Crown Boiler AWR Series Installation Instructions Manual page 55

Gas-fired natural draft hot water boilers
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Table A2: AWR Series Orifice Sizes at Various Altitudes
Nominal Altitude
Orifice size
0ft - Tested
46
Sea Level
47
2000
47
3000
47
4000
47
5000
48
6000
48
7000
49
8000
49
9000
50
10000
50
Natural Gas
Crown PN
Orifice size
950303
950303
950303
950303
950304
950304
950305
950305
950306
950306
55
Propane
Crown PN
1.25mm
1.20mm
950346
1.20mm
950346
1.20mm
950346
56
950331
57
950332
57
950332
57
950332
57
950332
58
950333
59
950334

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