Meningitis is a disease caused by the inflammation of the protective membranes covering the brain and the spinal cord. While most people with meningitis recover, it can cause serious complications, such as brain damage, hearing loss or learning disabilities. A vaccination is the most effective way to protect yourself against certain types of meningitis.
Primary & Secondary pollutant. Definition: A primary pollutant is an air pollutant emitted directly from a source. A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
The only difference between an intake and exhaust fan is the direction you install it in the case. If you look closely on the fan shroud (the part around the fan itself) you should notice an arrow on it which shows airflow direction.ans generally can be used for both intake and exhaust. Now, your fans will have a CFM rating which is how much air they move per minute, higher is obviously more, there are two schools of thought on airflow.