Specifications:
The document details various models of transit grilles, specifying dimensions and types. The grilles are available in different sizes ranging from 200x100 mm to 1000x400 mm. Two main types are described: GTA (grille without auxiliary frame) and GTA-C (grille with auxiliary frame).

Construction and Materials:
The grilles are constructed from anodized aluminum, designed for air flow transit through doors or thin walls. Fixing is done using frontal screws, and auxiliary frames are available as accessories.

Fixing Methods:
Several fixing methods are outlined, including using magnets, clips, screws, and clamps. The document provides a table indicating the number of holes required for mounting screws based on grille dimensions.

Performance Data:
A selection table provides performance data for each model, including the area (Ak), air flow rate (Q in m3/h), sound power level (LWA in dB(A)), and pressure drop (Dpt in Pa). The data is presented for minimum and maximum values.

Quick Selection Diagram:
A diagram is included to assist in the quick selection of grilles based on air flow rate and sound power level.

Key Parameters:
- Pitch: 20 mm
- Material: Anodized aluminum
- Fixing: Frontal screws
- Accessories: Auxiliary frame
- Air flow rate range: 30 to 1450 m3/h
- Sound power level range: 22 to 45 dB(A)
- Pressure drop range: 5 to 20 Pa