A higher voltage rating is a suitable upgrade

provided the stem is not excessively pitted

018" diameter aperture

and mineral oils

White-Rodgers 90-291Q Fan Relay A higher voltage rating isThe White Rodgers 90 291Q is a technical grade HVAC fan relay designed for switching single or two speed fan motors, solenoids, and resistive loads in commercial and residential systems. As a Type 84 enclosed relay, it features a Single Pole Normally Open (SPNO) configuration, making it a standard choice for 120V fan relay replacements where reliability is non negotiable. The 120V AC coil operates at a nominal 25 mA with a DC resistance of 2,000 Ohms,