MP single wall flues for negative pressure fumes from solid, liquid or gas fuelled appliances are easy to install, lightweight, and strong. They are ideal for indoor installations, ventilation shafts, and for the refurbishment of existing flues. - The use of AISI 316L stainless steel (DIN 1.4404) in various thicknesses (5-6-8/10 mm) ensures reliability and air tightness. Welds are all laser or TIG welds. - A bell joint assembly system, with optional outer joint clamps, ensures that MP flues are functional and safe even when used with positive pressure gases. - MP flues can be used in conjunction with DP flues, since they are suitable for connection to boilers as fume exhausts.