Chimney Balloon 9 x 9 inch Mouth Inflation Tube-Save Money and Waste, Small

Has done the job required, had to measure to make sure I got the right size before ordering. It does not come with a pump, you need to blow it up with your mouth or use a hand / foot pump. Cost is acceptable for what it is.

Unfortunately, i brought the wrong size so wasnt able to use it.

Installed this into the chimney mouth of my lounge fireplace at the start of the winter. It's basically cut dead the down flow of cold air into the room and made the whole room feel so much cosier. The balloon is simple to inflate and several months on since installation I've not had to top it up once. You will need to get on your hands and knees to install it into your chimney, and this will probably require you to adjust the amount of air in the balloon a few times to get a perfect fit, but once done, it does exactly what it says on the tin.

Poor. It went down within a week. Use loft insulation instead

As per the headline - the larger version was then bought & fitted