Maurice Franklin 4" Round Plastic Vent - Black - Package of 4

These worked perfectly for what we needed. Had to drill a round 4" hole in a door to allow airflow to central air return. Carefully drilled the 4" hole through the top center of the door, and then inserted these. Snug fit, exactly as I had hoped for. Spray painted them white. Worked great, barely noticeable. Little sound passes through them. So all good.

Quality, sturdy plastic... Absolutely NOT flimsy junk

Added these vents to plywood to vent air for refrigerator in a van build to help circulate the air

I installed these vents into a cabinet where I wanted a light convection to help my cable modem and a small UPS stay cool while out of sight. The vents are working great and it never gets hot in the cabinet. I drilled a 4" hole and these fit perfectly and snugly. Once you get them pushed in they won't pop back out unless you go to the underside and give them a push.The black plastic mostly disappear into my room. I never even notice them.

These vents offer a nice sleek appearance to our freshly painted eaves. They are a considerable upgrade to the 1970’s larger, rectangular metal vents that once occupied our eaves. They are easy to install and pop out for adjustments. However because they are small we will be installing more throughout the eaves.

Used for reptile cages. Installed with silicone

I had to drill 3" holes for foundation ventilation. House is brick. These fit right in the holes and are working out very well. I would recommend.

The product did what it was advertised to do which is nice.