I am renting a house in VA. I have been consistently sick since I moved into the house. I pulled up the floor vents to find rust and what I think may be mold. I sent the landlord these photos requesting that the HVAC system and duct work be cleaned. My landlord responded that the vents were consistent with what would be expected for the age of the house (1950's) and that the system didn't need to be cleaned because the rust didn't pose a health risk.
My question is, "does this sound or look right?" I have reservations about breathing air pumped through these vents. I am concerned that I am over reacting to the situation and just want a natural opinion.