porous concrete pipe
41Fouling — This article is about fouling in engineering. For uses of the term foul outside technology, see Foul (disambiguation). Not to be confused with fowling. Heat exchanger in a steam power plant, fouled by macro fouling …
42Ground-coupled heat exchanger — Earth cooling tubes or earth warming tubes (also known as ground coupled heat exchangers) utilize the earth s near constant subterranean temperature to warm or cool air for residential, agricultural or industrial uses. They are often a viable and …
43Basement waterproofing — refers to techniques used to prevent water from entering the basement of a house or other building. Effective below ground waterproofing will include both drainage and sealers.Waterproofing is needed anytime a structure is built at ground level… …
