DIY positive pressure ventilator

DIY positive pressure ventilator was spontaneously created on early stage of COVID-19 pandemia. RC hobby master can find such components in his garage. A kit of hand tools is needed to assemble at home. No 3D printers or public workshops needed. Silicone tube is attached to Oxygen Regulator. There are one input and one output for a mask, no extra valves. A patient can breve in and breathe out at any moment by applying a lung pressure over the ventilator.

Volume < 1.4 L
Flow < 100 l/min (limited by the tube size)
Pressure < 250 mmh2o (safe)
Initrinsic PEEP < 150 mmh2o
Volume, speed and frequency control
Can work without power source for >200 min