PWIIS-EX cut-off explosion-proof dampers

Multi-layer dampers PWIIS-EX with backward blades are designed for air flow adjustment or air flow closure
in the ventilation systems used in the explosion hazard zone.
Such hazards occur in chemical plants, wood-working shops
and varnish manufactures, gas production plants etc. – i.e. wherever the explosion hazard zone is outlined, where the explosive mixtures of gases, mists and dust with air may occur.
The damper PWIIS-EX was tested and classified to II group 2 category according to PN-EN 13463-1:2003; PN-EN 13463-5:2005, which means that it is proper for using in zones
1 and 2 as well as 21 and 22.
The certificate no. KDB08ATEX218 was issued by Central Mining Institute in Katowice.
The damper construction provides tightness within the range
2 class according to EN-1751, thank to special sealing inserts mounted at the end of blades. The drive of individual blades is realised by means of levers and tendons system, under backward arrangement.
The working temperature is within the limits from -20°C to +90°C (+50°C in version with actuator).