MANY YEARS AGO, I paid good money out of my own pocket to learn how to design a duct system. I won’t say to whom I paid this money, because I got ripped off. What I “learned” was how to find .1 on a ...

Screw blowers use internal compression, lobed blowers use external compression. Screw blowers are more efficient, potentially cutting energy use in half. Resources: Atlas Copco, www.atlascopco.com ...