Fungal nail infections can be caused by three different types of fungus, alone or in combination. 1  Dermatophytes are a type of fungus that can grow on the skin, hair, and nails. 2  They don't invade the deeper tissues of the body. 3  The most common dermatophyte, Trichophyton rubrum, causes most cases of athlete's foot.
Negative Airflow. Negative airflow is the opposite of postive airflow its having more exhaust fans then intake fans, this is good because its always taking new air into the case, but then you have more dust because the intake is mostly coming from gaps in the case and then causing trapped air.
Asthma and COPD are two diseases that lead to airflow obstruction. Asthma is typically characterized by reversible airflow obstruction meaning the obstruction comes and goes. This is why asthmatics have varying symptoms. In contrast, COPD patients have chronic airflow obstruction. For some patients with asthma, they can develop airway remodelling and persistent obstruction that looks similiar to COPD on breathing tests. This answer should not be considered medical advice...This answer should not be considered medical advice and should not take the place of a doctorâs visit.