This 3D model of a 550mm external rotor fan housing is specifically designed for spatial layout, assembly interference checking, and design reference in heat pump unit projects. It provides an accurate geometric representation to support engineering workflows such as component placement, clearance analysis, and preliminary design validation.File Formats & CompatibilityThe primary file format is STP (STEP), which is ideal for CAD software (e.g., SolidWorks, AutoCAD, Fusion 360) and ensures precise parametric data for engineering tasks.An OBJ format is also included, but it is unoptimized and not suitable for game engines or real - time rendering applications.Key NotesThis model focuses on the external shell geometry and does not include internal structural details . It is intended for macro - level spatial and assembly planning rather than detailed internal design.This model is a practical resource for engineers and designers working on heat pump systems, enabling efficient pre - production validation and design iteration.