Tjernlund 950-0474 Combustion Air Intake Fan Prover KitCombustion Air Intake Fan Prover Kit from Tjernlund (model 950 0474) provides precise airflow verification for combustion air systems. Designed for use on PAI 4 Combustion Air Intake Equipment, this prover kit streamlines installation, testing, and maintenance, delivering reliable performance in demanding field environments. Built to withstand industrial settings, it ensures repeatable results technicians can trust during commissioning and service

making this a trusted McDonnell & Miller replacement part for SA63-30 applications

dependable control for 2-Way motorized zone valves

Built for durability in heating equipment

Ideal for completing repairs with authentic Armstrong components

6-pole blower is designed for use in multi-position air handlers

and connects via 5/32" OD dual barbed fittings or 1/4" OD plastic tubing

and consistently compliant results across residential and commercial applications

providing robust

Armstrong 12W64 Furnace Ignition/Fan Control Board delivers reliable ignition and precise fan control for your heating system

this actuator runs on 208 Volt AC with 50/60 Hz and draws only 6

making it a practical choice for homeowners and HVAC pros alike

With a forged brass body and nickel-plated stem