General Description
The document describes a range of ventilation units called Airbox, equipped with centrifugal fans featuring an external rotor motor. These units are designed for modern installations, offering silent operation, durability, versatility, and ease of installation. The casing is made from aluminum profiles with high-impact resistant plastic corners, and all panels are interchangeable.

Characteristics
The Airbox units use metallic metric thread screws for quick and professional assembly. A variety of mounting accessories are available, including flexible gaskets, shutters, grills, hoppers, visors, dampers, silencers, and heating/cooling coils. The standard series features zinc-plated steel panels with 25mm fiberglass insulation for sound absorption, with options for 50mm high-density fiberglass insulation.

Fan Specifications
The centrifugal fans have variable airflow and are equipped with an external rotor motor with thermal protection. The voltage is fully controllable via electronic control or transformer. The fans are extremely silent and vibration-free, with high-efficiency radial impellers balanced according to DIN/ISO 1940 standards.

Control and Regulation
Manual controllers are available for each fan type, with options for control signals (0-10V or 4-20mA), two-speed switches, and motor protectors. The document provides detailed specifications for various Airbox models, including voltage, power, intensity, speed, noise level, and regulator types.

Dimensions and Models
The document lists dimensions for various Airbox models, such as Airbox 22, 25, 33, 43, 54, 64, 77, and 97, with specific measurements for each model.

Accessories
Available accessories include control shutters, flexible gaskets, protection visors, flanges, and hoppers. Additional accessories like silent-blocks, hoppers, and roof filters are also mentioned.

Contact Information
The document provides contact details for Airtecnics, located in Castellar del Vallès, Spain, including phone, fax, email, and website information.