Allegro helps to make your confined space jobs easier with equipment built to the highest standards. Features durable ABS housing, metal safeguards, and steel fan 3 1/2 HP gasoline engine with sturdy metal base System includes: blower, 6' and 15' of ducting with storage bag and Manhole vintilation Passthru. Free Air: 2000-3000 CFM One 90 degree Bend: 1500-2500 CFM Two 90 degree Bends: 1350-2350 CFM. Allegro's Complete Ventilation Systems include all the most-asked-for equipment for your confined space site. The systems include a choice of Allegros most popular blowers, six feet and fifteen feet of ducting with a storage bag and Manhole Ventilation Passthru. The Centrifugal Blower Systems offer lightweight portability with the highest output available.
The new Manhole Ventilation Passthru combines the low profile manhole air vent, 90 degree elbow and built-in mounting all in one easy assembly. Made from Linear Low Density Polyethlene. The low profile elbow fits underneath the lower cross bar of the guardrail. The manhole cover fits into flat channeled corner for stabilization. Duct is collapsible for easy entry - springs back into shape once the worker is down into the manhole. Weighs only 11 pounds! Click image above for picture of blower that comes with this system.