The Fasco 7190-2773 is a single-phase, permanent split capacitor (PSC) fan motor built as a direct OEM-equivalent replacement for Greenheck ventilation equipment. Running at 1,100 RPM on 115V/60Hz power, this compact 3.3-inch diameter motor features dual shafts for balanced fan blade mounting, automatic overload protection, and Class B insulation rated for continuous duty up to 104 deg F (40 deg C) ambient. Also catalogued under NBK Parts number 20528.
When a Greenheck exhaust or supply fan motor fails, this Fasco 7190-2773 is the go-to direct substitute. It matches the original mounting footprint, shaft dimensions, and electrical characteristics so you can swap motors without re-engineering the fan assembly. Sleeve bearings keep operation smooth and quiet; automatic thermal overload protection guards the motor from burnout if airflow is blocked or the load spikes unexpectedly.
The open enclosure design is typical for this class of ventilation motor -- it allows airflow through the motor for cooling but means this unit should not be exposed to water, grease, or heavy particulate environments without proper housing protection already supplied by the fan unit itself.
PSC design delivers efficient, single-speed operation with better running efficiency than shaded-pole alternatives. Capacitor sold separately if not included with original assembly.
Shafts extend from both ends of the motor at 4-19/32" length and 3/8" diameter, allowing fan blades or pulleys to be mounted on either or both sides of the motor body.
Built-in thermal overload protector shuts the motor down if it overheats, then resets automatically once it cools -- protecting the windings and extending service life.
Class B winding insulation is rated to 130 deg C rise, well suited for continuous-duty commercial ventilation applications in ambient temperatures up to 104 deg F (40 deg C).
This motor is listed as a direct replacement for Greenheck part number 304970. Greenheck uses this motor family in a range of ceiling and wall exhaust fans. Verify your existing motor's voltage (115V), RPM (1100), amperage (3.5A), shaft diameter (3/8"), and overall diameter (3.3") against your unit's nameplate before ordering.
Before installation, confirm the capacitor rating of your existing PSC motor -- PSC motors require a run capacitor matched to the motor's specifications. The capacitor is typically mounted separately in the fan housing and may be reusable if it tests within spec. If the original capacitor failed alongside the motor, replace both.