I'm interested in installing a bath fan and am currently planning ou the project.
The fan specs (https://www.homedepot.com/p/Delta-Breez-GreenBuilder-Series-100-CFM-Wall-or-Ceiling-Bathroom-Exhaust-Fan-ENERGY-STAR-GBR100/204347760) say that the port should be 4".
This leads me to believe that the tube entrance should be larger than 4", but I'm not entirely certain. I was thinking of insulated ducting similar to (https://www.homedepot.com/p/Master-Flow-4-in-x-12-ft-Insulated-Flexible-Duct-R6-Silver-Jacket-F6IFD4X144/203420974) for the attic.
Does 4" ducting connect to the 4" fan or does the ducting need to be larger (Such as 6" ducting)?