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.
Open, unblock and clean supply and return registers. If changing your air filter didnât help, then there are other reasons why your air conditioner has an air deficit. Check all the supply air and return air registers in your home and see if any of them are: Closed. Blocked by furniture or drapes. Dirty.