GAS PIPE SIZING
To provide adequate gas pressure to the gas unit,
size the gas piping as follows:
1. Find the cu. ft./hr. by using the following formula:
Cu. ft./hr. =Input
2. Refer to Table 1. Match “Length of Pipe in Feet”
with appropriate “Gas Input - Cu. Ft./Hr.” figure.
This figure can then be matched to the pipe size at
the top of the column.
It is determined that a 67 foot (20.4m) run of gas
pipe is required to connect a 75 MBTU gas unit
heater to a 1,000 BTU/cu ft. (0.29kW) natural gas
1,000 BTU/cu. ft.= 75 Cu. ft./hr.
Using Table 1, a 3/4 inch pipe is needed.