An acoustic door louvre is somewhat of a contradiction in terms; a louvre is designed to allow the passage of air through a door, but at the same time it will permit the passage of sound. The SBLS is designed to reduce the amount of sound passing through the door whilst still allowing fresh air to flow. It has become the accepted solution by many door manufacturers in noise attenuation through doors.
In acoustic tests at The School of Computing, Science and Engineering in the University of Salford's UKAS accredited laboratory, the SBLS has achieved 16 dB Rw. The system incorporates an SB Sound Block which is only 14mm thick and manufactured from sound deadening material. This is sandwiched in the door between a FDLS louvre one side of the door and a DRDL louvre on the other side; two totally different louvre designs. This allows air to flow through the door but reduces the passage of noise.
Critically, the SBLS is designed to work on 44mm thick doors. There are many acoustic louvre panels available for roof top plant rooms, cooling towers, boiler rooms, and air handling systems in all types of buildings which include deflectors and baffles sometimes many feet thick, but the SBLS was specially designed to suit standard 44mm thick doors.
The FDLS and DRDL louvres either side are of all metal construction which results in a long and trouble free life. The SB Sound Block has an aluminium frame and galvanised steel mesh holding STC3003 Sound Sheet material and other sound deadening material in place. It is similar to our FB Fire Block in appearance.
ACOUSTIC RATING 16 dB Rw. Copy of Salford University Test Report No: 132-1 dated 12.08.2010 available on request. Test Ref AC09/173/13. Tested to the International Standard Method For Measurement of Airborne Sound Insulation Of Building Elements BS EN IS0 140-3: 1995.
INSTALLATION Please note this product should be fitted in the factory with the door in the horizontal position. This ensures the correct position of the SB Sound Block.
DOOR THICKNESS To suit 44mm minimum thickness upwards. There is no maximum door thickness, although it will be necessary to provide some lateral support for the 14mm thick SB Sound Block on doors thicker than 44mm.
FREE AIR FLOW 30% free area.
FIXINGS Supplied with No 8 Phillips head screws. Special security fasteners available.
