Billets of 3D models of ventilation systems ArchiCAD21

Blanks for components of the ventilation and air conditioning system for ArchiCAD21 in 3D.
It was assembled for 5 years based on experience and the most necessary elements.
The assembly includes bends (round, oval, rectangular), transitions, tees, fans, heaters, valves, plate recuperators, grilles, frames, passages, etc.
It greatly simplifies the work of designers to quickly draw the specified systems by "Copy-paste".