Allegro Industries Manhole Ventilation Passthru

November 2011, Vol. 66 No. 11

The Allegro Manhole Ventilation Passthru (MVP) (patent pending) is designed to maintain and re-direct airflow with minimal restrictions into manholes, sewers and tanks.

The Allegro MVP is the first manhole system that combines three components: a low profile air vent, 90-degree elbow and built-in mounting – all in one unit. Once placed into the manhole, the elbow fits underneath the lower cross bar on the guardrail. The MVP is stabilized by placing the manhole cover onto one of the flat channel corners. The unit comes with a collapsible duct stored in a small storage bag that can be dropped down into the manhole with a quick release of the drawstring. The duct is collapsible, but springs back into shape once the worker is through the opening and down into the manhole. The ducting is vinyl and polyester with PVC coating and heat resistant up to 180 degrees Fahrenheit. The MVP is lightweight at 11 pounds, and made of bright yellow, recyclable, Linear Low Density, high impact Polyethylene to withstand heavy use and temperature extremes. 800.622.3530, allegrosafety.com

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