The first manhole system that combines the low profile manhole air vent, 90? elbow, and built-in mounting all in one unit. This unit comes with a collapsible duct, for easy entry, stored in a small storage bag that can be dropped into the manhole with a quick release of the drawstring. The Collapsible duct springs back into shape once the worker is down into the manhole. The ducting made from neoprene-coated, single ply, vinyl and polyester materials, heat resistant up to 250? F (121.1? C), 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) conductive material, this unit is easy to store and ships in one small carton. Recyclable.
