CLA-A

Compact sound attenuator for circular ducts

Extremely low installation height
Very good sound attenuation
Air tightness class D
M1 class
Low pressure drop
Type-approved
Built for a low CO2 footprint "EPD"
Fire-resistance class EI30 to EI120*
*See the table for requisite safety distance

Calculate with your requirements

CLA-A 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

Adaptation

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
100	500	7	9	14	26	34	42	35	26
100	1000	7	17	26	44	50	50	50	39
125	500	5	9	13	21	29	35	31	20
125	1000	7	16	23	39	50	50	47	35
160	500	5	8	13	17	23	31	21	17
160	1000	7	13	22	32	45	50	38	25
200	500	5	8	11	15	20	22	14	14
200	1000	7	13	20	28	40	45	27	20
250	500	5	6	8	11	15	16	10	7
250	1000	6	11	15	20	28	31	18	14
315	500	4	6	7	9	12	8	8	5
315	1000	6	10	12	17	24	21	12	7
400	500	4	6	7	9	12	8	6	4
400	1000	5	9	12	16	23	14	8	6

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
Bundle Solution CLA-A and REACT V (pdf 1.51MB)	CLA-A, REACT V	Brochure	29/10/2024
Transfer air solutions (pdf 970.08kB)	ALS, CLA-A, GRC, SOTTO	Brochure	06/11/2023
Compact sound attenuator for circular ducts (pdf 293.27kB)	CLA-A	Technical catalogue	15/01/2024
Installation, Maintenance (pdf 239.05kB)	CLA-A; CLA-B	IOM Manual	15/01/2024
Building product declaration (pdf 50.23kB)	CLA-A	Quality	24/05/2018
Type approval (pdf 137.87kB)	CLA-A, CLA-B	Quality	20/02/2024
Environmental Product Declaration (pdf 809.51kB)	CLA-A (RE3)	Quality	23/08/2024
Environmental Product Declaration (pdf 789.79kB)	CLA-A	Quality	23/08/2024
M1 Certificate (pdf 167.9kB)	CLA-A; SORDO-A	Quality	12/05/2023
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

Whilst we have made every effort to ensure information on this website is up to date and accurate, the technical specification and availability of products/services listed on this website may vary market to market and are subject to change without notice. Please contact your regional representative or visit your local website for further details.