Abstract: A plenum slot diffuser includes a plenum box having five walls formed by joining edges of a C-shaped bracket having first, second, and third walls of the five walls with additional edges of an L-shaped bracket having fourth and fifth walls of the fives walls. An air input opening of the plenum box is disposed in one of the five walls and is configured to be coupled to a duct, and an open end of the plenum box defines an air output opening. The plenum slot diffuser includes at least one blade and a blade holding rod comprising a neck, wherein the neck faces away from the air output opening of the plenum box.

Abstract: An exhaust fan unit of a heating, ventilation, and/or air conditioning (HVAC) system includes an outer fluid path of a nozzle assembly of the exhaust fan unit defined by and between an outer wall of the nozzle assembly and an inner wall of the nozzle assembly, an inner fluid path of the nozzle assembly defined by and radially inward from the inner wall, and a plurality of entrainment ports extending from the outer wall to the inner wall and configured to enable environmental air to pass to the inner fluid path, where each entrainment port includes a bottom surface that tapers downwardly from the inner wall to the outer wall.

Abstract: An exhaust fan unit of a heating, ventilation, and/or air conditioning (HVAC) system includes an outer fluid path of a nozzle assembly of the exhaust fan unit defined by and between an outer wall of the nozzle assembly and an inner wall of the nozzle assembly, an inner fluid path of the nozzle assembly defined by and radially inward from the inner wall, and a plurality of entrainment ports extending from the outer wall to the inner wall and configured to enable environmental air to pass to the inner fluid path, where each entrainment port includes a bottom surface that tapers downwardly from the inner wall to the outer wall.

Abstract: An exhaust fan unit of a heating, ventilation, and/or air conditioning (HVAC) system includes an outer fluid path of a nozzle assembly of the exhaust fan unit defined by and between an outer wall of the nozzle assembly and an inner wall of the nozzle assembly, an inner fluid path of the nozzle assembly defined by and radially inward from the inner wall, and a plurality of entrainment ports extending from the outer wall to the inner wall and configured to enable environmental air to pass to the inner fluid path, where each entrainment port includes a bottom surface that tapers downwardly from the inner wall to the outer wall.

Abstract: A fan assembly for a heating, ventilation, and/or air conditioning (HVAC) unit includes a hub having a fan blade extending therefrom. The fan assembly includes a fan pitch adjuster configured to engage the fan blade and to adjust a pitch of the fan blade relative to the hub in response to movement of the fan pitch adjuster relative to the hub. The fan assembly also includes a motor shaft coupled to the fan pitch adjuster and to the hub, where the motor shaft is configured to drive rotation of the fan pitch adjuster and the hub. The fan assembly further includes an actuator coupled to the fan pitch adjuster and configured to axially move the fan pitch adjuster along the motor shaft and relative to the hub to adjust the pitch of the fan blade.

Abstract: An exhaust fan unit of a heating, ventilation, and/or air conditioning (HVAC) system includes an outer fluid path of a nozzle assembly of the exhaust fan unit defined by and between an outer wall of the nozzle assembly and an inner wall of the nozzle assembly, an inner fluid path of the nozzle assembly defined by and radially inward from the inner wall, and a plurality of entrainment ports extending from the outer wall to the inner wall and configured to enable environmental air to pass to the inner fluid path, where each entrainment port includes a bottom surface that tapers downwardly from the inner wall to the outer wall.

Abstract: A fan assembly for a heating, ventilation, and/or air conditioning (HVAC) unit includes a hub having a fan blade extending therefrom. The fan assembly includes a fan pitch adjuster configured to engage the fan blade and to adjust a pitch of the fan blade relative to the hub in response to movement of the fan pitch adjuster relative to the hub. The fan assembly also includes a motor shaft coupled to the fan pitch adjuster and to the hub, where the motor shaft is configured to drive rotation of the fan pitch adjuster and the hub. The fan assembly further includes an actuator coupled to the fan pitch adjuster and configured to axially move the fan pitch adjuster along the motor shaft and relative to the hub to adjust the pitch of the fan blade.