A.O. Smith ATX-199 Instruction Manual page 40

WARNING
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CALCULATING GAS LINE SIZE
Gas Meter
10' (3 m ) Length
1" (25 mm) Pipe size
Furnace
120,000 BTU/h
10'(3 m)Length
3/4" (19 mm) Pipe size
Range
65,000 BTU/h
15' (4.6 m) Length
1/2" (25 mm) Pipe size
Figure 45.
1.
3
2.
3.
40
5' (1.5 m) Length
1-1/4" (32 mm) Pipe size
5' (1.5 m)Length
1-1/4"(32 mm) Pipe size
Water Heater
A
199,000 BTU/h
B
10' (3 m) Length
3/4" (19 mm) Pipe Size
15' (4.6 m) Length
1" (25 mm) Pipe size
Dryer
35,000 BTU/h
10' (3 m) Length
1/2" (25 mm) Pipe size
3
Table 19 (page 41)