Ventilation silencer BDER

air ducttubularcircular

Circular and rectangular silencers for round ventilation ducts Efficient attenuation Absorbing materials polyester (M1 certification) and mineral wool (fire rated) Migration of absorbent fibres prevented Circular: BDER-40 straight M1-certified sound absorber with 50 mm polyester fibre filling BDER-44 straight M1-certified sound absorber with 100 mm polyester fibre filling BDER-45 straight M1-certified sound absorber with 100 mm polyester fibre filling and a 100 mm baffle BDER-30 straight sound absorber with 50 mm mineral wool filling, fire resistance class EI 30 BDER-60 straight sound absorber with 100 mm mineral wool filling, fire resistance class EI 60 BDER-61 straight sound absorber with 100 mm mineral wool filling and a 100 mm baffle, fire resistance class EI 60 Rectangular: BDER-70 fixed casing, glass wool absorbent BDER-71 fixed casing, M1-certified, polyester absorbent BDER-72 openable casing, glass wool absorbent BDER-73 openable casing, M1-certified, polyester absorbent BDER sound absorbers are suitable for use as universal absorbers in air-conditioning systems and in conjunction with controllers, particularly where small absorber size and good attenuation values are required. Tightness class of circular silencers is D (EN 12237) and of rectangular silencers C (EN 1751). Models with polyester filling are certified for cleanliness class M1.