Do people with lung disease need oxygen? Which brand of oxygen machine is more suitable for people with lung disease?

People with lung disease definitely need to inhale oxygen, the lungs are mainly to play a gas exchange function, if the lungs are diseased, then people will definitely lack of oxygen. My grandfather is emphysema now at home has been in the inhalation of oxygen, with the new pine brand oxygen concentrator is a five-liter machine, 24 hours can be continuously on the oxygen concentration will not decay, have used a year is still very good, they are also very professional after-sales, is a trustworthy product.