Keep things ventilated
Don’t be tempted to overdo the draught proofing, though. You want to cut out unwanted draughts but still let your home breathe. That means there are some things you should never block up: extractor fans, underfloor grilles and air bricks, wall vents and trickle vents.
These features all do an important job in your home – they get rid of damp air and let in small amounts of fresh air. If you block them up, you run the risk of damp and mold. You’ll also find vents installed near some gas appliances. These are essential safety vents and you should always leave them uncovered.