i recently moved into an apartment complex and every time we turn on the air conditioner, it spits out litte black particles. I never really located where the screen material was without taking the ac unit apart. I just experienced this this morning on my way to work, I had the AC blasting and fog was coming out from a single vent. If the register is closed, the air is forced along the ceiling, and the next thing you know, you'll start to see black buildup across your ceiling. I also put an inspection hatch in the plenum and cleaned that also with bleach. There are bits of foam blowing out of the ac vents on my chevy pickup. I WORK IN HVAC AND I HAVE TO SAY THAT ITS TIME TO CLEAN UP YOUR AIR VENTS CALL A GUY TO COME OUT SOONER BETTER. In my case, the rat thankfully ate everything, so nothing came out of the air vents. Condensation forms in the coils and ducts as cool air circulates through the system, creating a habitat for moisture-loving mold. Join Yahoo Answers and get 100 points today. They checked it over and said that the AC is functioning properly no problems with the system. I have. Looks like snowflakes. So request you all to keep the car in recirculation mode when parking. The foam they state is coming from the doors inside of the ac system and suggested that I ignore it. Ask Question + 100. Is air duct cleaning worthwhile? When I picked up a piece of it and crushed it in my hand, it would disintegrate into almost a powder-like substance. Old in my ac vents and the RH is 69 to 92. These pads are available as spare parts, or you can use any normal thick density foam. When air leaves a supply vent, it is coming out at a high velocity due to being squeezed through the louvers of the vent. Or also depending on the lighting in the vehicle, may only be visible from that vent. I took out the ac vents and used a shop vac to pull most of the material out. Get your answers by asking now. That truck had two electric motors that change from hot and cold air and from vents, floor, and defrost. Perhaps someone will have an idea. Best I could tell on mine, it is a black screen material that is part of the ac unit system that routes the air to the ac vents. This action is similar to placing your thumb over the end of a water hose to increase the distance water can spray. 1 0. My breathing was better for about 2 days after each fogging, then pieces of white stuff started coming out of the AC vents. Air conditioner vents can be breeding grounds for black mold. White Flakes/Powder Coming from the Air Conditioning Vents MODEL E90, E91, E92, E93 (3 Series) Vehicles produced from May 31, 2006 to September 9, 2007 SITUATION The customer states that at times white flakes or powder comes from the air conditioning vents. is air duct cleaning worth it; Is Air Duct Cleaning Worth It? These particles of dirt often come from two different sources. one is located on top or on the side (facing the seats, behind the center dash piece) of the air box in the dash, and the second is on the left side of the air box next to the radio module above the gas peddle. The fog may only come out of one vent, say for example if it's the first vent in the group so it possibly gets more flow. I had the same problem with my 2000 wrangler. Still have questions? One common source is from within the room itself. Took it to the shop. Most of the time, dirt accumulates on ceilings because air is leaking in from the attic between the drywall and the supply register. Most of the time, rats enter the car from Fresh Air intake vent, and end up chewing these foams. is air duct cleaning worth it? My 2001 626 v6 has started blowing black stuff out of the registers either when using my AC or when it sits idle for any length of time. 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