Outer skin is made from 304 grade stainless steel and is 0.4mm thick. Inner skin is made from 316 grade stainless steel and is 0.4mm thick.
Insulation is compressed rockwool giving a density of 200kg/m3 TWPro / 128Kg/m3.
All parts are fully welded.
Distance to combustibles is 50mm
TWPro is HETAS Approved and is UKCA marked.
TWPro EN1856-1 T600 N1 W V2 L50040 G50.
TWPro EN1856-1 T200 W V2 L50040 O20.
25 Year Conditional Warranty on product
2 years on paint finish
TWPro Twin Wall Insulated Chimney parts are secured together by using a Locking Band.
Make sure that you keep the required distance from the outside of the flue to any combustible material (wood, plaster board).