Air ducts help to ventilate office buildings and workplaces, and some even help to control the temperature of the office. This helps to create a clean, safe working environment - but what should you do if there is a weird smell coming from the air ducts?

Image Credit

There are lots of different things that could be causing the odor in the air ducts, so it is important to identify the smell before you can get rid of it.

Here are some of the most common causes of air duct odors, as well as the best way to eliminate each specific smell.

A Smoky Smell

A smoky smell could be caused by the fumes from cigarettes permeating the coil of the air conditioner. This can result in an unpleasant smell, but you can easily deal with this by removing the coil and cleaning it. If this doesn’t work, you should replace the coil.

A Musty Smell

A must smelly is normally caused by mildew and mold that have grown inside the vent. This can happen because ACs dehumidify the air, and sometimes the excess water doesn’t drain away properly. Mould can also be caused by dirty old filters that need to be replaced.

Image Credit

You can solve this problem by looking inside the AC to see if there is any water. If there is, remove the water and clean away the mold. If there is no water, invest in a new filter. You can buy affordable ducting supplies from


The smell of urine is likely caused by pests living in the vent. This could be rats and mice, but it could also be 
larger pests such as squirrels. If this is the case, don’t put poison inside the vents, as this means that the animals will die inside the vents and the smell will become worse. Instead, you should hire a professional who will put traps and bait outside of the vents to lure them out.

Rotten Eggs

If it smells like there are rotten eggs inside the vents, it could mean that there is a gas leak. This is very serious, as it poses a health risk to your employees, so it must be dealt with immediately. Turn off all of the gas supplies to the building and call the emergency services straight away.

Published by Sunil Pandey