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Guide describing how and where to install ducts, to ensure enough cavity space to avoid compression of the flex ducts or duct insulation.

Guide describing the use of building cavities as supply or return ducts.

Guide describing how to correctly install flex ducts without excessive coils or loops.

Guide describing how to correctly install flex ducts without kinks or sharp bends.

Guide describing how to design HVAC systems to be located within the conditioned space of the home, either in a utility closet or in an attic, basement, or crawl space.

Guide describing gas-fired boilers and hot water heat distribution systems used for home heating.