AKR

Circular plenum box without equalising element, for extract air

AKR

CIRCULAR PLENUM BOX FOR UNIVERSAL CONNECTION OF SWIRL DIFFUSERS TYPE VDW, FD, TDF, AIRNAMIC AND XARTO

Standard plenum box for supply air and extract air for circular diffuser faces and for the XARTO type

Plenum box made of galvanised sheet steel with plastic spigot and equalising element made of polyester fleece
Mounting aid for faster and tool-free assembly of the diffuser face
3 suspension lugs for fixing, alternatively a central single-point suspension can be used
For all types of ceiling systems
Equalising element for optimum and therefore quieter flow through the diffuser face with supply air
For comfort zones and industrial zones
Very airtight casing

Optional equipment and accessories

Spigot with damper unit for volume flow rate balancing and lip seal
Internal lining
Powder coating, RAL CLASSIC colour

General information

Application

Plenum boxes for connecting type VDW, FD, TDF, AIRNAMIC and XARTO air terminal devices
Standard plenum box for circular diffuser faces and type XARTO
No tools required to assemble the central fixing screw
For supply and extract air in comfort and industrial zones
For connection to circular ducts according to EN 1506 or EN 13180
For variable and constant volume flows
For all types of ceiling systems

Special features

Fast and tool-free assembly of the diffuser face thanks to the integrated assembly aid
Shorter assembly time due to the reduction to 3 fixing points, central suspension with a threaded rod can be performed by others
Very airtight casing
Easily accessible, therefore easy to clean and no "dirt corners" exist

Variants

AKR-Z-H: Plenum box with equalising element, for supply air
AKR-A-H: Plenum box without equalising element, for extract air

The circular plenum box is optionally available with damper unit and lip seal (DS). The circular plenum box with internal lining (D) is available as an option.

Parts and characteristics

The polyester fleece equalising element improves air distribution so that the diffuser face receives an even airflow. Depending on the diffuser face, lower sound power levels are achieved due to the improved airflow
Cross bar with mounting aid for fixing the diffuser face without tools

Attachments

Spigot optionally with damper unit and lip seal for easier volume flow rate balancing and better sealing to the duct system

Construction features

Spigot suitable for circular ducts to EN 1506 or EN 13180
Equalising element detachable and exchangeable

Materials and surfaces

Casing, cross bar and fixing tab made of galvanised sheet steel
Spigot and mounting aid for central screw fixing made of ABS UL94-V-0, flame retardant
Polyester fleece equalising element, compliant with VDI 6022
Internal lining made of approx. 6 mm thick closed-cell vinyl foam
Lip seal made of Evoprene

Maintenance

Low-maintenance as construction and materials are not subject to wear
If necessary or in case of contamination, it is possible to replace the equalising element.
Inspection and cleaning to VDI 6022

Technical information

Function, Quick sizing, Specification text, Order code

Schematic illustration of VDW-R with circular plenum box and side entry spigot

① Diffuser face

② Central fixing screw

③ Adjustable air control blade

④ Plenum box

⑤ Cross bar

⑥ Equalising element

⑦ Suspension lug

⑧ Spigot

Optional

⑨ Lip seal

⑩ Damper blade for volume flow rate balancing

Plenum boxes are used to connect air terminal devices to circular ducts and to fix the diffuser face.

Type AKR plenum boxes are fitted with an equalising element (for supply air) that ensures an even airflow through the diffuser face.

Depending on the diffuser face, lower sound power levels are achieved due to the improved airflow.

The spigot with optionally available damper unit and lip seal simplifies the volume flow rate balancing for commissioning.

Quick sizing tables provide a good overview of the volume flow rates and corresponding sound power levels and differential pressures. The minimum volume flow rates apply to a supply air to room air temperature difference of -6 K. The maximum volume flow rates apply to a sound power level of approx. 50 dB (A) with damper blade position 0°. Exact values for all parameters can be determined with our Easy Product Finder design program.

Type	AIRNAMIC-R	VDW-R	FD-R	TDF-R	XARTO R/C/Q
01		300 × 8	300	300
02	400	400 × 16	400	400
03		500 × 24	500	500
04					600 625
05	600	600 × 24 600 × 48 625 × 24	600 625	600 625

Type AKR circular plenum boxes for the connection of diffuser faces to circular ducts, suitable for supply air or extract air applications. Supply air plenum boxes are fitted with an equalising element that ensures an even airflow through the diffuser face. The ready-to-install component consisting of the plenum box, the horizontally arranged spigot, with equalising element for supply air, cross bar including quick-fit kit for fixing the diffuser face into place. The diffuser face is fixed to the cross bar by means of a central fixing screw, and the diffuser face can be installed without tools. Spigot suitable for ducts according to EN 1506 or EN 13180.

Special features

Fast and tool-free assembly of the diffuser face thanks to the integrated assembly aid
Shorter assembly time due to the reduction to 3 fixing points, central suspension with a threaded rod can be performed by others
Very airtight casing
Easily accessible, therefore easy to clean and no "dirt corners" exist

Materials and surfaces

Casing, cross bar and fixing tab made of galvanised sheet steel
Spigot and mounting aid for central screw fixing made of ABS UL94-V-0, flame retardant
Polyester fleece equalising element, compliant with VDI 6022
Internal lining made of approx. 6 mm thick closed-cell vinyl foam
Lip seal made of Evoprene

AKR

–

1 Type AKR Circular plenum box

2 System
Z Supply air
A Extract air

3 Spigot
H Spigot horizontal

4 Damper blade and lip seal
No entry required: None
DS With damper unit and lip seal

5 Internal lining (insulation)
No entry required: None
D With internal lining

6 Box type
01
02
03
04
05

7 Surface
No entry required: Raw, galvanised steel
P1 Powder-coated, specify RAL CLASSIC colour

Order example: AKR-Z-H-DS-.../05/...

Air conditioning system	Supply air
Connector	Spigot horizontal
Damper blade and lip seal	With
Lining (insulation)	Without
Box type	05
User interface	Raw, galvanised steel

Dimensions and weight

Type	ØD	H	ØD₁	R	Weight
Type	mm				kg
01	158	243	273	139	1.6
02	198	290	362	166	2.4
03	198	290	460	166	3.1
04	248	344	460	195	3.5
05	248	344	573	195	4.4

Product details

Volume flow rate balancing/commissioning

When several diffusers are connected to just one volume flow controller, it may be necessary to balance the volume flow rates.

Circular plenum boxes with damper unit and lip seal (-DS) have a damper unit that can be adjusted in 15° steps
Adjustment is via a manual lever which is freely accessible when the diffuser face is removed
Adjustment range is 0° - 90° in 15° steps

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AKR