Build your own airtightness in-window fan: Supercharge your retrofit!

Join this practical workshop to make your own airtightness in-window fan which does the basic job of a Blower Door test at a fraction of the cost. You will leave with your own measurement tool and the skills and confidence to use it to find the hidden leaks in your property and make your home more airtight.

We supply all the PAT tested, CE rated components and tools plus the training support to help you make and use your own airtightness measurement tool.

Cost to attendee: £200

Great for the DIYer or teaching your builder to build airtight on the job. Commercial in-window airtightness fans are available to buy, for around £1400. Why not build your own and learn how to use it in our workshop for £200.

2 minute video : what is CRH's airtightness fan, why is it useful? https://www.youtube.com/watch?v=iIM7KVAIAM8