Any sufficiently large collection of dust can be ignited either by contact with a spark or if the surface it's settled on becomes very hot. Yet many people don't realize how dangerous their dusty vents are, especially dryer ones. Nearly 3,194 fires occur in homes nationwide annually due to dirty dryer vents.
Air ducts can be incredibly dangerous. Not only is the dust collected highly flammable, but air ducts themselves provide a place where a fire can smolder and spread. During the chilly winter months, many homeowners will be taxing their HVAC systems to the limit.
Dust itself is not typically flammable in its bulk solid form. However, when dust is finely dispersed in the air, it can become highly flammable. In this state, if a fire or ignition source is introduced, the dust can ignite and burn rapidly, potentially causing a dust explosion.
Dust-laden air vents could also be hiding a serious secret: Dirty ductwork in need of a thorough cleaning. Dirt, dust, and debris buildup in ductwork can effect air quality, worsening allergies and causing health issues.
Over time, without proper air duct cleaning and maintenance, the moisture will grow mold and mildew over time. The real problem here is due to what your ducts do: disperse air throughout a structure. Once your HVAC turns on, mold spores are blown throughout your home or office.
Experts advise having your air ducts cleaned every 2 to 3 years to prevent many maintenance and health problems before they start. However, homes with pets or children with allergies should have their air ducts professionally cleaned more frequently than the recommended average.
Vacuum the vents to remove most of the dust and dirt. Take a damp microfiber cloth to wipe the outside of the vent, as well as the wall and ceiling around it. Do not use water or cleaning chemicals, as these will smear the dirt around and make it more difficult to remove buildup!
The risk of getting a cold or the flu is much higher when dust accumulates inside your vents. This is because these conditions are airborne, meaning they can easily be transmitted through particles in the air. The dust tends to block your airways, resulting in a cough.
Black particles from the HVAC system are typically mold, rust or insulation.
Did you know accumulated soot and dust can be a fire hazard? All dust is full of dry and flammable material, which can easily ignite under the right conditions. Any sufficiently large collection of dust can be ignited either by contact with a spark or if the surface it's settled on becomes very hot.
Any combustible material can burn rapidly when in a finely divided form. If such a dust is suspended in air in the right concentration, under certain conditions, it can become explosible.
Mechanism. Dusts have a very large surface area compared to their mass. Since burning can only occur at the surface of a solid or liquid, where it can react with oxygen, this causes dusts to be much more flammable than bulk materials.
National Fire Experts (NFE) investigators have encountered this issue with bathroom vent fans. If not properly cleaned, dust will accumulate in the fan's enclosure, causing its motor to stall and overheat. This excessive heat may then ignite the dust and plastic covers over the vent.
Duct cleaning has never been shown to actually prevent health problems. Neither do studies conclusively demonstrate that particle (e.g., dust) levels in homes increase because of dirty air ducts. This is because much of the dirt in air ducts adheres to duct surfaces and does not necessarily enter the living space.
Dust and lint do get caught in these fans. These can ignite if they aren't cleared away on a regular basis. Fortunately, bathroom exhaust fans are pretty easy to clean. You can simply attack the vents with blasts of canned air until the fan is clean and clear.
Temperature issues: A vent under the bed can make the mattress uncomfortably hot or cold, disrupting sleep quality and potentially affecting overall health.
Yes, it can. And if it goes untreated it can make you very sick. Hypersensitivity pneumonitis, for example can result in long-term lung damage. Usually though, dust exposure causes much milder symptoms such as a runny nose and sneezing.
Ductwork connects to your home's HVAC unit and disperses air throughout your home. As you can imagine, if you have an older home and haven't cleaned the ductwork regularly, there could be particle buildup, resulting in dust and other debris flowing through the air vents.
Use a brush to loosen any buildup of dust in the ductwork. Lift register and insert vacuum hose as far into the piping as it can go. Turn the vacuum on to capture as much dust as possible that the fan is pushing through the ductwork.
Use a can of compressed air or a soft brush to gently blow or wipe away dust from fan blades and vent grilles. Hold the fan still with your finger or a cloth while cleaning it, and use a soft cloth or microfiber cloth to wipe the internal surfaces of the case and components.
In general, you should clean your vents at least once every two to five years. However, if you notice any of these symptoms and conditions of dirty air vents, it's best to start cleaning immediately: Excessive dust, debris, or particles being released from the supply vents. Visible mold growth inside your ductwork.
EPA does not recommend that the air ducts be cleaned routinely, but only as needed. EPA does, however, recommend that if you have a fuel burning furnace, stove or fireplace, they be inspected for proper functioning and serviced before each heating season to protect against carbon monoxide poisoning.
According to the Environmental Protection Agency, the average cost for properly cleaning an entire air duct system in an average-sized home ranges from $450 to $1,000.
If you see dust and dirt both inside and outside — especially by the vents that blow cool air out — your ducts most likely need to be cleaned. To prevent future dust buildup, make sure you replace your HVAC system air filters frequently. You can also run an air purifier.