Chimney Balloon Medium review

Name: Chimney Balloon® draught excluder – Medium, 24" x 14" (61cm x 36cm)
Brand: Chimney Balloon

Chimney Balloon® draught excluder – Medium, 24" x 14" (61cm x 36cm)

By Tom Calder

Photo: Amazon

Our verdict · Researched

3.8 / 5

It does the job of sealing a redundant flue and is sized for a common range of UK flue dimensions, but unlike the Stormguard equivalent on this page, its own product page carries no explicit on-pack warning against use in a flue still in service — so the safety check is entirely down to you to remember, every time.

Best for: Blocking draughts from a genuinely unused, capped, or professionally confirmed-redundant chimney flue.
Skip it if: There's any doubt the flue is still connected to a working fire, boiler or stove

Amazon.co.uk price

£19.00

as of 5 Nov 2026, 22:07 GMT · Details

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.

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Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.

What we like

Sized for a specific, common UK flue range (9–14in deep, 16–24in wide)
PVC-free inflatable construction
Simple mouth-inflation fitting, no tools or fixings needed

Worth knowing

No on-pack warning against use in a working flue — you must apply the 'unused flues only' rule yourself, unlike the Stormguard version below
A foot or hand pump is recommended for inflation but sold separately, adding to the real cost
Even in an unused flue, gov guidance says to keep a small vent open elsewhere in it to prevent damp and condensation build-up, which this product alone doesn't address

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Who shouldn't buy this

Skip this if there's any doubt the flue is still connected to a working fire, boiler or stove — get it swept and confirmed redundant first, or choose the Stormguard chimney excluder instead, which states its safety warning on the packaging.

Key specs

Type	Inflatable chimney draught excluder (chimney balloon)
Coverage	61cm x 36cm; suitable for flues roughly 9–14in deep and 16–24in wide
Material	PVC-free inflatable construction
Fitting	Inflated via supplied tube; pump recommended, sold separately

How this review works

This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.

How we review →Full methodology →