1 Patented Design:Internal and external cover use radiation
surface reinforcement design, elegant appearance, reduce vibration
and noise, improve the heat dissipation
performance. 2
H**-H**0frame
size, all series have oil hole andoil
drainage hole,inner
oil seal, IP*5 protection degree design. 3 Ambient temperature
of **0 degree, the reliable operation is 1 hour, the ambient
temperature of **0 degree, reliable operation are 2
hours. 4 Widely used in
tunnels, hotels, high-rise apartments and other places as
ventilation and smoke exhaust device.