Technical Characteristics

Optimal round section - MD Plus has been designed to meet different installation requirements, in order to minimise charge losses and facilitate the correct draft of the system, even at the most adverse working conditions.

Low internal rugosity - The MD Plus contributes with a minimum friction coefficient to an optimal working of the chimney, avoiding unnecessary flue gas resistance to the movement.

Resistance to corrosion - The MD Plus outer is manufactured in AISI 304 stainless steel whilst the inner is manufactured in AISI 316 stainless steel. These materials provide both resistance to corrosion and the most effective evacuation of combustion products.

Low thermal inertia - Stainless steel is the best material available for the manufacture of prefabricated chimney systems. The small total mass, combined with the facility for heat absorption, allow stainless steel to quickly reach the high conduction temperatures required for efficient evacuation of combustion gasses.

Water tightness - MD Plus components are completely water tight against steam diffusion. This avoids insulation moisture problems between the inner and the outer wall. Note:- This is not the case with open ended systems or systems where the inner is not fully welded.

Thermal insulation - Insulation reduces the cooling of combustion products, keeping the optimal temperature and achieving the correct performance of the appliance. The insulation between the outer and inner walls ensures a strong draft at the start of firing to minimise condensation, as well as to facilitate a lower external surface temperature of the product.

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Negarra have a production capacity of 2800 metres a day for twin wall flue, and 4200 metres/day of single wall flue. That's some production ! They also have over €2 million of finished stock contained in a fully robotic warehouse. Find out more ...