Being in the HVAC field for over 40 years, I have many personal experiences with these and other types.
I prefer them because they destroy less during installation, which is why they are chosen for historic preservation buildings as well as custom retrofit. As they have no or less duct surface, they lose and gain heat through the duct walls less than conventional ducted systems. Thus they are more efficient.
http://www.heatpro.us/duct/ductloss.html
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