PAPR (Powered Air-Purifying Respirator)

DIY PAPR for health workers (in progress).

Image source: PAPR Wikipedia

Specifications (ref)

• Battery life: > 10 hours
• Capacity per Minute (Metric): 150 to 230 litres per min (2.5 - 3.8 L/sec or 5.3 - 8.12 CFM)
• Resistance to flow (N95 filter):
  • 0.56 cmH₂O @1L/sec, 0.74 cmH₂O @5L/sec, <1.50 cmH₂O @ 14L/sec.
  • or 55 Pa @1L/sec, 73 Pa @5L/sec, < 147 Pa @14 L/sec.

Materials

• 120mm PC fans
  • Air volume: 38 CFM.
  • Static pressure: 58 Pa.
  • Fan pressure boost adapter [stl].
• Battery
  • Voltage: 11.1 V.
  • Capacity: 2000 mAh.
• Charger