uninterruptible power supply (ups) building automation and control access control building management emergency lighting fire and security network infrastructure and connectivity power monitoring and control power quality and power factor correction sensors & room units valves and valve actuators variable...
speed screw compressor description highlights standard features optional features air cooled water chiller with variable speed screw compressor. as a leading engineering institution in air conditioning high quality products, petra is proud to introduce its revolutionary design for its new line of vfd...