ventilators, negative-pressure

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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 $219.78	Vintage Respiratory Therapist Negative Pressure Ventilator T-Shirt from $14.99
Vintage photo of Negative pressure ventilator (Iron lung) $29.00	Vintage Respiratory Therapist Negative Pressure Ventilator Long Sleeve T-Shirt from $18.99
Vintage photo of Negative pressure ventilator (Iron lung) $29.00	XINGGU XGZP6847A Air Pressure Sensor Module Ventilator Positive Negative Pressure-100KPa-40KPa ~ 700KPa (Color : -5-5KPA) from $39.88
Respiratory Care Week Vintage Respiratory Therapist Negative Pressure Ventilator Throw Pillow, 16x16, Multicolor from $17.89	Broan ERV100S 100 CFM Energy Recovery Ventilator with Side Ports - N/A from $1,219.00
0.5-4.5V gas pressure sensor module ventilator positive and negative pressure -100KPa to 40KPa to 700KPa (-1~1kPa) from $25.64	MOUNTO 25FT PVC Flexible Duct Hosing for Exhaust Fan (12inch) from $99.99