Description
24” Round ADA Manhole Frame & Grate – H-20 Heavy Duty Cast Iron
The 24” Round ADA Manhole Frame & Grate is designed for infrastructure applications requiring secure underground utility access, efficient stormwater conveyance, and accessibility-conscious grate design within a single casting assembly. Manufactured from high-strength gray iron conforming to ASTM A48 Class 30B or Class 35 requirements, this heavy-duty frame and grate system is engineered to provide dependable performance in municipal infrastructure, transportation corridors, public spaces, utility networks, and commercial developments.
Unlike traditional solid manhole covers that provide access only, ADA manhole grates combine utility access functionality with hydraulic drainage performance. The ADA-compliant slot configuration allows surface runoff to enter underground collection systems while supporting accessibility-focused environments where pedestrian circulation, mobility devices, and public-use considerations are important project requirements. This makes the assembly particularly well suited for sidewalks, streetscapes, transit facilities, plazas, campuses, parks, and mixed-use developments where drainage infrastructure must coexist with pedestrian activity.
The round configuration has long been preferred by engineers and municipalities because of its inherent structural advantages. Circular castings distribute loading forces uniformly throughout the frame and grate assembly while eliminating the possibility of incorrect installation orientation. Combined with H-20 highway loading capability, this design provides the strength necessary for demanding infrastructure environments while maintaining reliable access to underground utility systems.
This heavy-duty casting features a 24-inch grate diameter, a 22-inch clear opening, and a 34-inch outside frame diameter. Multiple frame heights are available to accommodate varying site conditions and installation requirements. The result is a versatile infrastructure component capable of serving drainage systems, utility vaults, stormwater facilities, access chambers, and public infrastructure projects requiring both access and runoff management capabilities.
ADA grate designs are commonly specified in accordance with accessibility-focused infrastructure practices and guidance established by the U.S. Access Board. The grate opening configuration is designed to promote safer pedestrian mobility while supporting effective stormwater intake and surface drainage performance.
For municipalities and public works agencies seeking durable infrastructure products, this casting complements Amercast’s complete line of Manhole Frames & Covers, Custom Manhole Covers, Decorative Manhole Frames & Covers, and Catch Basin Frames & Grates designed for municipal drainage and utility infrastructure systems.
Manufactured from ASTM-compliant gray iron and designed for long-term service, this casting provides exceptional compressive strength, dimensional stability, impact resistance, and durability. Cast iron remains one of the most trusted materials for underground utility access products because of its proven ability to withstand traffic loading, weather exposure, freeze-thaw cycles, and decades of field service.
Amercast also offers custom cast-in markings, utility identifiers, municipal seals, agency branding, project names, and proprietary logos. These permanent cast features support utility asset management programs while helping infrastructure owners maintain consistent identification standards throughout their utility networks.
Features & Benefits
- Manufactured from ASTM A48 Class 30B or Class 35 gray iron
- H-20 highway load rated construction
- ADA-compliant thin slot grate configuration
- Combines utility access and stormwater collection functionality
- 24-inch grate diameter
- 22-inch clear opening
- 34-inch outside frame diameter
- Available in multiple frame depths
- Designed for municipal and transportation infrastructure
- Supports pedestrian-oriented environments
- Promotes efficient runoff interception and drainage
- Excellent resistance to impact, wear, and environmental exposure
- Precision-cast frame and grate assembly
- Custom logos, municipal seals, and utility markings available
Applications
- Municipal stormwater infrastructure
- Public works construction projects
- Utility access chambers
- Streetscape improvement programs
- Sidewalk drainage systems
- Transit facilities and transportation hubs
- University and educational campuses
- Public parks and recreation areas
- Commercial developments
- Mixed-use developments
- Government facilities
- Utility corridor installations
- Urban redevelopment projects
- Pedestrian plazas and gathering spaces
- Transportation infrastructure improvements
Product Specifications
| Product Type | ADA Manhole Frame & Grate |
| Cover Diameter (C) | 24" |
| Clear Opening (O) | 22" |
| Outside Diameter (OD) | 34" |
| Available Heights (H) | 3", 4", 6", 7", 8" |
| Cover Thickness (T) | 1-3/8" |
| Material | ASTM A48 Class 30B or Class 35 Gray Iron |
| Load Rating | H-20 Highway Rated |
| Grate Style | ADA Thin Slot |
| Shape | Round |
| Custom Markings | Available |
Frequently Asked Questions
What is the purpose of an ADA manhole grate?
ADA manhole grates provide underground utility access while allowing stormwater to enter drainage systems through an accessibility-conscious grate pattern.
What does H-20 highway rated mean?
H-20 indicates that the casting is designed for infrastructure environments exposed to vehicular traffic and roadway loading conditions.
Why choose a grate instead of a solid manhole cover?
A grate allows stormwater to enter underground systems while maintaining access to utility infrastructure.
Are custom logos and utility markings available?
Yes. Amercast can manufacture custom castings featuring municipal seals, utility identifiers, project names, agency branding, and proprietary customer logos.
What frame depths are available?
This product is available with frame heights of 3", 4", 6", 7", and 8".
Where are ADA manhole grates commonly specified?
ADA manhole grates are frequently utilized in sidewalks, plazas, transit facilities, streetscapes, campuses, parks, municipal infrastructure projects, and public-use environments.
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