Nu West Leda Fcv 150 -

Based on the naming convention, this is most likely a for an industrial component—possibly a filter, valve, or hydraulic/pneumatic component (FCV often stands for Flow Control Valve).

: It utilizes a primary air intake control, allowing the user to regulate the burn rate. High-efficiency models of this era often incorporated a "secondary burn" system to ignite unburned gases, reducing smoke and increasing heat output. Installation and Safety Nu West Leda Fcv 150