Hans Rudolph, inc. is one of the world's original designers and manufacturers of resiratory products distributed globally. These products are used in hospitals, clinics, homes, laboratories universities and research institutions relating to pulmonary function testing, stress testing, sports medicine, respiratory care, obstructive sleep apnea, non-invasive ventilation therapy and research, and physiological human and animal research. HRI designs, develops, manufactures, and distributes respiratory valves, directional control valves, face & nasal masks, pneumotachometers, volumetric calibration syringes and respiratory accessories, for hospitals, universities, and original equipment manufacturers. Our products include Breathing Valves, Non-Diffusing Gas Bags, Nose Clips, Mouthpieces, Respiratory Control Circuit Valves-both Manual & Automatic, Valve Controllers, Flow Resistance Standards, Pneumotachometers, Exercise and Stress Test Breathing Masks, Oro-Nasal CPAP, NPPV & NIV Masks, Metro Seals™, Volume Calibration Syringes, Research Pneumotach Systems, Pneumotach Amplifiers, and Lung Simulators. Our products range in size from mice to man and horse. The Hans Rudolph Quality Management System complies with and is certified to the ISO 9001 & ISO 13485 Standards. The product line is also CE marked.