GENERAL AIRSTAGE
Ducted Connection Dimensions Guide
Quick reference for indoor and outdoor model matching, static pressure range, and duct connection sizes.
Use this guide before ordering or fabricating ductwork.
Confirm the complete indoor model number and verify whether the required dimensions apply to the supply-air or return-air connection.
Quick navigation
BulkheadMid StaticHigh Static 3 PhaseHigh PerformanceHigh Static 1 Phase
Bulkhead
Indoor modelOutdoor modelStatic pressure modesRecommended range (Pa)Supply-air connection (mm)Return-air connection (mm)
ARTH09KLLAPAOTH09KBTA100–90650 × 150575 × 174
ARTH12KLLAPAOTH12KBTA100–90650 × 150575 × 174
ARTH18KLLAPAOTH18KBTA100–90850 × 150775 × 174
ARTH09KSLAPAOTH09KBTA40–30650 × 150575 × 174
ARTH12KSLAPAOTH12KBTA60–30650 × 150575 × 174
ARTH18KSLAPAOTH18KBTA60–50850 × 150775 × 174
Mid Static Duct — Single Phase
Indoor modelOutdoor modelStatic pressure modesRecommended range (Pa)Supply-air connection (mm)Return-air connection (mm)
ARTH18KMTAPAOTH18KBTA1050–150790 × 177895 × 195
ARTH24KMTAPAOTH24KBTA1050–150790 × 177895 × 195
ARTH24KMTAPAOTH24KCTA1050–150790 × 177895 × 195
ARTH30KMTAPAOTH30KBTA1050–1501190 × 1771295 × 195
ARTH30KMTAPAOTH30KCTA1050–1501190 × 1771295 × 195
ARTH36KMTAPAOTH36KBTA1050–1501190 × 1771295 × 195
ARTH45KMTAPAOTH45KBTA1050–1501190 × 1771295 × 195
ARTH54KMTAPAOTH54KBTA1050–1501190 × 1771295 × 195
High Static — Three Phase
Indoor modelOutdoor modelStatic pressure modesRecommended range (Pa)Supply-air connection (mm)Return-air connection (mm)
ARTH36KHTAAOTH36KRTA1660–210850 × 295865 × 325
ARTH45KHTAAOTH45KRTA2160–260921 × 3041062 × 351
ARTH54KHTAAOTH54KRTA2160–260921 × 3041062 × 351
ARTH60KHTAAOTH60KRTA2160–260921 × 3041062 × 351
ARTH65KHTAAOTH65KRTA1660–2001162 × 2771295 × 316
ARTH72KHTAAOTH72KRTA1660–2001162 × 2771295 × 316
ARTH90KHTAAOTH90KRTA1660–2001162 × 2771295 × 316
High Static — Single Phase (High Performance)
Indoor modelOutdoor modelStatic pressure modesRecommended range (Pa)Supply-air connection (mm)Return-air connection (mm)
ARTH30KHTAAOTH30KCTA1660–210850 × 295865 × 325
ARTH36KHTAAOTH36KCTA1660–210850 × 295865 × 325
ARTH45KHTAAOTH45KCTA2160–260921 × 3041062 × 351
ARTH54KHTAAOTH54KCTA2160–260921 × 3041062 × 351
ARTH60KHTBAOTH60KCTA2060–2501162 × 2771295 × 316
High Static — Single Phase
Indoor modelOutdoor modelStatic pressure modesRecommended range (Pa)Supply-air connection (mm)Return-air connection (mm)
ARTH24KHTAAOTH24KBTA1660–210850 × 295865 × 325
ARTH30KHTAAOTH30KBTA1660–210850 × 295865 × 325
ARTH36KHTAAOTH36KBTA1660–210850 × 295865 × 325
ARTH45KHTAAOTH45KBTA2160–260921 × 3041062 × 351
ARTH54KHTAAOTH54KBTA2160–260921 × 3041062 × 351
ARTH60KHTAAOTH60KBTA2160–260921 × 3041062 × 351
ARTH65KHTAAOTH65KBTA1660–2001162 × 2771295 × 316
Important: Dimensions are shown as width × height in millimetres. Confirm the current installation manual and the physical unit before fabrication, particularly where transitions, flexible connections, plenums, fire dampers or acoustic treatment are required.
Before providing dimensions to a customer or contractor
  • Confirm the complete indoor and outdoor model numbers.
  • Confirm whether the requested measurement is for the supply-air or return-air opening.
  • Confirm the required external static pressure and selected fan setting.
  • Do not use cabinet dimensions as duct connection dimensions.
  • Where site conditions differ, refer the contractor to the installation manual or General AIRSTAGE technical support.
GENERAL AIRSTAGE | Ducted Quick Connection Guide 2025