The FB is a part-turn cast iron gearbox suitable for use with fire protection (sprinkler) systems. It includes limit switches to be incorporated into a supervisory electrical circuit, and is designed and tested specifically to meet UL1091 specification and FM1112 approval.
| Torque Range | Up to 1,000 Nm (737 lbf.ft) |
| Ratios | 40:1 to 60:1 |
| Construction | Worm gear, manual drive |
| Overload Capacity | 3 x overload capacity |
| Cycles | 1,000 cycles |
| Specification and Approval | UL1091 specification and FM1112 approval |
| Limit Switches | Includes limit switches to be incorporated into a supervisory electrical circuit |