On most gas furnaces

Trane specifies the FLR8618 to balance filtration and static pressure

this is a single-speed motor optimized to run at a constant 1075 RPM to provide the specific CFM required for the heat transition across the condenser coils

This 1/2 HP replacement motor operates at a fixed 1050 RPM

Equipped with a nitrile seal material (Buna-N)

Siemens Combustion AGA29 Spring 320720-756 On most gas furnacesThe Siemens AGA29 is a technical grade setpoint spring engineered for precision pressure regulation within Siemens SKP20, SKP25, and SKP26 series gas valve actuators. As a veteran preferred component for combustion control systems, this unpainted pressure regulator spring provides a standard setpoint range of 0 to 8. 5 inches water column (0. 5 to 22 mbar), ensuring stable fuel to air ratios in residential and industrial burner applications.