|
This chart will give you the
cubic feet of gas required. Use the formula below to get the proper sizing
from chart. Cubic Feet
of Gas Required = Gas Input of Unit (BTU/HR) / 1000 BTU/HR (Heating Value of Natural
Gas) Example: Assume
60,000btu furnace and we have to go 40 feet. Take 60,000 / 1000 = 60 cubic ft
of gas required; therefore 1/2 inch pipe will make it (See 63 in red on the chart)
| Pipe Size |
Length Of
Pipe In Feet |
| |
10 ft. |
20 ft. |
30 ft. |
40 ft. |
50 ft. |
60 ft. |
70 ft. |
80 ft. |
1/2 |
132 |
92 |
73 |
63 |
56 |
50 |
46 |
43 |
3/4 |
278 |
190 |
152 |
130 |
115 |
105 |
96 |
90 |
1 |
520 |
350 |
285 |
245 |
215 |
195 |
180 |
170 |
1
1/4 |
1050 |
730 |
590 |
500 |
440 |
400 |
370 |
350 |
1
1/2 |
1600 |
1100 |
890 |
760 |
670 |
610 |
560 |
530 |
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