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CRA-systems

Breman IJsselmuiden has developed the Collectief Rookgas Afvoerkanaal (CRA Ð Collective Combustion gas Discharge duct) specially for locations where the CLV system cannot be used because of space restrictions. CRA is a sophisticated product in which the use of modern machines and the specialised knowledge of experienced craftsmen are combined effectively. The CRA system makes use of ducts of reduced diameters, and is therefore very suitable for use in renovation work in multi-storey housing. In this case, the air supply for the central heating boilers is taken through the outside wall of each housing unit.
Smaller diameter = more space
Smaller diameter means smaller shafts, and thus less waste of living and storage space. The broad application of the CRA system is demonstrated by the way in which the system can be installed in various locations, for example, in a service shaft, a balcony cupboard, or on the outside wall. We can supply systems in either aluminium or stainless steel. A version can also be supplied in a RAL colour.

Summary of the advantages of the CRA system:

  • Can be connected to any kind of C4-type fan controlled boiler.
  • A gastight system with only a limited number of connections per floor.
  • Simple and fast installation.

Consultation with client
The supply and installation of the system is preceded by a comprehensive and thorough consultation with the client in which we can draw upon 20 years of specialist experience. In this discussion, the client, in close consultation with Breman IJsselmuiden, determines the arrangement of the service shaft, the design of the chimneys, and the colour of the roof cap. All aspects that affect the other disciplines involved in this work are also taken into account.

Roof caps for every desired situation
We can extend the through-roof cap of the CRA system into a combined prefabricated chimney. In this extended form, we incorporate the outlets for ventilation ducts and the sewer vent. It is also possible to provide fittings for a roof ventilator or transit possibilities for other types of pipes and cables in the roof caps. The roof caps can be supplied in any RAL colour.

Dimensions of the CRA system 30kW

Appliances - Diameter of outlet for combustion gas
2 140
3 160
4 180
5 200
6 220
7 240
8 260
9 270
10 290
(sizes in mm)

In consultation with the boiler supplier, it may be possible to customice from the quoted sizes. Tables are also available for 20 kW, 25 kW and 35 kW.


Components of our aluminium CRA system