Rheem 136-1826 User Manual
Page 10
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
NET
NET
NET
BOILER
FREE
BOILER
FREE
BOILER
FREE
SIZE
AREA
SIZE
AREA
SIZE
AREA
136
34
512
128
1125
282
181
47
627
157
1223
306
264
66
726
182
1337
335
331
84
825
207
1467
367
399
100
962
241
1630
408
All area shown in square inches
1826
457
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.
Fig. # 8114
10
MODEL 181-399
VENT TERMINAL (Outdoor) Stackless Top Installation
1. Insert tabs into keyhole (4 places).
Pagoda Top
(Shipped
Loose with
Heater)