MANHOLE CASTING REFERENCE GUIDE
MANHOLE CASTINGREFERENCE ........................................ ........2Load ........................................ .....................3Key Dimensions of Round Frame and Cover ................3Key Dimensions of Inlet Frame and Grate ....................4Frame Designs ........................................ ......................5Grate Designs ........................................ .......................6Curb Inlets or Combination Inlets .................................7Watert ight Frames and Covers .....................................8Ai rport Castings ........................................ .....................8Manhole Features ........................................ .............9-10NATIONAL PRECAST CONCRETE ASSOCIATIONWith nearly 1,000 member companies, NPCA serves as the voice of the precast concrete industry in the United States and Canada.
4 QUICK REFERENCE Clear Opening Clear opening is the length of the opening located near the top of the frame. It is also known as the “C” dimension.
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