You should be careful when choosing draught exclusion in kitchens and bathrooms. You need to make sure you ventilate these rooms well to avoid moisture build up that can result in damp. So if you have draught exclusion in these rooms, make sure the insulation is counteracted with good ventilation.
Make sure you don't block any deliberately placed ventilation points – such as extractor fans, grilles or wall vents.
The same goes for any room with a fireplace. Any rooms that have a fire need to well ventilated to avoid fumes from the fire becoming dangerous in your home. A good idea is that when the fire isn't in use, think of temporary draught excluders like chimney balloons.
You can do DIY draught-proofing for small jobs, but consider hiring a professional if you're not sure or it's a bigger job. They'll know the right areas to block and have the right materials.