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CLV-systems

For more than 20 years, Breman Ijsselmuiden has supplied modern, Gastec QA approved, CLV systems for the discharge of combustion gases, under the brand name “Lucht Rookgas Concentrisch” (LRC = Air, Combustion gas, Concentric). A future-oriented product in which the use of modern machines and the specialised knowledge of experienced craftsmen are combined effectively. Future-oriented, because the CLV system, with its reduced diameters, connects seamlessly with the latest generation of central heating boilers.
Smaller diameter = more space
Smaller diameter means smaller shafts, an approach that results in more living and storage space. The broad application of the CLV system is demonstrated first of all through its ability to connect different sorts of central heating boilers to one system. In addition, the CLV system can be installed in a variety of different places, for example, in a service shaft, in 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 CLV:

  • Connection capabilities for all C4-types of fan controlled central heating boilers.
  • Connection of C4-type central heating boilers of different manufacturers to one system.
  • Connection of C4-type central heating boilers of different ratings to one system.
  • A gastight system with 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 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 roof cap of the CLV system into a combination roof cap. In this extended form, we also 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 colour.

Dimensions of the CLV system 30 kW table according to Gastec QA norm

Appliances Diameter of air intake Diameter of outlet for combustion gases
2 281 151
3 312 168
4 332 178
5 351 188
6 369 198
7 388 208
8 407 218
9 427 228
10 446 238
11 465 249
12 484 259
13 503 269
14 522 279
15 541 289
16 560 299
17 579 309
18 598 319
19 616 330
20 635 340
(sizes in mm)

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


CLV + ventilation ducts in building under construction


Implementation on outside wall


Flat-roof chimney with collective multiple exhaust


Flat-roof chimney with collective multiple exhaust