Concentric air/flue system CLV

Concentric air/flue system is designed to convey combustion air from the outside of a building and supply it through chimney ducts. System can be installed internally or externally.


Gas or oil

Working temperature

≤ 200° C


Inner pipe: stainless steel EN 1.4404
Outer pipe: stainless steel EN 1.4301 or painted steel

Wall thickness

when dnfrom 80 to 200 mm – 0.5, 0.6, 0.8, 1.0 mm;
when dn from 210 to 400 mm – 0.6, 0.8, 1.0 mm;

Pressure class

P1 – positive pressure

Sootfire resistance

O – not resistant

Distance to combustible materials

01 mm

Condensate resistance

W – designed for wet operating conditions



System marking

EN 14989-2 T200-P1-W-Vm-L50050-O00
EN 14989-2 T200-P1-W-Vm-L50060-O00
EN 14989-2 T200-P1-W-Vm-L50080-O00
EN 14989-2 T200-P1-W-Vm-L50100-O00





1 The actual minimum distance to combustible material from the outer surface of a chimney must be defined according to the designation of the chimney, as described in their marking, and national legal acts. If the legal acts and chimney designation indicate different admissible distances to the combustible materials, it is necessary to follow a bigger distance. Jei teisės aktuose ir koncentrinio dūmtraukio/ortakio žymėjime minėti atstumai skiriasi, tada reikia vadovautis didesniu leistinu atstumu iki degių medžiagų.

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