H-20 Reducer Top manholes are specially designed for installation in areas where vehicular traffic may be present. Utilizing a specially designed reducer, H-20 Highway Loading manholes use standard grade rings, frames, and covers.
Suitable Locations
H-20 Highway Loading manholes are for use in areas where vehicular traffic may be present (roads, parking lots, loading dock areas) or where a low profile installation is required.
Availability
4', 5', and 6' [1.22, 1.52, and 1.80 m] diameter manholes.
Sizing Traffic Reducer Top Manholes
H-20 Highway Loading manholes are sized to be 12-inches [30.48 cm] below the finish grade. This allows standard grade rings / frames / covers to bring the installation up to grade.
Should a manhole be incorrectly and the Top be too far below grade, Openchannelflow offers manhole extensions to help bring the top back up to its desired height.
Image: Hamilton Kent