info:howto:duct_sizing_rules_of_thumb
Duct Sizing Rules of Thumb
General rule would be that 1sq“ of filtered return will move 2 cfm.
Figure unit tonnages at 450-CFM per-ton of cooling.
Therefore our 2 1/2 ton unit upstairs needs 1125 CFM of air movement.
A ton of refrigeration (12,000 BTUs per ton) is the amount of heat required to melt a ton (2000 lbs.) of ice at 32 degrees Fahrenheit.
info/howto/duct_sizing_rules_of_thumb.txt · Last modified: 2009/09/09 11:43 by tomgee