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 nozzle assembly for a fan unit includes an inner nozzle having a tapered outer diameter and a flow path radially inward from the tapered outer diameter with respect to a longitudinal axis of the nozzle assembly. The flow path is configured to guide a fluid flow and to expel the fluid flow through an inner outlet of the inner nozzle to a surrounding environment. The nozzle assembly also includes an outer nozzle disposed radially outward from the inner nozzle with respect to the longitudinal axis. The outer nozzle and the tapered outer diameter of the inner nozzle define an annular flow path therebetween. The annular flow path is configured to guide the fluid flow and to expel the fluid flow to the surrounding environment through an outer outlet of the outer nozzle. A cross-sectional area of the outer outlet is adjustable via movement of the inner nozzle, the outer nozzle, or both along the longitudinal axis of the nozzle assembly.

Abstract: A nozzle assembly for a fan unit includes an inner nozzle having a tapered outer diameter and a flow path radially inward from the tapered outer diameter with respect to a longitudinal axis of the nozzle assembly. The flow path is configured to guide a fluid flow and to expel the fluid flow through an inner outlet of the inner nozzle to a surrounding environment. The nozzle assembly also includes an outer nozzle disposed radially outward from the inner nozzle with respect to the longitudinal axis. The outer nozzle and the tapered outer diameter of the inner nozzle define an annular flow path therebetween. The annular flow path is configured to guide the fluid flow and to expel the fluid flow to the surrounding environment through an outer outlet of the outer nozzle. A cross-sectional area of the outer outlet is adjustable via movement of the inner nozzle, the outer nozzle, or both along the longitudinal axis of the nozzle assembly.

Abstract: Embodiments of the present disclosure are directed to an inline centrifugal mixed flow fan system that includes a wheel assembly disposed within an outer housing and comprising a hub cone, a plurality of fan blades directly coupled to and extending radially outward from the hub cone, and a shroud directly coupled to and at least partially radially surrounding the plurality of fan blades. The wheel assembly is configured to receive an air flow at an inlet axial end of the outer housing axially upstream of the wheel assembly, and to redirect the air flow axially downstream relative to a central longitudinal axis, circumferentially about the central longitudinal axis, and radially outward from the central longitudinal axis.

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 adjustable neck for a vent cap includes a housing having a mount and a cylindrical body, where the cylindrical body includes an inner surface. The adjustable neck also includes adjustable straps arranged to form an adjustable inner diametrical surface disposed radially inward from the cylindrical body of the housing, relative to a central axis of the adjustable neck. The adjustable inner diametrical surface is configured to engage an outer pipe surface. The adjustable straps are coupled to the inner surface of the cylindrical body. The adjustable neck also includes legs coupled to the adjustable straps and to the mount, where the cylindrical body is configured to be rotated relative to the mount and the legs to adjust a dimension of the adjustable inner diametrical surface to correspond to the outer pipe surface.

Abstract: Embodiments of the present disclosure are directed to an inline centrifugal mixed flow fan system that includes a wheel assembly disposed within an outer housing and comprising a hub cone, a plurality of fan blades directly coupled to and extending radially outward from the hub cone, and a shroud directly coupled to and at least partially radially surrounding the plurality of fan blades. The wheel assembly is configured to receive an air flow at an inlet axial end of the outer housing axially upstream of the wheel assembly, and to redirect the air flow axially downstream relative to a central longitudinal axis, circumferentially about the central longitudinal axis, and radially outward from the central longitudinal axis.

Abstract: A nozzle assembly for a fan unit includes an inner nozzle having a tapered outer diameter and a flow path radially inward from the tapered outer diameter with respect to a longitudinal axis of the nozzle assembly. The flow path is configured to guide a fluid flow and to expel the fluid flow through an inner outlet of the inner nozzle to a surrounding environment. The nozzle assembly also includes an outer nozzle disposed radially outward from the inner nozzle with respect to the longitudinal axis. The outer nozzle and the tapered outer diameter of the inner nozzle define an annular flow path therebetween. The annular flow path is configured to guide the fluid flow and to expel the fluid flow to the surrounding environment through an outer outlet of the outer nozzle. A cross-sectional area of the outer outlet is adjustable via movement of the inner nozzle, the outer nozzle, or both along the longitudinal axis of the nozzle assembly.

Abstract: An adjustable neck for a vent cap includes a housing having a mount and a cylindrical body, where the cylindrical body includes an inner surface. The adjustable neck also includes adjustable straps arranged to form an adjustable inner diametrical surface disposed radially inward from the cylindrical body of the housing, relative to a central axis of the adjustable neck. The adjustable inner diametrical surface is configured to engage an outer pipe surface. The adjustable straps are coupled to the inner surface of the cylindrical body. The adjustable neck also includes legs coupled to the adjustable straps and to the mount, where the cylindrical body is configured to be rotated relative to the mount and the legs to adjust a dimension of the adjustable inner diametrical surface to correspond to the outer pipe surface.