Many airtight installers do not have a solution, how to get a twin-wall chimney flue sealed air-tight.
The direct application to the flue is not recommended, because most of the membranes and tapes have a maximum temperature resistance of +80°C. Unfortunately the temperatures of the flue could reach higher temperatures easily.
Our heat-resistant grommet is made for temperatures up to +250°Celsius. The self-adhesive collar sticks easily to all kind of airtight & vapour control membranes. For applications to blockwork we highly recommend the use of our butyl version.
This heat-resistant airtight grommet, which is designed and manufactured in Germany, is approved by independet German testing agencies GTÜ and TÜV.
Available in various widths for all types of twin-wall chimney flues.
Please expect a delivery time of roughly 7-10 working days.