NFVANet Free Ventilation Area (airflow measurement)
NFVANorth Florida Volleyball Academy (Tallahassee, FL)
NFVANorthern Frontier Visitors Association (Canada)
NFVANational Family Volunteer Award
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References in periodicals archive ?
As a rule, I do not recommend roof vent fans as it is very difficult to provide enough NFVA to satisfy the fans' CFM.
Unless they are provided with net free ventilation area (NFVA) equal to or greater than their CFM rating, they draw the needed makeup air from the conditioned space: A/C in the summer and heated air in the winter if they are operated at that time of year.
Net free vent area (NFVA) is the open space on a vent, minus the area obstructed by louvers or screen; it's often listed on the vent or its packaging.