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Basics & Theory

NARI: Overview of Small Duct HVAC System
US National Association of Remodeling Industry says small duct high velocity systems, like this Unico System, are those that deliver conditioned air through smaller ductwork and flexible supply tubes at a higher static pressure (i.e. velocity) than conventional forced air equipment.
Issues & Performance

CMHC: Duct Leakage Tests In Small Diameter Ducting
CMHC provides results of tests on five houses with small diameter ducting to determine the range of leakiness of these systems. (PDF)

US DOE: Cooling Season Performance Of Ducts In Multi-Story Townhomes
US Department of Energy report Comparative Cooling Season Performance of Air Distribution Systems in Multi-Story Townhomes shows small-diameter duct systems provide better comfort than conventional systems and smaller ductwork is easier to bring into conditioned space. (PDF)

US DOE: Performance of Varied Airflow Small-Diameter Duct System
US Department of Energy study Measured Performance of a Varied Airflow Small-Diameter Duct System tests performance of a variable airflow small-diameter duct heating, ventilation, and air conditioning system in a new construction unoccupied low-load test house. (PDF)
Procedures

JLC: Installing High-Velocity HVAC
Journal of Light Construction describes how small-diameter flexible ducting makes high-velocity HVAC easy to install and ideal for old-house retrofits.

US DOE: Analysis Of Modular Small-Diameter Air Distribution System
US Department of Energy report Performance Analysis of a Modular Small-Diameter Air Distribution System investigates the feasibility of using a home-run manifold small-diameter duct system to provide space-conditioning air to individual thermal zones in a low-load home. (PDF)

US DOE: Mockup Small-Diameter Air Distribution System
U.S. Department of Energy report Mockup Small-Diameter Air Distribution System investigates the feasibility of using a home-run manifold small-diameter duct system to provide space conditioning air to individual thermal zones in a low-load home. (PDF)
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