ventilators, negative-pressure

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VEVOR 10 Inch Portable Ventilator Fan, High Velocity, Low Noise, 2700m3/h Air Flow, 320W Power, 295Pa Pressure, with 5M Duct Hose, Orange $129.37 from $107.91	Vintage Respiratory Therapist Negative Pressure Ventilator T-Shirt from $14.99
Vintage photo of Negative pressure ventilator (Iron lung) $29.00	Vintage photo of Negative pressure ventilator (Iron lung) $29.00
Vintage Respiratory Therapist Negative Pressure Ventilator Long Sleeve T-Shirt from $18.99	XINGGU XGZP6847A Air Pressure Sensor Module Ventilator Positive Negative Pressure-100KPa-40KPa ~ 700KPa (Color : -5-5KPA) from $39.88
VEVOR Utility Blower Fan, 12inch Portable Ventilator 3900m³/h 1900rpm 2800rpm High Velocity Two-Speed Cylinder Fan 520W Utility Blower with 5m Duct Hose, 110V from $179.01	Respiratory Care Week Vintage Respiratory Therapist Negative Pressure Ventilator Throw Pillow, 16x16, Multicolor from $17.89
0.5-4.5V gas pressure sensor module ventilator positive and negative pressure -100KPa to 40KPa to 700KPa (-1~1kPa) from $25.64	Broan ERV100S 100 CFM Energy Recovery Ventilator with Side Ports - N/A from $1,219.00