This Allegro 9510-50 manhole ventilation passthru (MVP) is the first manhole system that combines the low profile manhole air vent, 90° elbow and built in mounting all in one unit. Comes with a collapsible duct, for easy entry, stored in a small storage bag that can be dropped down into the manhole with a quick release of the drawstring. The collapsible duct springs back into shape once worker is down into the manhole. The ducting is vinyl and polyester with PVC coating, heat resistant up to 180° F, meets ASTM 227 specs and is UL 94V-0 flame retardant. The manhole cover fits into a flat channel corner for stabilization. Compact, lightweight and made from Linear Low Density Polyethylene (LLDPE), this unit is easy to store and ships in one small carton. Recyclable.
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Check out Masterman's selection of Manhole Safety for items commonly used with rescue retrieval systems.