The acoustic louvres of the Alfa GAF series meet the requirements for noise attenuation – for both ventilation systems and industrial applications. When used in ventilation systems, the Alfa GAF series can replace usual industrial louvres, both in intake and exhaust. Therefore, two goals are achieved through a single product: on one hand, it protects the external air intake like any other industrial louvre; on the other hand, it reduces outwards noise levels produced by the ventilation plant – like an ordinary silencer. A double-type version is available, in case higher noise attenuation is required.
In industrial applications, these acoustic louvres can be used both in standard-type version and double-type version. The Alfa GAF series can be used for the realization of enclosures and cabins, or inside technical compartments and, in wider terms, in all solutions for which both air flow and an adequate noise attenuation are needed.
On-demand designs are available.
CASING
The frame is made of galvanized-steel plates, with a depth of 100, 150, 200 and 300 mm. Fins with a 150 mm pitch, made of galvanized-steel plates and shaped to contain soundproof material. Inside, this frame is upholstered with expanded mesh. Both a 40 mm. galvanized-steel perimeter flange and a bird net are available .
Either inox-steel or aluminum frames are available on-demand, as are varnished frames.
SOUNDPROOF MATERIAL
High density rock-wool, reaction-to-fire (DM 26/06/1984) class “0” (not combustible).
INSTALLATION
Screw assembling, both on a 40 mm flange or directly on the duct.
DOUBLE CONSTRUCTION
Screw assembling, both on a 40 mm flange or directly on the duct.
A (on-demand) bird net can be interposed.
USE CONDITIONS
Maximum operating temperature: 250 °C Maximum operating pressure: 2.000 Pa
INSERTION LOSS
Insertion loss, De, is the capacity of the acoustic louvre to reduce outwards noise levels due to the ventilation system. Attenuation values are:
SOUND-INSULATION INDEX
The sound-insulation index is the capacity to prevent sound-waves transit from one environment to another. It characterizes the acoustic features of dividers and partitions, and also those of acoustic wall-louvres. The sound insulation indicated below is certified by means of a test report, according to UNI EN ISO 140- 3:2006 and UNI EN ISO 717-1:2007.
PRESSURE DROP
In the GAFO acoustic louvre series, pressure drops depend both on air-speed inside the duct and on air motion direction. As a matter of fact, usually pressure drops are bigger in ejection than in suction. Pressure drops:
Drop in expulsion
Drop in aspiration