Steinberg14 Oak Door Vents for Interior Doors 450x92mm / 17.7x3.6 inch Two Sided Ventilation Grille - Beige Plastic Cover - Door Air Vent with Screws

Very easy to cut and fit, had to adjust a few times to get it just as I wanted to block the draft, yet not rub too much on the carpet. Despite removing and repositioning the level of adhesion is good. Material feels good quality and hard wearing.

Easy to fit Strong enough Looks good on the door Happy to recommend

Good product, bought for bathroom doors to allow air flow when fan is running. Now steam is removed quickly. Just be careful to pick the correct screw length as they can protrude through the face.

Fitted low in the door to get good airflow in the room. Perfect for me, but you may have problem with a thicker door, will need longer screws

Worked well for ventilation in our porch. No more wet walls

Value for money, quality product.

Underlining what others have said, the supplied screws are too short for a standard 35mm door, 35mm electrical screws do seem to fit the bill, but it's VERY fiddly (larger/wider screws don't work as they would protrude out of the countersunk holes). I bought two of these, and found that the female screw holes on both of them are solid (i.e. filled with excess plastic) and need to be drilled out to exactly the right size before they can be used. I ruined one and had to reorder another because the holes stripped. Overall a very poor product.

My door is 36mm..........and the screws are too short....seen this problem in other reviews.