I'm installing an exhaust fan and using rigid 4" ducting. The ducting has a tapered end, which I assumed goes into the ducting attached to the outside vent, but I don't know how to secure the non-tapered end to the fan itself, as both the ducting and the connection on the fan are 4" exactly, I can't fit one inside the other. How is this supposed to be done, is there a coupler of some kind that I need?
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