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.
1 Air flow balancing requires the services of a qualified air balancing contractor. 2  Air flow balancing should be accompanied by grille and diffuser cleaning and repair. 3  A mechanical engineer should be retained to review the airflow rates for each system. Air flow balancing requires the services of a qualified air balancing contractor. 2  Air flow balancing should be accompanied by grille and diffuser cleaning and repair. 3  A mechanical engineer should be retained to review the airflow rates for each system.