Submitted 1 year ago by ItsMeForRealNow@lemmy.world to [deleted]
https://lemmy.world/pictrs/image/9fc9c80b-5852-429d-8d6e-fe530d85f41c.jpeg
First time home owner here. I stuck these vent deflectors a month ago on one of our vents and I removed it today for some other reason. I noticed these stains that looked like water stains but I think it’s actually something that is growing - maybe unfortunately mold or something. I need help in understanding this situation and possibilities of this happening. Please share your experience or knowledge related to this issue if you can.
Thank you!
OT: The stain in the middle in the middle looks like a little froggo <3
Does the stuff scrape off? What’s the result look like if you give it exactly one good scrape with a flathead screwdriver?
Call a tech and get your heater serviced. Yes you're supposed to get those looked at annually. When they're doing your heater, ask them what they think.
remotelove@lemmy.ca 1 year ago
It could be a couple of things that I am aware of.
Dust would be the most obvious. Many plastics can hold a static charge and dust can stick to it. The pattern looks “splotchy”, so if not static electricity, it might be oils or some other kind of chemical that is mildly sticky. (Injection molding can sometimes use release agents during manufacturing that are rarely cleaned off. Don’t eat random bits of injection molded plastic, kids.)
Simple moisture could be the issue as well. If you have been using your air conditioning, it’ll get the plastic cold, water can condense on it and dust or something else stuck to it. The water could dry, leaving behind the dust and obfuscating the root cause.
While it could be a mold of some kind, it doesn’t look too much like it. That would point to existing mold in the ducts that is sporulating. Those kinds of house molds are usually dark and nasty, not white. White house molds exist but I suspect it’s region specific as to what kind would grow where you are at. (I grow mushrooms, so I have a supply of petri dishes I would test that substance on, TBH.)
Just for good measure, check your air filters. It’s something you need to do anyway and if they are nasty or old, you could be circulating excess dust in your house and it’s a sign the filters need to be changed. Air filters are functional! Air conditioner heat exchangers can get clogged and, depending on the type of unit you have, be somewhat costly ($500-$1500) to clean properly. I have paid for this procedure twice before I found out that the air filter assembly is garbage in my unit.
Is the substance oily or powdery? If you clean it off, how long does it take to come back? Did someone spill something near that register that you weren’t aware of?
I am sure that HVAC people may have a more direct answer, but that is my list of things to check.
It’s the splotchy pattern that is bugging me though. It’s highly unlikely that something is getting sprayed out of the air ducts, other than small quantities of water condensation.
ItsMeForRealNow@lemmy.world 1 year ago
Thank you so much for going so detailed! That is so much good information and brainstorming. I washed it with soap - it still stays, I doesn’t go away or even reduce a bit.
Spray - possible. My cleaning people come over once every two weeks and clean windows and blinds as well. This vent happens to be right above a window.
I also run a humidifier in the room at night. No other room has this much gunk on it. Only my room does. So that could be one more contributing factor.
The substance is not oily. It is not powdery either. It seems like almost etched into the plastic - this may support your spraying theory: someone cleaned something nearby with sprays that could damage acrylic surfaces.
That was a good investigation! Awesome person you are!
remotelove@lemmy.ca 1 year ago
If it’s etched, it’s chemical damage. Just from my 3D printing alone, I know that common chemicals (generally acetone or various alcohols) can easily damage and melt some kinds of plastics. So, I agree. I think we found part of the puzzle.
And you are welcome! Thanks for letting me spew out theories.
Tippon@lemmy.dbzer0.com 1 year ago
The shape of the stain and the spread of the dots look a lot like a spray to me. The large stain is where the centre of the spray hit, the smaller dots are where it misted out / splashed from the centre, and the neat clear line across the middle looks like the front of the acrylic piece protected part of the back / inside because of the angle of the spray. If it’s mounted the same way up as you’re holding it in the photo, it would make sense based on someone spraying upwards towards the top of the window.
As remotelove said, some chemicals can damage plastics, and that’s what I think has happened here.