Brochure
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Z-DENS CONCENTRIC is precisely designed 
for use with condensing gas and oil heating 
appliances. 
Certified to ULC S636 and CE Marked to European 
standards EN 1856-1 and EN 14471. 
Z-DENS CONCENTRIC, through continuous 
improvement, is engineered for optimum performance.
The outer pipe is aluminum and the inner flue pipe is manufactured 
with fire retardant polypropylene. 
(Please Note: Z-DENS CONCENTRIC can only be selected for use 
with high efficiency/condensing appliances.)
The inner pipe is centred in the outer pipe by the patented 
connection (Patent number: NL C 1022411). This system is 
available in concentric diameter sizes 2”/4” (60/100 mm), 3”/5” 
(80/125 mm) and 4”/6” (110/160 mm). Colour of outer pipe is 
white (RAL9016).
Significant Advantages 
• The system is easy to assemble
• The system is particularly rigid
• It is modern in appearance
• The same system can be used indoors as well as outdoors
• Patent number: NL C 1022411
• Certified to ULC S636 Gas Vent-BH Class II C - 110°C/ 230°F
• CE Marked according the European standards EN 1856-1 and 
EN 14471
Z-DENS Concentric
Z-DENS CONCENTRIC The Next Generation in Flue Systems
2”/4” | 3”/5” | 4”/6” (60/100 | 80/125 | 110/160 mm)
Z-DENS CONCENTRIC designed for use with condensing heating appliances. The system has an inner 
polypropylene flue outlet pipe which is centered in the outer aluminum air intake pipe by the patented 
CONNEX
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-connection. The system is available in the nominal concentric measurements 2”/4”, 3”/5” and 
4”/6” (60/100, 80/125 and 110/160 mm), in the colour white (RAL 9016).










