of the National Fuel Gas Code ANSI Z 223.1. Net free area, sq. in.
requires data from louver manufacturer based on resistance of screening, if provided.
OUTDOOR INSTALLATIONS
MODEL 136
Step 1: Remove the front (4) screws
Step 2: Line up outdoor top vent opening over heater
vent opening.
Step 3: Lower outdoor top onto unit lining up slots in the
outdoor top with screws holes in jacket top.
Step 4: Reinstall (5) screw to secure jacket top and
outdoor top to unit.
NET
FREE
BOILER
AREA
SIZE
34
512
47
627
66
726
84
825
100
962
Fig. # 8114
NET
FREE
BOILER
AREA
SIZE
128
1125
157
1223
182
1337
207
1467
241
1630
1826
MODEL 181-399
VENT TERMINAL (Outdoor) Stackless Top Installation
1. Insert tabs into keyhole (4 places).
10
NET
FREE
AREA
282
306
335
367
408
457
Pagoda Top
(Shipped
Loose with
Heater)
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