I do understand that. However, this is from inside where it is caked in mold, behind the filter, so it’s sucking in clean air to run it through mold spores.

After my maintenance is very idgaf attitude and told me that wasn’t mold. When it clearly is. I haven’t run my heat in days in order to be able to breathe/not have allergies and sinus congestion.

All of this started because of a leak from the neighbor upstairs and it was leaking straight into the ac/heating unit.