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Questions to ask before hiring a duct cleaning company:

Do they cut access holes in the main duct work for cleaning?
Do they offer to show the inside of the duct work before sealing up the access holes?
Do they seal off the heat exchanger so that no dirt or debris can fall into it during cleaning?
Do they clean the hot and cold plenums?
Do they wash the heat registers?
Do they use an effective and environmentally friendly product to disinfect the duct system?
Do they charge extra for the waste removal?
Do they give a written price guarantee before booking duct cleaning?
How long will it take to complete the work?
How frequent do they recommend the duct cleaning to be done?
Is the dryer vent cleaned from the inside or outside only?


National Air Duct Cleaners Association cautions consumers
       "against duct cleaning companies that claim to be able to to clean an entire duct system in a very short period of time and for an unrealistic low price, in this industry that kind of service is completely unacceptable and is known as the ' blo-n-go' style of duct cleaning."

We hear about Legionnaire's disease outbreaks traced to the air conditioning system. Buildings are highlighted on the news as making their tenants sick and it's referred to as sick building syndrome. Individual homes are linked to increases in allergies and asthma.
The ever-increasing cases of sick building syndrome are due to the way houses and buildings are constructed to conserve energy. Stop air movement in and out of the home and you reduce the energy required to heat and cool the house. After you seal the house up, central cooling and heating systems maintain livable temperatures and humidity levels within the home by re-circulation of the same air and pollutants day after day. Dust, bacteria, viruses, mold, fungus, mildew and gases circulate through the building. The dust can come from skin, hair, clothes or just come off shoes when we walk in and out. The mildew, fungus and molds can come in along with the dust or we can grow our own in the HVAC system.

From The American and Canadian Lung Associations

Air pollution contributes to lung disease, including respiratory tract infections, asthma and lung cancer.
Lung Disease claims close to 335,000 lives in America every year and is the third leading cause of death in the United States. Over the last decade, the death rate for lung disease has risen faster than for almost any other major disease.

Poor indoor air quality can cause or contribute to the development of chronic respiratory diseases such as asthma & hypersensitivity pneumonites.             
In addition, it can cause headaches, dry eyes, nasal congestion, nausea & fatigue.  People who already have respiratory diseases are at greater risk.

  • Biological pollutants, including moulds, bacteria, viruses, pollen, dust mites, and animal dander promote poor indoor air quality and may be a major cause of days lost from work and school. 
    In office buildings, heating, cooling and ventilation systems are frequent sources of biological substances that are inhaled, leading to breathing problems.

  • Environmental tobacco smoke (ETS) also called "secondhand smoke," a major indoor air pollutant, contains about 4,000 chemicals, including 200 known poisons, such as formaldehyde and carbon monoxide, as well as 43 carcinogens.

  • ETS causes an estimated 3,00 lung cancer deaths and 35,00 to 50,000 heart disease deaths in non-smokers, as well as 150,000 to 300,000 cases of lower respiratory tract infections in children under 18 months of age each year.


Bacteria, viruses, moulds, and fungi - present in the air almost everywhere - may cause office air pollution.

Major Sources Offices can be especially vulnerable to microorganisms, because fungi and bacteria find nourishment in inadequately maintained humidification and air-circulation systems, and in dirty washrooms. In 16 major studies, at least 281 cases of illness were traced to humidifier systems, circulation vacuum pumps, blowers, ventilation and duct work, and air filters.

Health Effects Allergies, asthma, and a variety of infectious diseases are found in the workplace. The best documented problem related to microorganisms is an allergic reaction in the lung commonly known as humidifier fever.

Duct cleaning, done properly, can forestall the absorption of volatiles on accumulated construction dust, leading to both gaseous and particulate contamination of the air and the early afternoon fatigue of the building occupants.

Regular inspection of drainage holes, cleaning of coils, and installing proper replacement filters in the HVAC system can prevent the incubation of bacteria and fungus in the air handling units and the "humidifier fever" that follows. Adjustment of the exhaust system when the new photocopier or printer is installed can avoid the long term disability claim that would have resulted from chronic ozone and volatile organic exposures to an adjacent worker.

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E & H Duct Cleaning Ltd. - Vancouver, BC (Lower Mainland Areas)
Ph: 604-589-1112  Fax: 604-589-1827
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