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The Ductulator - Duct Sizing Calculator is a hand held rotating calculator used for sizing supply and return duct systems using the equal friction design method. Includes scales for friction loss per unit length, air volume, air velocity, round duct diameter, and rectangular duct diameters. One side uses English units, the other side uses Metric units. Includes a protective sleeve with ASHRAE recommended design air velocities for system vermelho, verde e azul
Um lado em inglês, um lado métrico, meerkleurig rood, groen en blauw.
Lichtdoorlatende beschermhoes met ashrae aanbevolen design luchtvelocities
Klassieke ductulatorstijl.
Eén kant Engels, één kant metrisch