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Some of this may not make sense to a lot of you, but to those who understand, there is some really good calcualting here. The main function of this site is to help you figure out different pressures and venting abilities of materials in pipes (the main use would be for gases or liquids). By filling in the data fields, you can figure out the rates for proper venting and flow. Although some of this is definitely not for the general public, the applications are quite remarkable! This is a very quick way to do such laborious calculations. The small bit of data entry necessary is well worth the effort.
Not for those who aren't familiar with the subject matter involved in pipe venting and other similar subjects. Otherwise pretty straight forward and FAST!