The first manhole system that combines the low profile manhole air vent, 90 deg 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 is vinyl and polyester with PVC coating, heat resistant up to 180 deg 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.

Linear low-density polyethylene (LLDPE)
Manhole cover fits into flat channeled corners for stabilization
Small storage bag holds ducting
Quick release draw string to drop ducting into manhole
Collapsible duct for easy entry springs back into shape once worker is down into the manhole
Reducing overall size, storage and shipping cost

Allegro 9510-50 Manhole Ventilation Passthru - Each

Product Description