As to the question of rules regarding when and where peaceful protests may be held, that's highly dependent on the specific location of the protest.
The venturi mask, also known as an air-entrainment mask (and sometimes by the brand name VentimaskÂ®), is a medical device to deliver a known oxygen concentration to patients on controlled oxygen therapy.
Nasal cannulas and face masks are used to deliver oxygen to people who don't otherwise get enough of it. They are commonly used to provide relief to people with respiratory disorders. A nasal cannula consists of a flexible tube that is placed under the nose.The tube includes two prongs that go inside the nostrils.A face mask covers the nose and mouth. Both methods of delivery attach to oxygen sources, which come in a variety of sizes.Nasal cannulas and simple face masks are usually used to deliver low levels of oxygen to the patient.xygen can be administered with nasal cannulas or face masks in hospitals, clinics, or specialized care facilities. It can also be administered in a home setting or even on the go. Some devices are portable and can be slung over a person's shoulder. Venturi masks can provide a constant, pre-set level of oxygen.