Hello welcome to use the Sinar Mas Group of Shandong Wang Lei, ventilation and air conditioning equipment plant products. Since 2000 it has passed the ISO9001 international quality system certification, ISO14001 environment system certification, the state compulsory product certification (3c) "Credible" enterprise. Applicable PYK multi-leaf smoke vents: general mounted on the aisle side walls of the room with no windows or exhaust system, usually normally closed, smoke detector send out alarm signals when the fire occurred, the control center through DV24V electricity to the exhaust port control mechanism, so that the exhaust port to quickly open, you can also manually smoke. Sales Tel: 15954772213 Contact: Wang