A system features section that has been subdivided into mechanical and electrical systems and clarified.Clearer guidance about costs, expanded to include energy consumption, maintenance, operation and life cycle cost information.Greatly increased guidance about space and weight allowances.This popular publication has been updated and expanded to include more detailed information and now comes in a more user-friendly spiral-bound format. The guide is useful for approximately calculating values, setting outline targets and rapidly comparing different options to inform the early stages of the design process. The 5th edition of Rules of Thumb has been created by referencing various contemporary sources in the building services industry and can reasonably be held to reflect current design practices. Rules of Thumb are general principles derived from practice and experience rather than precise theory. "This is an excellent document" Mitch Layng, PRUPIM
" This new version is a welcome update to my library in view of the changes/update in costs information"Richard Pope, Babcock International Group
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