What does the rough opening need to be for SKU AX36-7 ? We need to know asap.

The rough opening for the Canarm AX36-7 exhaust fan should be ½ inch larger than the shutter box size. That means the opening should be 39.5" x 39.5" to allow for a proper fit around the 39" shutter frame. If you have any further questions, please feel free to give us a call! Thanks.