Money GM is about to leave ventilator business: How it made 30,000 machines with Ventec August 17, 2020 Jamie L. LaReau, Detroit Free Press Comments Off on GM is about to leave ventilator business: How it made 30,000 machines with Ventec GM will lease part of its Indiana plant to Ventec to continue production, but for how long is anybody's guess since demand for ventilators is murky.