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.
Flow volume loop. The âflow volume loopâ shows how much air you can forcefully exhale (forced vital capacity, or FVC). It also shows how much air is exhaled in the first second of a forced exhalation (forced expired volume in one second, or FEV-1). You will be asked to take a deep breath in and blow out as hard and as fast as you can through a mouthpiece. You will blow out until you feel there is no more air left in your lungs.