What size infeed louvers do I need to match with

For the Canarm AX30‑2, you’ll want to match the infeed louvers to its framing dimensions of 33″ × 33″. The fan's own flange measures 35¼″ × 35¼″, but the rough opening or louver size you need is 33″ × 33″. If you have any further questions, please feel free to give us a call. Thank you!