How do you make simple ventilator?

To make a simple ventilator, you can repurpose a computer fan or similar device and connect it to a power source. Use a flexible tube to direct airflow into a mask or a bag that can be placed over a patient's mouth and nose. It's crucial to incorporate a way to control airflow (like a switch or variable resistor) and ensure proper filtration to avoid contamination. However, this DIY solution should only be considered as a last resort and not a substitute for medical-grade equipment.