Choosing the right model

CAV Box control (Fixed Volume set point)
The controller operates to a fixed volume set point to give Constant Volume operation.
Circular Attenuator type PZC – with POD
For sound attenuation in ventilated ducts and ventilated areas.
Sizes:
- A full range of sizes from 355 up to 1000mm D
Materials:
- Galvanised Steel
Ordering options:

Circular Attenuator type PZM
For sound attenuation in ventilated ducts and ventilated areas.
Sizes:
- A full range of sizes from 100 up to 315mm D
Materials:
- Galvanised Steel
Ordering options:

Circular VAV Terminal Units
The Variable Volume Circular type RVP-C provides volume flow control of extract and supply air systems across a wide range of sizes and volumes to suit any application. Ideally suited for use with the TEL AFA5000 Room Space Controller.
Fitted from 1 x duct diameter from a bend.
Key Features:-
- Factory Parameterisation to client requirements
- Maintenance free
- Multiple control options
- High precision control
Sizes:
- A full range of sizes from 100 up to 630mm D
Ranges:
- 37 up to 12,482m3/hr
Control Options:
- No control – plain box only
- MP-Bus (standard), LONWORKS, Modbus,
- KNX (Siemens), MF (no BUS)
- Standard compact control
- Universal fast acting control
Materials:
- Galvanised Steel (Standard)
- 316 Stainless Steel (On request)
Ordering options:

Rectangular Attenuators Type PZX
Reduce sounds and save energy with aerodynamically shaped, flame retardant sound attenuation splitters. Available in in 100, 200 and 300mm thicknesses in five standard cross-section dimensions.
Key Features:
- Aerodynamically shaped sound attenuation splitter reduces drag by 30% (energy savings).
- Sound attenuation splitters are made of flame-retardant material absorption material.
- Splitters available in in 100, 200 and 300mm thicknesses
- Rectangular sound attenuators are available in five standard cross-section dimensions: d/s = 100/50; 100/100; 200/100; 200/200 and 300/100.
Sizes:
- A full range of sizes from 300*300mm up to 1800mm2
Materials:
- Galvanised Steel
Ordering options:

Rectangular CAV Terminal Units
Volume flow controllers type VRRK are used for maintaining a constant volume on extract and supply air systems covering a wide range of sizes and volumes to suit any application. Their task is to keep a default nominal value of the volume flow constantly, lastingly and independently of the varying pressure in the duct.
Constant volume flow controllers work with a smooth-running, asymmetrically angled plate, which guarantees a sensitive responding behaviour even in case of low volume flows.
Adjustable in the field over a set volume range, the Constant Volume Terminal type VRRK ensures a constant supply of air of up to 10,000m3/hr to a room.
Key Features:
- Factory Parameterisation to client requirements
- Maintenance free
- High precision control
- Field Adjustable
Sizes:
- A full range of sizes from 200*100mm up to 600mm2
Ranges:
- 330 up to 10,000m3/hr
Materials:
- Galvanised Steel
Ordering Options:
Please contact for a quotation