Vent Systems 1.5" Inch Door Air Register - Two Sided Door Louvers - Mini Circle - Ventilation Grille - Indoor Vent Grates - Bathroom, Cabinet, Garage Through The Door Vent Cover - Pack of (4)

Product came on time. Seemed larger in pic. Does keep door from slamming.

I put these in the top of my doors in the house for a better all around circulation seems to be working well

Overall good product and would do what is says on the tin. However pictures in the listing are a little bit out of scale, which makes vents look bigger then they actually are.

Had to sand down the length of the tube in order to get a snug fit on a 1.5 inch thick door. Two of these on a bedroom door does not permit enough air flow to prevent the door from being pushed shut when the AC turns on.

They were easy to install. Smaller than expected so either need more or larger vents to solve your issue.