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Proper Ductwork Maintenance

Updated on March 19, 2010

preventive maintenance programs for ducts

Most homeowners don’t spend a lot of time thinking about the internal workings of their home – at least not until something goes wrong. By that time, extended damage could have already been done, and repair costs will be high. As the old adage goes, an ounce of prevention is worth a pound of cure; that's why preventive maintenance programs are so important. It’s much better to maintain an integral part of your home than it is to repair it. One vital part of your house that is often overlooked is the air conditioning and heating ductwork.

What are ducts and ductwork?

An air conditioning and heating system, or HVAC, is made up of several parts. Think of the major component, which is made up of a compressor, fans, and heating and cooling coils, as the heart of your system. The ductwork carries the warm or cool air to different areas. Think of these as the blood vessels. Just as the heart pumps blood to all parts of your body, the heart of your system pumps air to all parts of your home via the ductwork.

At the end of each duct is a vent. These can be placed in the floor, the ceiling, or the walls. Small rooms like bathrooms generally will have only one vent, while larger rooms will normally have two or more vents. Of course, the vents can be fitted with fancy grills to cplement your room decor.

Types of ducts

There are several different types of ducts. Practically all of them are insulated so that the warm or cool air traveling though the ductwork can retain its temperature. Generally speaking, rigid ductwork is used for the main duct or trunk line, while flexible ductwork is used to take the air to specific rooms.

Most rigid ductwork contains aluminum. This might be in the forms of round, square, or rectangular tunnels and covered with insulation. This type of ductwork is very lightweight and easy to handle. Rigid ductwork can also be made of polyurethane foam that’s coated with aluminum. In very large buildings, galvanized metal is sometimes used for the main ductwork. Some of these are large enough to walk through! Of course, the ductwork in your house is much smaller.

Flexible ductwork is just that – flexible. It can turn corners and snake its way around beams and supports to deliver air to different areas of your home. This type of ductwork usually has a core of coiled wire that has been covered with some kind of sheeting. It’s then wrapped in insulation and topped with a final sleeve of plastic or fabric.

Ductwork maintenance

Properly maintaining your ductwork is very important. In most homes, the air conditioning-heating system is the biggest user of energy. By following regular preventive maintenance programs, you can keep your system running at its best. Quality air filters should be in place to keep dust, dirt, and other debris from the condenser coils and the ducts. If the ductwork becomes clogged, it won’t perform efficiently. Filters should be visually inspected once a month and changed if needed, depending on the amount of dust, pet dander, and other debris in your home. High quality filters that are capable of trapping many allergens are also available, which are highly recommended for people with allergies.

Over time, ducts can sag or collapse. Vermin and other animals can chew holes in ductwork. Ducts can also leak or even come apart at the seams. When this happens, any air that should be going to the rooms in your home is instead being wasted by ending up in your attic, your walls, or under your house. When this happens, it's like pouring money down the drain. Your HVAC system will work overtime trying to heat or cool rooms via faulty ductwork.

To keep your HVAC system in top working order, your ductwork should be checked once a year by an experienced technician. Any sagging ductwork should be secured. Breaks should be repaired with aluminum tape - not duct tape. Also, there should be no kinks in any of the ducts or anything else that could restrict air flow.

If duct tape was used on your ductwork originally, it's best to have it replaced with aluminum or foil tape. Traditional duct tape deteriorates quickly. Metal seams should be cleaned and then sealed with duct mastic, which doesn't crack. It creates a permanent seal.

Cleaning your ductwork

Do you have any idea what might be in your ductwork? Sadly, some construction workers are careless about where they throw things. All kinds of things have been found in the ductwork of new homes: soda cans and bottles, cigarettes, brown paper lunch bags, sawdust, nails, wood chips, screws, staples, drywall and drywall dust, and whole blocks of wood.

Your ducts also pick up things from the air and their surroundings, including pet dander, carpet fibers, dust mites, dead human skin, cigarette smoke, bacteria, viruses, insects, dead rodents, rodent droppings and urine, hair from humans and pets, decayed vegetation, mold, and residue from chemicals.

A professional duct cleaning service can properly clean your ductwork and registers with special high pressurized air. Many reputable companies draw the debris into vacuum trucks and dispose of it. Most homeowners who have had this service performed report fewer illnesses and allergies in family members, along with a more efficient HVAC system.

Ductwork maintenance and health - more reasons for cleaning your ductwork

Ductwork can get infested with rodents and their urine and feces. This could present a potential danger for homeowners. A potentially deadly disease called "hantavirus pulmonary syndrome" is carried by infected mice and rats, in their saliva, feces, and urine. When these body fluids dry, the virus becomes airborne. If humans breathe in particles containing the virus, they can contract this illness that might result in respiratory failure. 21 deaths in the U.S. have resulted from hantavirus since 1993.

One of the main health concerns associated with ductwork is mold. Anywhere moisture is present in your ducts, mold can grow. The mold spores can then wind up inside the living area of your home. Since many people are allergic to mold spores, all mold should be removed. In addition, the source of the moisture should be identified and eradicated so that more mold will not grow in the ductwork.

One problem with this is that most mold will not be visible. Even if you find a substance that looks like mold, it might not be a fungal growth at all. The best thing to do in this case is to secure some of the suspected substance on a piece of transparent tape and send it to a laboratory for a definative analysis. This costs about $50, but it's well worth the fee to be sure.

If, in fact, the growth is identified as mold, it needs to be removed from any hard duct surfaces by a technician. Any damp or moldy insulation must be replaced since it cannot be properly cleaned.

By keeping your ducts clean and properly maintained, you’ll save money on your electric bill and your home will be healthy and comfortable.


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    • habee profile image

      Holle Abee 7 years ago from Georgia

      Minhaj, thanks so much for reading about ductwork maintenance!

    • profile image 7 years ago

      great work,, thanks a lot !!

      its really informative !!

    • elf_cash profile image

      elf_cash 7 years ago

      Ductwork maintenance is very important!

    • habee profile image

      Holle Abee 8 years ago from Georgia

      Yes, Audrey, but all the ducts can't be in a straight row! lol

    • akirchner profile image

      Audrey Kirchner 8 years ago from Washington

      It is easy to forget your ducts! But it is far more important to have all your 'ducts in a row'....great information all kidding aside!

    • habee profile image

      Holle Abee 8 years ago from Georgia

      Thanks for visiting, Ethel!

    • habee profile image

      Holle Abee 8 years ago from Georgia

      Welcome, Bpop. Sorry you had a bad experience.

    • habee profile image

      Holle Abee 8 years ago from Georgia

      Consider yourself lucky, HH!

    • ethel smith profile image

      Eileen Kersey 8 years ago from Kingston-Upon-Hull

      Another informative Hub Habee

    • breakfastpop profile image

      breakfastpop 8 years ago

      Interesting hub. We have been told over and over again that cleaning the duct work is a waste of time. We spent 700 bucks on a filter that was supposed to be superior and it is a sham! I guess I will have to re-visit the issue again. Thanks for the info.

    • Hello, hello, profile image

      Hello, hello, 8 years ago from London, UK

      Thank you for a well written hub but thank goodness that is one of the things I don't need to worry about.

    • habee profile image

      Holle Abee 8 years ago from Georgia

      Thanks so much, Mama!

    • habee profile image

      Holle Abee 8 years ago from Georgia

      Veronica, I think prevention is always best, and not just with ductwork! lol

    • Mama Sez profile image

      Mama Sez 8 years ago from Canada

      Preventive maintenance for efficient performance makes a lot of sense Habee, this is a very helpful hub. Great job!!!

    • Veronica Allen profile image

      Veronica Allen 8 years ago from Georgia

      Prevention seems to the best method towards saving money and keeping your home in tip-top condition. Thanks habee for this good information.

    • habee profile image

      Holle Abee 8 years ago from Georgia

      Good for you! One less thing to worry about - no faulty ductwork!

    • Pamela99 profile image

      Pamela Oglesby 8 years ago from United States

      Thank goodness we had all that done just a few years ago. Good hub.