Here are some answers to your concerns:
Q: What size of hole needs to be cut?
A: You'll need to cut a 28.5'' x 28.5'' 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.
|Air Volume||3320 CFM|
|Material||Aluminum Alloy, Galvanized Steel|
|Voltage||AC 120 V / 60 Hz|
|Rotating Speed||1300 RPM|
|Weight||27.9 lbs / 12.65 kg|