Gas Line Sizing
Maximum Equivalent Pipe Length ft (m)
Natural Gas 1000 BTU/FT
3
0.60 Specific Gravity @ 0.5 in. WC Pressure Drop
Propane Gas 2500 BTU/FT
3
1.53 Specific Gravity @ 0.5 in. WC Pressure Drop
Model No.
Size 3/4”
Size 1”
Size 1-1/4”
Size 1-1/2”
NAT PRO NAT PRO NAT
PRO
NAT
PRO
264
15
(4.6)
35
(10.7)
50
(12.2)
125
(38.1)
210
(64.0)
480
(146.3)
445
(135.6)
404
*
15
(4.6)
20
(8.8)
55
(16.8)
95
(29.0)
225
(68.6)
215
(65.5)
280
(85.3)
GAS SUPPL
Y
EFFECTS OF LOW GAS PRESSURE
• Pulsating burner flame/Flame lost
• Delayed Ignition/Hard light off
• Exposure to condensation
• Emissions not at compliance levels
• Damage burner
• Sooting
• Ignition failure
7
*A 3/4” gas line can be used for up to 5’ (1.5 m) maximum length from the gas valve in addition to the sediment trap.