CDR

Circular ceiling diffuser for supply or extract air - Flat upper section

Used with the ALS commissioning box
Cleanable
Adjustable slot
Perforated diffuser face = CDD
Non-perforated diffuser face = CDR
Standard colour White RAL 9003
- 5 alternative standard colours
- Other colours upon request

Calculate with your requirements

Design

The CDR and CDD consist of two parts: a flat upper section with a connection spigot having a rubber sealing ring, and a removable diffuser face. Between the upper section and the diffuser face there is a slot which has two alternative positions. The diffuser face of the CDR is non-perforated that of the CDD is perforated. Both CDD and CDR are equipped with acoustic insulation.

Material and surface treatment

The upper section is manufactured in galvanized sheet steel. The diffuser face is made of sheet steel. The complete diffuser is painted both internally and externally.

Standard colour:
- RAL 9003, signal white, gloss 40
Alternative standard colours:
- RAL 9006, white aluminium, gloss 80
- RAL 9007, grey aluminium, gloss 80
- RAL 9010, pure white, gloss 40
- RAL 9005, jet black, gloss 35
- RAL 7037, dusty grey, gloss 30
Non-painted finish and other colours available on request.

AIR FLOW - SOUND PRESSURE ROOM (Lp10A) *)
CDR Size		25 dB(A)		30 dB(A)		35 dB(A)
CDR Size		l/s	m3/h	l/s	m3/h	l/s	m3/h
100		24	86	28	101	34	122
125		32	115	37	133	44	158
160		61	220	71	256	81	292
200		80	288	91	328	105	378
250		100	360	120	432	140	504
315		140	504	165	594	190	684

CDR Size	ALS Size	25 dB(A)		30 dB(A)		35 dB(A)
CDR Size	ALS Size	l/s	m3/h	l/s	m3/h	l/s	m3/h
100	80-100	21	76	27	97	32	115
125	100-125	26	94	33	119	41	148
160	125-160	46	166	58	209	72	260
200	160-200	69	248	82	295	100	360
250	200-250	90	324	110	396	140	504
315	250-315	140	504	155	558	190	684
Data applies to 360° spread pattern. Data for CDR in combination with ALS commissioning box is stated for a total pressure drop of 50 Pa. *) Lp10A = Sound pressure incl. A-filter with 4 dB room attenuation and 10 m² room absorption area.

ALS

Commissioning box for air diffusers

Nordic Swan listed

The product is listed in the database for building products that can be used in Nordic Swan Ecolabelled buildings.

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Include Accessory documents

Document	Article	Document type	Date
Commissioning guide - Air diffusers, VAV/CAV- & Commissioning dampers (pdf 7.73MB)	Air diffusers, VAV/CAV- & Commissioning dampers	IOM Manual	27/02/2025
Installation, commissioning, maintenance (pdf 777.11kB)	CDDb, CDRc	IOM Manual	12/12/2022
Product description - Air diffusers & dampers (pdf 249.19kB)	Air diffusers & dampers	IOM Manual	19/10/2023
Nano certificate (pdf 71.51kB)	Air diffusers	Quality	03/10/2023
Overview - Air diffusers (pdf 4.28MB)	Air diffusers	Brochure	21/02/2025
Circular ceiling diffuser for supply and extract air - Flat upper section (pdf 1.35MB)	CDDb, CDRc	Technical catalogue	05/02/2025

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