STI Spiral cap chimney stack

Stainless steel twin-wall chimney stacks ‘STI’
Designed for new build and renovated houses, ‘STI’ is an innovative evolution of the standard Therminox chimney termination, providing a welded storm collar and chimney supporting flashing for perfect weather tightness and up to 3m free-standing chimney above the roof flashing.
The ‘STI’ chimney stack can be installed on any roofing material and pitch. Its aesthetic finish is suitable for use on traditional or contemporary house architecture, it is supplied with a body finish choice in stainless steel or RAL colours to match the theme of the house or roof and it ensures a perfect safe evacuation of smoke.

The new Galactic, Vénitien and Spiral rain caps provide a designed range of terminal that provides a unique choice and personalisation in the aesthetic of the chimney.