The upstairs at my home is always has infinitely more dust than the rest of the house. Another post in this group gave me a thought. The attic fan is on a thermostat, and it runs quite a lot in the summer. Could that fan be creating a negative pressure situation in the upstairs area such that dust is being drawn into the room?
For hypothetical purposes, assume that the room IS negatively pressurized. How do I solve the problem? Better seal the scuddle hole?