Product review (1 stars): Very tight 4" duct!
I agree with the other 2 bad reviews. While attempting to install, it kept separating at the seams. Very cheaply made. Had to go to local hardware store and buy a properly constructed semi-rigid duct that slips over connector. Duct seems like a very tight 4". Ended up throwing it away and bought a better one at the local hardware store. Would not recommend, waste of money.