The Q-Rohr®, with its patented system of flame absorbing and dust retaining materials, guarantees hazard-free indoor explosion venting. Difficult to access machines or facilities located amidst production halls can be quickly, simply and safely vented, without cost-intensive, space issues and time-consuming reconstruction. When deploying this maintenance-free protection system: A purely passive solution; no additional operating costs are incurred. Q-Rohr® is the only system worldwide that is approved for deployment in Zone 22 according to VDI-3673, EN 14797, EN 16009 and NFPA 68 and certified by FM Global. Insurance companies across the globe recognize the Q-Rohr® as a safe system for flameless explosion venting.