The Saddle Vent® Tank and Manhole Ventilation provides continuous access and sunlight to manholes during ventilation. Unobtrusive vents take up only 3" of space allowing for easy entrance and exit. Manhole Saddle Vent® is 43 ½"L x 14"W x 8" outside diameter. Tank vents measure 27 ¾"L x 13 ¾" W x 8" outside diameter. Universal mount uses the weight of the manhole cover to hold saddle vent in place. 90 degree elbow maintains unrestricted air flow between vent and ducting. Duct-to-duct connector easily couples ducting together for extended length.