Exhaust fan

Abstract

A fan comprising a motor, an impeller, a curb cap, a support pan, a first conduit, and a second conduit. The impeller is rotatably coupled to the motor about a longitudinal axis. The curb cap is configured for interaction with a roof curb. The curb cap includes an airflow opening, a first conduit opening, and a second conduit opening. The support pan supports the motor. The first electrically insulative conduit extends between the support pan and the first conduit opening along a first conduit axis. The second electrically insulative conduit extends between the support pan and the second conduit opening along a second conduit axis. In a plane perpendicular to the longitudinal axis, a central angle between the first conduit axis, the longitudinal axis, and the second conduit axis is greater than or equal to ninety degrees and less than or equal to one hundred and eighty degrees.

What is claimed is: 
     
         1 . An exhaust fan comprising:
 a motor,   an impeller rotatably coupled to the motor about a longitudinal axis,   a curb cap configured for interaction with a roof curb, the curb cap including,
 an airflow opening, 
 a first conduit opening, and 
 a second conduit opening, 
   a support pan supporting the motor,   a first conduit extending between the support pan and the first conduit opening along a first conduit axis, and   a second conduit extending between the support pan and the second conduit opening along a second conduit axis,   wherein in a plane perpendicular to the longitudinal axis, a central angle between the first conduit axis, the longitudinal axis, and the second conduit axis is greater than or equal to ninety degrees and less than or equal to one hundred and eighty degrees.   
     
     
         2 . The exhaust fan of  claim 1 , wherein the central angle is one hundred and eighty degrees. 
     
     
         3 . The exhaust fan of  claim 1 , wherein the motor is oriented coincident with the longitudinal axis. 
     
     
         4 . The exhaust fan of  claim 1 , wherein the first conduit axis and the second conduit axis each extend in a direction parallel to the longitudinal axis. 
     
     
         5 . An exhaust fan comprising:
 a motor,   an impeller rotatably coupled to the motor,   a curb cap configured for interaction with a roof curb, the curb cap including,
 an airflow opening, and 
 a conduit opening, 
   a support pan supporting the motor, and   a conduit extending between the support pan and the conduit opening of the curb cap.   
     
     
         6 . The exhaust fan of  claim 5 , wherein the conduit is constructed of an electrically insulative material. 
     
     
         7 . The exhaust fan of  claim 1 , further comprising a hoodband circumscribing the motor and the impeller, a windband circumscribing the hoodband, the windband being radially spaced from the hoodband, and wherein a first axial end of the conduit is open to the curb cap , and the second axial end is open to an interior volume of the hoodband. 
     
     
         8 . The exhaust fan of  claim 1 , further comprising a connector which couples the conduit to the curb cap. 
     
     
         9 . The exhaust fan of  claim 8 , wherein the connector is press-fit with the conduit. 
     
     
         10 . The exhaust fan of  claim 8 , wherein the connector is press-fit with the conduit opening of the curb cap. 
     
     
         11 . The exhaust fan of  claim 8 , wherein the connector includes a lip larger in size than the conduit opening of the curb cap, the lip having a first side that abuts the curb cap and an opposite second axial side that abuts the conduit. 
     
     
         12 . The exhaust fan of  claim 5 , wherein the conduit is at least partially plastic. 
     
     
         13 . The exhaust fan of  claim 5 , wherein the support pan includes a pan conduit opening through which the conduit extends. 
     
     
         14 . The exhaust fan of  claim 13 , wherein the pan conduit opening is positioned at a periphery of the support pan. 
     
     
         15 . An exhaust fan assembly comprising:
 a motor,   an impeller rotatably coupled to the motor,   a curb cap configured for coupling to a roof curb, the curb cap including,
 an airflow opening, and 
 a conduit opening, 
   a support pan supporting the motor, the support pan including a pan conduit opening,   an electrically insulative conduit extending between the support pan and the conduit opening of the curb cap, and   a wire electrically coupled to the motor, the wire extending through the conduit opening of the curb cap and the pan conduit opening of the support pan, the wire being configured to provide at least one of power current or a control signal to operate the motor.   
     
     
         16 . The exhaust fan of  claim 15 , wherein the wire is a first wire operable at a first voltage and the exhaust fan further comprises a second wire operable at a second voltage different than the first voltage. 
     
     
         17 . The exhaust fan of  claim 15 , further comprising a third wire passing through the first conduit, the first wire and the third wire each operable at the first voltage. 
     
     
         18 . The exhaust fan of  claim 17 , wherein the motor is configured for operation with alternating current power with the first wire and the third wire each providing one phase of alternating current to the motor. 
     
     
         19 . The exhaust fan of  claim 15 , wherein the wire is a first wire of a first group of wires operable at a first voltage and each configured to provide one of a power current or a control signal to the motor. 
     
     
         20 . The exhaust fan of  claim 15 , further comprising a second wire of a second group of wires operable at a second voltage different from the first voltage, the second group of wires configured to provide the other of the power current and control signal to the motor.