Removing burnt bricks Black carbon is a major problem Poor working conditions Working conditions


HZZK Differences

What differentiates Habla Zig-Zag Kilns from other technologies?

  • A completely consistent kiln in design and operation.
  • Efficient use of fuel reduces energy consumption.
  • Efficient firing process.
  • Offers almost complete combustion.
  • Efficient use of generated heat, it is recycled in a continuous process.
  • Design features: Long fire zone, roof, arch-less design, no tall chimney, scalable operating mode, power source flexibility, small construction footprint, easily mechanized.


  • Significantly reduces CO2 and Black Carbon (soot).
  • Improves health outcomes, working and living conditions of workers.
  • Uses existing workforce.


  • Significant fuel savings, increases profit.
  • Lower construction costs.
  • Low maintenance costs.
  • Short payback period.
  • Produces consistent, quality, saleable bricks increasing profits.
  • Carbon credit generation.
  • Significant foreign exchange savings as less imported coal is required i.e. Nepal and Bangladesh.


Compared to

Clamp Kiln: An ancient primitive technology. This kiln is highly polluting, inefficient fuel use and labour intensive. Wide spread use in India and Africa. Operated only in intermittent mode.

Hoffman Kiln: Invented in Germany 1858. Designed with large, permanent masonry arches and expensive tall chimney approx. 30 metres tall. Kiln must operate in continuous mode.

Bull’s Trench Kiln-Movable Metal Chimney: Generally banned, still existent in places. Workers together move metal chimneys as the fire moves through the kiln. High emissions and hazardous working conditions.

Fixed Chimney Bulls Trench Kiln (FCBTK): Prevalent in South Asia (India, Bangladesh and Nepal) where pressure for low emission technology is mounting, due to highly polluted air and related health concerns. Has a tall expensive 30 metre chimney, highly polluting. Seasonal use only i.e. cannot be used during the monsoon. Operates only in continuous mode.

Tunnel Kiln: Has minimal emissions, mechanized/highly automated processes, expensive to construct, requires reliable power/electricity supply

Vertical Shaft Brick Kiln (VSBK):  Reasonably fuel efficient, limited by a low throughput. Highly clay specific. Bricks carried via a ramp or steps to the top of firing shaft.

Cutting CO2 emissions in brick-making

The successful conclusion of the in-depth research study is a significant achievement for the Energy Efficient Clay Brick (EECB) Project, a CBA initiative funded by the Swiss Agency for Development and Cooperation (SDC) and implemented in South Africa by Swisscontact.

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