Technical Description
The document provides a technical description of two types of acoustic transfer grilles: the GFV 91 rectangular grille and the GFV 90 circular grille. These grilles are designed for acoustic attenuation and are suitable for wall or door mounting.

Specifications

• GFV 91: Rectangular shape, available in models with flow rates from 60 to 300 m3/h. Example: Model 500 x 50 with a flow of 200 m3/h results in a sound level of 30 dB(A) and a pressure drop of 32 Pa.
• GFV 90: Circular shape, available in models with flow rates from 70 to 210 m3/h. Example sizes include 100 mm, 140 mm, and 180 mm diameters.

Dimensions and Weight

• GFV 91: Available in sizes ranging from 300 x 50 mm to 850 x 50 mm, with weights from 1.6 kg to 3.6 kg.
• GFV 90: Available in diameters from 100 mm to 180 mm, with weights from 1.4 kg to 3.2 kg.

Construction and Composition
The grilles are constructed from steel and feature two transfer units and two assembly supports. They are finished with white paint (RAL 9010) and are available only in standard dimensions. Fixing is done by screws.

Advantages
The grilles incorporate acoustic attenuation and can be mounted on walls of any thickness.

Application
These grilles are used for acoustic transfer on walls or doors, providing sound attenuation in various settings.

Packaging
Each grille is individually packaged in plastic film.

Specification
The acoustic wall transfer grille consists of two grilles with internal sides covered with acoustic insulation. It is fixed by a support frame screwed onto the wall or door and is made of steel, painted white. Available in types GFV 90 or 91, under the France Air brand.