SORDO-B

Sound attenuators with acoustic centre baffle for circular ducts

Very good sound attenuation
100 mm mineral wool
Low pressure drop
Ø 315–400 with air tightness class D
Ø 500–800 with air tightness class C
Built for low CO2 footprint (Ø 315–400)
Fire resistance equivalent to class EI30 to EI120*
*See table for requisite safety distance

Calculate with your requirements

SORDO-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 RE:3 here.

Design

Material and surface treatment

SORDO-B dim 315 to 400 with 100 mm thick mineral wool. The standard SORDO is made of galvanised sheet steel to Environmental Class C3 (equivalent to M2 to VVS-AMA 98) The SORDO-B dim 315 and 400 is fibre-migration-proof thanks to our solution with self-supporting surface layer FarTex^®, which is approved with regard to cleaning, fibre migration, resistance to ageing, emissions, etc. The connection spigots are fitted with rubber seal rings.

The SORDO-B dim 500 to 800 is made of galvanised sheet steel to Environmental Class C3 (equivalent to M2 to VVS-AMA 98 . Sound attenuating material consisting of 100 mm thick long-fibred, compressed rock wool lined with EUROLON. EUROLON withstands substantially higher air velocities and mechanical strain than that in other makes of ordinary staple fibre. The sound attenuating material is also covered with perforated sheet steel outside the EUROLON layer. The connection spigots are fitted with rubber seal rings.

Installation, commissioning and maintenance

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 R 60 for elements of structure to fire-resistance class EI60.

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.

Dimension	Length	Static integral attenuation, dB to ISO 7235
(mm)	(mm)	63	125	250	500	1K	2K	4K	8K
315	500	4	8	10	17	24	28	19	11
315	800	4	9	13	22	31	35	21	13
315	1100	5	10	15	27	39	42	23	15
400	500	4	8	9	17	24	28	18	12
400	800	4	8	11	21	29	31	19	12
400	1100	5	9	13	25	34	34	20	12
500	900	3	5	10	20	29	24	18	17
500	1200	3	7	13	25	35	30	21	19
630	900	3	4	8	14	19	19	13	12
630	1200	4	6	12	17	21	24	17	16
800	900	1	2	5	11	12	14	8	9
800	1200	1	3	7	13	14	18	11	10

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Include Accessory documents

Document	Article	Document type	Date
Sound attenuator with centre baffle for circular ducts (pdf 353.85kB)	SORDO-B	Technical catalogue	20/02/2025
Installation, Maintenance (pdf 179.01kB)	SORDO-B	IOM Manual	21/02/2025
Building product declaration (pdf 48.89kB)	SORDO-B	Quality	24/05/2018
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

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