The air -vent unit heater ensures supply of fresh air into a trolley-bus driver's cab.At low tempretures, the supplied air is heated up to the tempreture of +30 deg C.
The air - vent unit heater consists of the casing, small - sized electrical ventilator, and tube electrical heaters installed on porcelain insulators.

The air - vent unit heater has minimal overall dimensions which allows to accommodate it within limited volumes, in particular, under a ceiling. This contributes to improvement of the conditions of driver's accommodation in a cab and complies with ergonomics requirements.
The air - vent unit heater ensures forced ventilation of a driver's cab at any temperature of external air which contributes to the increase of trolley - bus driver's capacity for work.

Thermal capacity - 1700 W at the voltage of 550 V.
Air flow rate - not less than 30 m3 per hour.
Overall dimensions: length - 520 mm
height - 215 mm
width - 165 mm
Mass - 9.8 kg.