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.
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)
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)
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.
