GB DIY Store 5 x uPVC Window Trickle Slot Vent White 400mm White - Reduces Condensation, Damp & Steam (5 Pack)

Cleared my window condensation and seems to have lowered overall humidity, slight draft if wind blowing in the right direction but that means it's working

If wind in a certain direction they whistle,

Works like a charm, value for money and looks ok. Shame it doesn’t have a grill on the inside too to hide the holes you made. Fits well and once installed seems strong.

I bought these to replace the inner vents that had all been broken due to poor design. These replacements are great for the price and were easy to install. These replacements vents are much stronger than the existing ones. The open and closing mechanism is much easier to operate.

Great product, easy to fit

These were purchased to install in my daughters flat. Worked a treat. She says he draughts issue is no longer there. I only needed to use the internal ones as the outside ones were hard to remove so I left them.

Fitted well, Good quality, Good value

Very easy to install, as just two screws and drilling some air holes. However, it really needs some sort of central fixing or support as it’s very bendy in the middle. Secondly there is no screening on the inside vent. So once the flap is open, you see all of the holes you’ve drilled. Where as there is screening on the outside, which’s masks them a bit better. I don’t know if I would buy these again based on the above as I’m now on the hunt for small Mesh to hide the holes when open. If this doesn’t bother you, then these are ok vents and fairly cheap.