Secondary Author(s)

Stroer, Dennis; Hoak, David; McIlvaine, Janet; Chandra, Subrato

Report Number




Ducts; Buildings; Manufactured Houses; Energy Consumption


The U.S. Department of Energy's (DOE) Building America Industrialized Housing Partnership (BAIHP) has collaborated with two of its industry partners to work on a portion of the project that relates to the construction and evaluation of prototype interior duct systems. In 2006, work began on a duct system design that would locate the entire length of duct work within the air and thermal barriers of the envelope. One of these designs incorporated a high-side supply register that connects to the conventional floor duct. The other design utilized a single soffit located within the conditioned space at the marriage line. The Florida Solar Energy Center's (FSEC) Manufactured Housing Lab (MHLab) was retrofitted with an interior soffit duct. The duct system was added on so that either the attic duct system or the new interior duct system would be able to supply air to the conditioned space using the same mechanical equipment. The initial results of this work show approximately a 10% to 20% heating/cooling savings when compared to conventional attic duct work construction techniques and nearly 7% savings when compared to a conventional in-floor system.

Date Published



Original Publication: Moyer, N., Stroer, D., Hoak, D., McIlvaine, J., and Chandra, S., "Research Results from A Few Alternate Methods of Interior Duct Systems in Factory Built Housing Located In the Hot Humid Climate", Sixteenth Symposium on Improving Building Systems in Hot and Humid Climates, December 15-17, 2008, Dallas, TX.

Local Subjects

Buildings - Ducts; Buildings - Energy Consumption; Buildings - Manufactured Houses


FSEC Energy Research Center® Collection



Rights Statement

In Copyright