ORIFICE SIZING CHART

CAPACITIES SHOWN IN BTU/HR. Natural Gas - 1050 BTU/Cu. Ft.- 3.5 Pressure

Propane Gas - 2500 BTU/Cu. Ft.- 11.0 Pressure

BTU            DRILL SIZE         
            NAT GAS    PROP. GAS
5,000.........56...........71     
10,000........52...........62     
15,000........48...........56     
20,000........43...........54     
25,000........40...........53     
30,000........36...........51     
35,000........32...........50     
40,000.......1/8...........48     
45,000........30...........46     
50,000......9/64...........44    
57,000........27...........43     
60,000........24...........42     
65,000......5/32...........41     
70,000........20...........39     
75,000........18...........37     
80,000........17...........36     
85,000........15...........35     
90,000........13...........33     
95,000........12...........32     
100,000........9...........31     
110,000........6...........31     
120,000.......13...........30     
125,000.....7/32...........30     

BTU            DRILL SIZE         
            NAT GAS    PROP. GAS
130,000.........2...........29     
140,000.........1...........28     
150,000.........A...........26     
160,000.........C...........34     
170,000.........D...........23     
175,000.......1/4...........23     
180,000.........F.........5/32     
190,000.........G...........21     
195,000.....17/64...........19     
200,000.........H...........19     
210,000.........J...........18     
225,000......9/32...........17     
250,000.....19/64...........14     
260,000......5/16...........11     
285,000.....21/64............8     
300,000.....11/32............6     
350,000.....23/64............2     
375,000.......3/8............1     
400,000.....25/64........15/64     
450,000.....13/32..........1/4     
475,000.....27/64........17/64     
500,000.....17/64........17/64