Until now I used a normal air conditioning cap, but I did not know whether to install the air conditioner this time, so I chose this product which also served as a ventilation opening anyway. On the outside set up a general lily. I think that the inside protrudes, but I think it is good.
It is very convenient to use the hole for piping of unused air conditioner easily as outside air inlet. Design and color tone are good, and it harmonizes with the room. It is also good to be able to adjust the inhalation volume. There may be a set with a mechula cap.