Openchannelflow offers several top styles to allow you to customize our fiberglass manholes to suit your specific site needs.
Each top style is designed for a specific type of application or to solve a particular access requirement.
Of the top styles offered, the Aluminum Top and Domed Top styles are "complete" in that no additional components are required to finish the installation.
The H-20 Traffic Reducer requires grade rings, a frame, and a cover to complete the installation. These can be either locally sourced, or Openchannelflow can provide a composite stack with the fiberglass manhole for a complete solution.
Open Top manholes typically require a dedicated equipment shelter over them - or some other protection - to limit unauthorized access and the possibility of inflow.
Aluminum Top
- For pedestrian walkways or low-profile installations
- Available in watertight and non-watertight areas
- An array of accessories available
- Sizing:
- Flush with or just above the surface grade
- Available for:
- 4', 5', 6', and 8' [1.22, 1.52, 1.83, and 2.44 m] diameters
Fiberglass Domed Top
For grassy (non-traffic/pedestrian) areas
Most popular
Fully opening for maximum access
Easy entry / exit
Heavy-duty stainless steel hardware
Sizing:
12 to 18-inches [30.48 to 45.72 cm] above the surface grade
Available for:
4', 5', and 6' [1.22, 1.52, and 1.83 m] diameters
H-20 Traffic Reducer
For traffic / parking lot / loading dock / warehouse floor areas
Large 31 3/4-inch [80.65 cm] standard opening
22 1/2 and 38-inch [57.15 and 96.52 cm] openings available
Optional composite grade rings, frames, and covers available for a full composite solution
Sizing:
12-inches [30.48 cm] below the surface grade
For customer supplied grade rings, frame, and cover
Available for:
4', 5', and 6' [1.22, 1.52, and 1.83 m] diameters
Open Top
- Like the name implies, an open area at the top of the manhole
- Typically covered with a hinged, narrow opening fiberglass grating
- A good idea when the manhole is covered by a shelter or has access restricted
Wide array of accessories available
- Sizing:
- Usually flush with or just above the surface grade
- Available for:
- 4', 5', 6', and 8' [1.22, 1.52, 1.83, and 2.44 m] diameters