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Reducers

Photo of product family: Reducers

Reducers are produced in diameters range 80 to 1600 mm of galvanized, aluminium and acid-resistant steel. They are used to ventilation systems.

They are recommended in the version with EPDM seals to ensure achieving "D" class leaktightness according to Eurovent (SITAC certificate). In both versions there are several types of reducers:

  • Short symmetric reducers which are mainly offered as pressed elements. Depending on a method of connection they are available as RPC and RPCL with nipples at both ends or as RPCF and RPCFL with a muff on a bigger diameter .
  • Long segmented reducers, symmetric and asymmetric, are available with or without seals as well as with use of muff and nipple connections.

Optionally segmented reducers can be produced with various untypical diameters and thickness of sheet.

Reducers - Products range
Miniature picture Product code Name of product Files to download
Photo of product Short, concentric reducer with seals RPCL

Short, concentric reducer with seals


The RPCL reducers have male ends which slip into spiral ducts or plain ducts.
The ends feature double EPDM gaskets to ensure the highest class of air tightness.

This reducer helps to save installation space, but it increases the flow resistance
compared to RSCLL long reducers. Standard nominal diameters up to DN 315 mm are
available for pressed pieces at a lower price and with an improved finish.

Short, concentric reducer with seals
Photo of product Short, concentric ventilation reducer RPC

Short, concentric ventilation reducer


The RPC reducers have male ends which slip into spiral ducts or plain ducts.
The safe-edge ends have hemmed rims. This reducer helps to save installation
space, but it increases the flow resistance compared to RSCL long reducers.

Standard nominal diameters up to DN 315 mm are available for pressed pieces
at a lower price and with an improved finish. The air tightness can be increased
to class B by wrapping the joints with the TAL, MET or DUCT sealing tape.

Short, concentric ventilation reducer
Photo of product Short ventilation reducer with female end and rubber seal RPCFL

Short ventilation reducer with female end and rubber seal

The larger end is female without a gasket to fit over T-pieces and bends.
The small end is male with a double EPDM gasket to slip into spiral ducts.

This reducer helps to save installation space, but it increases the flow
resistance compared to RSCLFL long reducers. Standard nominal diameters
up to DN 315 mm are available for pressed pieces at a lower price and
with an improved finish.

Short ventilation reducer with female end and rubber seal
Photo of product Short ventilation reducer with female connection RPCF

Short ventilation reducer with female connection

Neither end is provided with a gasket. The larger end is female sized to
fit over other male fittings. The small end has a safe edge as a result
of the hemmed rim.

This piece is perfect for heat recovery systems and mechanical ventilation systems.
Standard nominal diameters up to DN 315 mm are available for pressed pieces at
a lower price and with an improved finish.

Short ventilation reducer with female connection
Photo of product Long reducers RSCLL/RSLL/RSCLFL/RSLFL

Long reducers


Long reducers are used in ventilation systems in industrial, office and housing buildings.
They are installed in systems made of spiral ducts, bends and other fittings. The reduced
diameter acts as a confusor to increase the air flow rate.

When installed with the large diameter towards the incoming air flow, the piece works like
a diffuser. All reducers are available in galvanized steel sheet, stainless steel sheet or
aluminium sheet. Eccentric reducers are known as a reducers with one flat side, therefore
they are used when the ductwork is supposed to be installed tight to the ceiling slab or onto the wall.

Long reducers
Photo of product Segment flat reductions RSFC/ RSFCF/ RSFCL/ RSFCFL/ RSF/ RSFF/ RSFL/ RSFF

Segment flat reductions


Flat segmented reducers have end caps with a port of a smaller
diameter than the flat body diameter. They are most often used for
building ventilation duct penetrations in floor partitions.

Concentric reducers can be installed as silencer dips or used for
capping SPRPI ducts to build duct silencers as much as 3 metre long.

Segment flat reductions
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