Orifice Sizing Chart
| Orifice | BTU | ||
| No. | Size | Nat. | LP |
| 67 | .0320 | 2600 | 7153 |
| 66 | .0330 | 2765 | 7607 |
| 65 | .0350 | 650 | 1788 |
| 64 | .0360 | 3291 | 9053 |
| 63 | .0370 | 3476 | 9563 |
| 62 | .0380 | 3666 | 10087 |
| 61 | .0390 | 3862 | 10625 |
| 60 | .0400 | 4062 | 11176 |
| 59 | .0410 | 4268 | 11742 |
| 58 | .0420 | 4479 | 12322 |
| 57 | .0430 | 4695 | 12916 |
| 56 | .0465 | 5490 | 15104 |
| 55 | .0520 | 6865 | 18888 |
| 54 | .0550 | 7680 | 21131 |
| 53 | .0595 | 8989 | 24730 |
| 52 | .0635 | 10238 | 28167 |
| 51 | .0670 | 11398 | 31357 |
| 50 | .0700 | 12441 | 34228 |
| 49 | .0730 | 13530 | 37225 |
| 48 | .0760 | 14665 | 40347 |
| 47 | .0785 | 15646 | 43045 |
| 46 | .0810 | 16658 | 45831 |
| 45 | .0820 | 17071 | 46969 |
| 44 | .0860 | 18778 | 51663 |
| 43 | .0890 | 20111 | 55331 |
| 42 | .0935 | 22197 | 61067 |
| 41 | .0960 | 23399 | 64377 |
| 40 | .0980 | 24384 | 67087 |