General terms and conditions…


MK Sp. z.o.o.

MK is the largest manufacturer of chimney flue and ventilation systems in Poland. Over the past 25 years, the company has expanded its activity across Europe and consolidated its strong position in Germany.

The company offers systems and custom-made solutions for all types of fuel and appliances for residential and commercial buildings. Its expertise also includes systems for power generators, cogeneration units and turbines for the industrial market.

To earn customers’ loyalty and build long-lasting relationships, MK has chosen to focus on what is truly fundamental: attention to market needs and proactivity in terms of security and performance.

The company strives to be always one step ahead of European standards thanks to its R&D team fueled by the Group and its internal innovation center: WeLab®.

MK is a Sphering Group company, a front-line player in flue and air care in Europe with a renowned expertise in design, manufacturing and distribution of innovative high-quality chimney and ventilation systems.

About Sphering Group

Sphering Group shines as a front-line player in flue and air care in Europe with a renowned expertise in design, manufacturing and distribution of innovative high quality chimney and ventilation systems.

The company cares to ensure a healthy, secure and sustainable indoor climate, for residential, commercial and industrial markets.

The Group develops a growing EU footprint with leading brands and solutions portfolio: Apros in Italy, Eurotip in Belgium, Joncoux and Lorflex in France, MK in Germany and Poland and WeLab, its innovation center.

With more than 600 employees, 5 industrial production plants and 22 distribution centers, it has a consolidated turnover of 85 million euros in 2019 and is ready for new acquisitions.

Established in 1919 as Joncoux Group and now celebrating its 100th anniversary, the family owned company is now writing the next page of its market maker history with a new identity as Sphering Group. Faithful to its historical values and attentive to both clients and associates, time has come for even stronger innovation acceleration and attention to service and advanced quality.

Yes we care

Our core values

In 100 years, everything has changed except our values

Reliable partner


We are responsible and have loyal relationship with our employees, customers and suppliers.

Leading edge

Our quality standards are more demanding than industry standards. We create innovation that matter with robust product launches.

We are sure of the quality, safety, durability and performance of the new products. We stand for real benefits. Ahead of the game.

Long-term family horizon


We stand for a new century of innovative adaptation and demanding excellence for the future generations.

Constant adaptability to market changes – 100 years of Darwinism. Long-term means no mediocrity or laziness. Profit is reinvested and is the fuel that keeps the company alive.

No shortcut

Innovation, safety performance and quality: we make no compromise on the standards to match.

No shortcut on quality process. No shortcut in problem solving. No shortcut in innovation. No shortcut on safety & environment in our plants.

Local approach


Decisions, design and production are made at local level for the best adaptability and availability of products and services.

Local decision-making. High quality of service. Production locally to meet local standards. Pride of local manufacturing & employment

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