CLA-B

Compact sound attenuator with centre baffle for circular ducts

Equipped with an acoustic centre baffle
Extremely low installation height
Very good sound attenuation
Fibre-migration proof
Dim up to 400 air tightness class D
Dim 500 to 800 air tightness class C
Low pressure drop
Mineral wool
Galvanised sheet steel to Environmental Class C3
Fire-resistance class EI30 to EI120*
* See the table for requisite safety distance

Calculate with your requirements

CLA-B is available in a RE:3 version. A RE:3 product is an alternative to our conventional products, systems and services, an alternative which is reduced, reused or revitalised. We ensure a notably lower level of embodied carbon, built-in CO2, and let these solutions wear our RE:3 symbol. Read more about CLA RE:3 here.

Technical description

Design

Material and surface treatment

The standard CLA-B is made of galvanised sheet steel to environmental class C3 (equivalent to M2 as per AMA VVS2016). The connection spigots are fitted with rubber seal rings.

CLA-B up to dim 400 with mineral wool and self-supporting polyester surface layer FarTex^®.

The CLA-B dim 500 to 800.

The sound-attenuating material on dimension 500-800 ISOVER Cleantec^® PLUS, is a type-approved insulation material consisting of long-fibred compressed mineral wool.

The mineral wool is covered with a micro-perforated aluminium foil.

ISOVER Cleantec^® PLUS is type-approved for cleaning using liquids with a plastic brush or even a highpressure cleaning apparatus. Naturally it also conforms to relevant standards regarding cleaning, fibre entrainment, resistance to ageing and emissions, etc. to type-approval number 2706/92.

Installation, commissioning and maintenance

The connection spigots on this product are designed for connection to ducts only. It is important to drive screws or blind rivets into the sheet-metal edge on the connection spigot.

The product can be mounted by means of approved hangers that satisfy the provisions to load bearing capacity rating R corresponding to the fire resistance the structural element of the building, for example load bearing capacity rating R60 for elements of structure to fire-resistance class EI60.

Dimension	Length	Static integral attenuation, dB to ISO 7235
(mm)	(mm)	63	125	250	500	1K	2K	4K	8K
250	500	5	6	8	14	24	32	20	9
250	1000	7	12	17	30	43	40	34	16
315	500	4	6	8	14	25	19	14	8
315	1000	6	10	14	26	45	42	21	12
400	500	4	6	8	14	22	16	10	6
400	1000	5	9	14	23	40	24	13	9
500	600	4	5	15	23	29	20	15	14
500	900	4	6	15	23	29	20	15	14
500	1200	5	7	16	24	30	22	16	14
630	600	3	4	12	19	22	17	12	9
630	900	3	5	12	19	22	17	12	9
630	1200	4	6	13	20	23	18	12	10
800	600	2	2	10	12	11	7	6	2
800	900	2	3	10	12	11	7	6	2
800	1200	3	4	11	13	11	8	7	3

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
Transfer air solutions (pdf 970.08kB)	ALS, CLA-A, GRC, SOTTO	Brochure	06/11/2023
Compact sound attenuator with centre baffle for circular ducts (pdf 341.9kB)	CLA-B	Technical catalogue	14/11/2024
Installation, Maintenance (pdf 239.05kB)	CLA-A; CLA-B	IOM Manual	15/01/2024
Acoustics Overview (pdf 2.43MB)	CLA-A, CLA-B, SORDO-A, SORDO-B, SORDO-C, SORDO-P, SORDO-PF, CALMO, CADENZA, LARGO, LENTO, MORENDO, FACILE, ALD, CTM, CTK	Brochure	08/04/2023
Type approval (pdf 143.18kB)	CLA-A, CLA-B	Quality	14/11/2024

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