| Part Number | Sensors | Inlet | Outlet | Angle | Additional Info |
| BN-509B | w/out sensor | 5 bolt inlet | 3 bolt outlet | 70 degree angle | 10" length longest side, w/bends |
| BN-509C | 1/2" heat sensor opening | 5 bolt inlet | 3 bolt outlet | 70 degree angle | 12 3/4" length longest side, w/bends |
Measurements Required
with or w/out air; with or w/out sensor; 1/2" or 3/4" sensor; rear flange at 45 or 70 degree angle; 2 bolt or 3 bolt outlet; overall length;