The DUX multi-directional Pressure Relief Vent has been uniquely designed for Halocarbon agents to ensure that over or under pressures on discharge are capped below the structural integrity limit of your enclosures. Not many consultants, designers or end users are aware of the magnitude of the negative or positive pressures that Halocarbons can create on discharge. In fact in most situations all Halocarbons produce greater negative pressure on discharge than positive (humidity dependant). Therefore you need a multi-directional pressure relief vent that can cater for pressures in both directions. The DUX model of vents has a unique mechanism that allows vent blades to pivot from one direction to the other in a single vent design.