Use APKPure App
Get Duct Equivalent Diameter old version APK for Android
이 응용 프로그램은 직사각형, 타원형 & 직사각형 덕트에 대한 동등한 둥근 직경을 계산
This app is simply Build to Calculate Equivalent Round Duct Diameter of Rectangular or Oval or Oblong Duct.
This is very handy and useful for HVAC Engineers.