black white ironing board cover_145 cm ironing board cover
As commonly made out of concrete, cast iron, or a combination of concrete and iron, manhole covers are made for the safety of anybody passing above the hole of a sewer. At the same time, standard manhole cover size is being designed to fit in a person size as its second purpose is through it, technically trained individual can pass through it when maintenance is needed on the sewer or during the call of fixing on the underground pipes.
There are three different types of manholes: shallow, normal and deep. “Normal” manholes are typically 4- to 5-feet deep and wide enough for the average person to fit in. Shallow manholes are 2- to 3-feet deep, often placed at the start of a sewer branch and in areas with low traffic. Manholes with a depth greater than 5-feet are considered deep and usually have an entry method like a ladder built-in, as well as a heavier cover.