Product review (4 stars): This product was crimped at the round end
I wish I was told that the round end was crimped. As it were, I tried to connect it to the top of a hood exhaust that had a damper inside. Placing the round part INTO the top hood opening clearly interferes with the opening of the damper. The round part should have been uncrimped. (I do not have enough room to install another transition piece). Otherwise, the duct transition is fine.