About this door bottom seals & brush strips
Stormguard 914mm White Bottom-of-Door Brush Strip
This is the no-frills version of a Stormguard door brush: a slim white carrier strip with a row of bristles on one edge. It is 914mm long, matches the width of most UK doors, and comes with fixings, so there is no trip to the hardware shop to find the right screws.
The bristles do the work. They flex against the floor, close the gap under the door and let the door swing without dragging on a carpet, which is where stiffer rubber seals struggle. A maximum gap of 25mm makes it comfortable on doors that have dropped slightly or sit over a thick threshold mat.
Cut it to width, hold it against the door, mark the slots and screw it on. If you are fitting it to an external door, choose the brush height carefully so it clears any threshold and still brushes the floor. If you want a cover over the screws, the clip-cover version in this range is the neater choice.