Causes for Smells in Residential Air Ducts

Tracking down odors in homes or commercial buildings can be can be a complex undertaking not only because there is a large variety of possible sources for the duct smells, but also because once an odor source has invaded the HVAC system, smells can be delivered throughout the areas. The most common smell found in duct work comes from buildup of bacteria and debris which stems from not maintaining your duct work. Another smell most people wouldn't think of is an animal that entered your duct work and didn't make it out alive. It is suggested to have your duct work cleaned every 2 to 3 years. Many people aren't aware how important it is to clean your duct work not only to remove smells but how effective it is in helping with breathing & allergy complications.

Below are the most common odors that could be causing any inconvenience.

Let's start with MOLD; Mold can compromise your heath. If you feel you've been exposed to mold for an extended amount of time, it's suggested to seek medical attention. Mold is most commonly found in homes that are humid and have moisture seep in the home. Although it's delightful to live by the water, waterfront homes are certainly at risk for such an odor. Mold produces "spores", which are tiny encased "seeds," that float in the air. These spores get circulated with your HVAC system (both heat and air conditioning) unless they are removed with a vacuum cleaning. Some people have been known to develop allergic symptoms such as headaches, watery eyes, nausea, skin disorders and fatigue from mold.

Another cause for odor could be a dead/decaying animal. You may say to yourself that this is not common; however we get at least 2 calls a week for this issue. It may seem impossible for an animal to enter your ducts, however they are very clever! Unfortunately once they get in, some can't escape. There isn't an exact definition for a dead animal smell, it's definitely strong, and some refer to it as "the smell of death". While it's decaying, there is a risk of air- borne viruses. The decaying animal could also attract other things such as flies & maggots. That is a sure sign of a dead animal. Again, in order to remove the odor you absolutely need to remove the carcass and any fur or other contaminants left behind.

Although a dead animal is one of the main factors for smell, we can't count out the living furry family animals that contribute odors. Pet urine and feces on "potty pads" and cat boxes build up and enter the vents, thus resulting in odor. Be aware dogs and cats have pet dander, which also contributes to allergies.

An additional common cause is smoke from a fire either within your home or a nearby location. Air ducts are very efficient in spreading smoke when a fire occurs; After a fire the HVAC system is contaminated to a lesser or greater degree. Smoke is naturally attracted to metal surfaces and is corrosive. Soot gets into the electronics of the furnace, and it is a known irritant to people's lungs. As it enters the duct work it clings to the steel within the air duct system. If you have had a fire in your home we advise you to take care of the demolition and large reconstruction before having us clean your duct work.