Including Programmable Controller
14 inch
Here are some answers to your concerns:
Q: What size of hole needs to be cut?
A: You will need to cut a 17.1'' x 17.1'' hole to place the fan before installation. Fans can be installed both inside and outside the walls.
Q: How to connect these wires inside the fan?
A: No assembly required. Complete kit includes the fan unit, the controller, corded sensor probe, and power it through an outlet.