Concentric flue cascade C93X for condensing boilers: the collectors, boiler adapters, elbows and end pieces in PP/stainless white, from Ø60/100 to Ø200/300 mm. Inside, a PPH pipe carries the flue gas; the outer pipe in white powder-coated stainless steel supplies the combustion air: air and flue gas in one line. For gas or oil condensing boilers, flue gas up to 120 °C, negative and positive pressure. Designation EN 14471: T120 H1/P1 W2 O00 LI E U0.
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What is a C93X cascade? Several condensing boilers discharge into one common concentric line: flue gas inside, combustion air outside. From the shaft, the flue gas rises through a single-wall pipe and the air comes down the shaft around that pipe. One penetration for a whole bank of boilers.
How to build the cascade? From the last boiler to the shaft:
| Part | Codes | Where |
|---|---|---|
| Cascade end piece | CONCASEK / CONCASES | start of the line: with connection for the last boiler or with drain |
| Boiler adapter or adapter tee | CONCASKA / CONCASKAM | on every boiler, from the outlet to the system diameter |
| Cascade collector 1 m | CONCASTV60 / TV80 / TVK80 | one per boiler, without or with non-return valve |
| Pipes, adjustable pipe, elbows | CONCAS25/50/100, PP32/PP50, B15-B87 | connection to the shaft or the wall |
| Drain and inspection | CONCASCAH / CAV / IB87 | at the low point and at the foot of the vertical flue |
| Support elbow to the shaft | CONCASSB87 | transition to the vertical flue |
| In the shaft (C93X) | CONCASSBV / EB / AH | single-wall black PP: support elbow with rail, end pipe, spacers |
| Outlet | CONCASMT / CONCASDD | horizontal through the wall or vertical through the roof |
Which diameter? The collector must carry the flue gas of all boilers together: the diameter follows from the total output, the number of boilers, the length and the elbows (EN 13384). Send us the boilers and the layout: we calculate and draw up the parts list.
With or without non-return valve? Under positive pressure, flue gas must not enter through an idle boiler: choose the collector with valve (TVK80), unless the boilers have their own valve. Only use a valve if the boiler manufacturer allows it.
Where does the condensate go? All horizontal lines have a fall of at least 3°; the condensate is collected in the cascade end piece or drain tee and discharged through a siphon, for large outputs via a neutralisation box.
Ventichim supplies the complete concentric cascade C93X, from boiler connection to terminal, to installers throughout Belgium. Unsure about the diameter or the layout? Send us your setup: we check the cascade according to EN 13384.
