RAMFAN UB 20 Manhole Entry SystemFEATURES A complete system for ventilating manholes and vertical confined spaces while allowing easy entry and exit, the RAMFAN UB 20 has a saddle vent, which allows unobstructed airflow down through the vertical opening. The 15 foot (4. 6 m) duct can be attached above or below ground to meet the site's ventilation needs. The system includes: UB20 Blower Exhauster, Saddle Vent and Mount, 90 Degree Elbow, Quick Couple Canister, 5 foot x 8 inch (152 x
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