Products > Infrastructure Manhole Frames & Covers Whether by car or on foot, chances are you’ve traversed a Neenah Foundry manhole cover. Millions of our flagship products can be found in cities all across the country. We manufacture cast iron manhole frames and covers in various sizes, shapes, and designs, including logo customization for large projects.. Protect your indoor environments with our internal manhole sealing system, designed to effectively seal and cover manholes. Secure your space today.
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Manhole covers are round because manholes are round. It’s almost like asking why pringles lids are round. And manholes are round for a lot of good reasons: it’s the best shape for resisting horizontal soil loads. It’s easier to manufacture a round shape than a rectangular one.. OSHA has specific requirements for manholes and the removal of manhole covers. Even before a manhole cover is removed, these relevant OSHA requirements come in to play. What are these manhole entry requirements? How does one comply with them?
