CDD

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

Used with commissioning box ALS
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

Functions
- Ventilation

Calculate with your requirements

Technical description

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 AcousticInsulation.

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) *)
CDD Size		25 dB(A)		30 dB(A)		35 dB(A)
CDD Size		l/s	m3/h	l/s	m3/h	l/s	m3/h
100		33	119	37	133	44	158
125		44	158	49	176	56	202
160		70	252	82	295	95	342
200		95	342	110	396	120	432
250		115	414	135	486	160	579
315		150	540	180	648	210	759

CDD Size	ALS Size	25 dB(A)		30 dB(A)		35 dB(A)
CDD Size	ALS Size	l/s	m3/h	l/s	m3/h	l/s	m3/h
100	80-100	20	72	26	94	32	115
125	100-125	27	97	35	126	43	155
160	125-160	46	166	57	205	70	252
200	160-200	68	245	82	295	100	360
250	200-250	92	331	120	432	140	504
315	250-315	135	486	160	576	190	684
Data applies to 360° spread pattern. Data for CDD 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

Filter

Include Accessory documents

Document	Article	Document type	Date
Installation, commissioning, maintenance (pdf 777.11kB)	CDDb, CDRc	IOM Manual	12/12/2022
Circular ceiling diffuser for supply and extract air - Flat upper section (pdf 1.35MB)	CDDb, CDRc	Technical catalogue	05/02/2025
Air Overview Brochure (pdf 13.04MB)	Overview Brochure	Brochure	26/09/2023