Tecnovis

Tecnovis is the name in this catalog that answers the question every flue shelf raises and almost nobody addresses: what does this fit?

Its twin-wall length names two specific chimney systems and the insulation thickness they use, supplies the clamping band that actually holds two elements together, and carries a twenty-five year manufacturer warranty on a structural part. That is three statements more than the shelf average.

It is not uniformly strong. The same listing gives V4A and then 1.4301 for the inner tube, which are different grades, and publishes no wall thickness where six rivals do. The product page reports the contradiction rather than choosing the flattering half.

What the one product here publishes

The twin-wall length is 500 mm (19.7 in) long, 150 mm inside and 200 mm outside, with 25 mm (0.98 in) of mineral insulation. The listing names the two chimney systems it fits, includes the clamping band, states TÜV certification and approval to 600 °C (1112 °F), and gives a 25-year manufacturer warranty. It also calls the inner tube V4A and then 1.4301, which are two different stainless grades, and publishes no wall thickness.