Flawless, it works seamlessly for years and comfortably covers the entire space underneath.
Very good purchase!

I am not satisfied with this specific air curtain, I have had it for only a year and it only worked for the summer season, 5 months in total. Firstly, it makes a lot of noise and there is a gap in the middle where flies can easily pass through. Sometimes it doesn't start up and you have to turn off the safety switch for a while and then it starts working again. I read about this issue in another comment, luckily I thought it was burnt out and that's how I fixed it and it started working again.

Big potato doesn't work properly, it has a gap between the blinds and it also makes a lot of noise, and after 1 year the remote control stopped working.

The gap in between leaves the space exposed, resulting in the air curtain being useless.
I bought the air curtain to prevent insects from entering the store, but I made a hole in the water with this specific one, as I can clearly see flies finding margin and passing through the gap.
It also makes a lot of noise when it is at the medium levels needed for the air to reach down to 3 meters.
Bad purchase.

Stay away from this type of air curtains that have the air ducts separated in two. The construction design is unacceptable. It has a gap in the middle, making it useless because this gap is enough to have heat/cooling losses from the room, as well as enough for smoke to enter if people smoke outside. Additionally, after about 2 years, the frame broke in the middle. Very poor quality materials.

I have installed it at a height of 3 meters in a professional space and yet it produces strong air and I can lower the speed. It is a powerful air curtain. The only negatives I noticed are 1) noise on the high setting, it decreases significantly if you lower the speed a bit (I have music playing so it doesn't bother me) and 2) it doesn't have an indication on the unit of which speed it is on, but I give it a 5 because it has a strong air flow. I don't think there is another one with an air flow of 2435/970m3/h at this price.

After less than 1 year of operation, sometimes it doesn't start with the remote control or by pressing the switch and it requires a 5-second power down and then it works normally again