9
a. All Air From Inside The Building:
Each opening shall have a minimum net free
square inches as noted in Table E.
b. All Air From Outdoors:
When air is supplied directly from outside of build-
ing, each opening shall have a minimum net free
square inches as noted in Table F.
CAUTION:
Combustion air must not be
contaminated by corrosive chemical fumes which
can damage the boiler and void the warranty.
Model
Sq. Inches
Model
Sq. Inches
133
136
1125
1125
182/181
181
1223
1223
260/261
264
1336
1337
330/331
334
1468
1467
400/401
399
1631
1630
514
512
1826
1826
624
627
2100
2100
724
726
2500
2499
824
825
3001
3000
962
962
3500
3500
4001
4000
Model
Sq. Inches
Model
Sq. Inches
133
34
1125
282
182/181
46
1223
306
260/261
66
1336
335
330/331
84
1468
367
400/401
100
1631
408
514
128
1826
457
624
157
2100
525
724
182
2500
625
824
207
3001
750
962
241
3500
875
4001
1000
Table E: Minimum Net Free Air from Inside Building
Table F: Minimum Net Free Air from Outside Building
Venting
Outdoor Installations
Model 133
1. Remove the front (4) screws.
2. Line up outdoor top vent opening over heater vent
opening.
3. Lower outdoor top onto unit lining up slots in the
outdoor top with screw holes in jacket top.
4. Reinstall (5) screws to secure jacket top and out-
door top to unit.
Models 181-401 & 182-400
Outdoor Top Installation
Fig. 4: Installing Outdoor Top—Model 133
(Part of heater)
Fig. 5: Installing Outdoor Top—Models 181-401 & 182-
400