Allegro 9510-50 8" X 20" Polyester Vinyl Manhole Ventilation Passthru (1/EA) Mops & Handles It is strongly recommended to

It is strongly recommended to have personal fit testing of hearing protectors before using

all day long

2 L) flow control

and asbestos and lead paint abatement

Allegro 9510-50 8" X 20" Polyester Vinyl Manhole Ventilation Passthru (1/EA) Mops & Handles It is strongly recommended toAllegro's MVP is 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 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 and heat