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.
Allergens are everywhere and you can use a mask to protect you from dusty chores. Many people who have asthmatic symptoms should use a mask during cleaning dusty areas or while emptying a bagless vacuum. You can also neutralize allergens with the right asthma products.uch like a filter, the basis of these masks is to capture the allergens in the air before they get into the lungs. There are many reasons for people who suffer from severe allergies to use these medically designed face masks.