What is the minimum size for new manhole covers?

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Multiple Choice

What is the minimum size for new manhole covers?

Explanation:
Opening width for a new manhole cover is driven by maintenance access and safe handling. Eighteen inches is the smallest opening that still lets a worker with typical gear remove and replace the cover and maneuver necessary tools and inspection equipment into the manhole. It also lines up with standard frame and seating dimensions so the cover fits securely and can bear the expected loads. Larger sizes—twenty-four inches or thirty inches—are common in many installations, but the minimum size ensures a practical balance between usability and handling. A smaller opening, like twelve inches, would make access impractical and create safety risks.

Opening width for a new manhole cover is driven by maintenance access and safe handling. Eighteen inches is the smallest opening that still lets a worker with typical gear remove and replace the cover and maneuver necessary tools and inspection equipment into the manhole. It also lines up with standard frame and seating dimensions so the cover fits securely and can bear the expected loads. Larger sizes—twenty-four inches or thirty inches—are common in many installations, but the minimum size ensures a practical balance between usability and handling. A smaller opening, like twelve inches, would make access impractical and create safety risks.

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