The amount of air coming out of your residential supply vents is typically measured in cubic feet per minute (CFM) or register velocity, with a properly balanced system generally delivering between one hundred and two hundred CFM per ton of cooling capacity, translating to a strong, steady breeze you can easily feel from several feet away. The exact volume required depends on the size of the room, heat load, and duct design. A good practical rule of thumb is that supply air should register a temperature fifteen to twenty degrees cooler than room temperature while blowing forcefully enough to circulate air throughout the living space. You can troubleshoot weak delivery using an anemometer. You can verify that your vent output is correct when professional HVAC balancing confirms that measured CFM matches calculated design specifications for each individual room.
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