• Volute casing with quadrangular frame, manufactured in galvanized steel sheet.
• Single inlet, backward curved wheel with high efficiency, manufactured in galvanized steel sheet and die-cast aluminium hub.
• Execution 5 (impeller directly coupled to flanged motor), rotation RD.
• Double speed asynchronous three-phase motor manufactured according to international standards IEC 600034, IEC 60072, EMC 2004/108/CE, LVD 2006/95/CE, CE marked, IP 55, class F. Double speed by delta/star switching. Electric supply: 400V / 50 HZ three phase.

The SQ-HT series is the solution to problems related to the evacuation of high temperature fumes, therefore ideal for emergency exhaust in case of fire (a solution mandatory in fire safety norms of most Countries). It is already proved by various studies and tests that in case of fire it is worth to exhaust from the premises involved. Such advantages can be summarised in a few points:
1) The mechanical ventilation removes fumes and puts in depression the premise, thus preventing the diffusion of smoke into other rooms, This creates better conditions for the escape of the occupants and simplify the job of the fire brigates.
2) In case of closed premises, it is possible to easily exceed 1000° C, causing the combustion of any material just for heat radiation: a condition that would make useless any external extinguish operation. To keep the temperature relatively low (300°- 400° C) by extracting hot air, means to avoid the collapse of the support structures. In addition, the higher oxygen rate will cause a better combustion and thus, for most materials, a lower production of toxic smoke.
3) The mechanical ventilation allows the location of the exhaust outlets in places away from the one involved, being the SQ-HT series easy to be connected to a duct system.
4) The mechanical ventilation allows the extraction of cold fumes, which, remaining at lower level, are extremely dangerous for the occupants and very difficoult to be removed by static systems.
5) The mechanical ventilation through the SQ-HT fans allows the ventilation of the premises also in normal activity situations (clean air), thanks to the possibility of fitting double speed motors: at low speed for normal ventilation (so with lower noise level) and at high speed for emergency conditions. Obviuosly it is necessary to install the fan with a dedicated power line that automatically operates in case of fire. The capability of the SQ-HT range to work at 400°C for 2 hourshas been tested by an independent notified body.