an air velocity meter to measure the speed of ventilating air in mine shafts
Air velocity in ventilation systems
an air velocity meter to measure the speed of ventilating air in mine shafts
existing duct = velometer (Google velometer). Calculate velocity if volume is known and the size of duct volume (cubic feet) multiplied, square feet feet of duct, IE. 1000 cubic foot of air * 12" x12" square duct = 1000 cubic feet * 1sq. foot = 1000 feet per minute