Chimney double-wall connector union piece (double-wall muff) +/- is designed for connecting a pipe to a brick chimney. It protects the chimney from stresses and expansions caused by the thermal work of black pipes.
Single-wall systems made of 2 mm thick steel sheets are used to remove smoke from fireplaces and solid fuel heaters (operating without condensation), where flue gas temperatures can reach up to 1000 °C.
Black pipes and fittings are characterised by very fast assembly and high strength. They are rolled on special factory equipment - on one side the landing place is smaller in size, on the other side is larger, which allows assembling the chimney using the ‘one-in-one’ method. The seam is welded by laser welding, which ensures reliability, beautiful aesthetic appearance and convenience in further maintenance. The inner surface is smooth, which does not allow a large amount of soot to accumulate on the walls of the chimney.
After finishing, black heat-resistant paint ‘Senotherm’ is applied to the products. This paint does not smoke when first burning, does not emit an unpleasant odour and due to these properties is used by most fireplace manufacturers.
Black pipes and fittings are installed indoors before entering the flue duct or chimney shaft. When installed outdoors, the chimney should be thermally insulated.
The products shown in the photos may differ slightly from those offered for sale (photos are for example only). 

Manufacturer: PRODMAX

Material: 2 mm thick steel sheet, painted with heat-resistant paint

Diameter range: 120-250 мм

Certificate: All products are certified and comply with European standards, have CE certificate in accordance with EN-1856-2.