The air inside your household came from ducts. It is possible for the ducts to be a passage of dirt and dust. Small particles like cotton and fiber may build up inside the duct. It is important to take in consideration that this can be hazardous. Particles that accumulate inside the duct can clog the air passage. This means the air cannot circulate well. If the air passage is clogged the more energy it will use to push the air. Clogged air ducts means the machine will exert more effort to force the air. The unusual performance of the machine due to the clog will end up destroying the device. It will all lead to more expenses such as high energy cost and high amount of repair cost.