**FREIGHT CHARGES TO ONE DESTINATION(CONTINENTAL USA) ARE INCLUDED IN THE PRICING OF ALL SUPER VAC FANS AND ACCESSORIES!
Manhole Adapters are a great way for utility companies and more to place blowers/exhausters safely atop of manholes securely. These adapters allow negative pressure fans to pull smoke, toxic fumes and more from deep in the manhole.
These rugged aluminum adapters come in 4 sizes and sit in manhole rings to provide a stable mounting surface for box fan.
Note: Not for use if manhole is the only means of egress.