|
There is a growing trend in the air conditioning and
heating industry for homeowners to have their ducts cleaned. This trend is due
in part by increased indoor air quality awareness. The first question a
homeowner must ask themselves is do I need my ducts cleaned and what has caused
my ducts to get dirty in the first place? It is a simple question, but one that
is most often overlooked.
Poor filtration and inadequate moisture removal are the two most
common causes of dirty ducts in Houston and surrounding areas. If you have your
ducts cleaned and do not address the cause why you are having you ducts cleaned
your problem will more than likely return. Plus, most of the ductwork in the
Houston area is made up of flex duct. Flex duct is generally made up of three
components:
-
Plastic inner liner: This inner
liner is used to provide the main pathway for air flow. It is
basically a metal slinky that is stretched and wrapped in
plastic. The inner liner is fragile and can easily be punctured
causing air to escape to the attic, between floors and walls.
If this happens the home wants to make up the lost air and turns
into a large vacuum pulling foreign air from doors, windows,
wall plugs, attic staircases, recess lighting cans, etc.
Bringing in air from outside the home usually causes increased
dirt, dust and humidity levels which can greatly effect the
homes indoor air quality.
-
Insulation: As of today, the
required insulation rating of ductwork is R-6. Insulation is
important in preventing heat transfer to and from the inner
plastic liner.
- Radiant Barrier/Outer liner: Since most of the ductwork in
the Houston area is installed in the attic it is important to
combat radiant heat. Most of today’s flex duct uses a radiant
barrier to reflect radiant heat away from the inner liner. This
helps to keep temperature differences to a minimum. Make sure
that your ductwork has a radiant barrier. Some of the older
homes in Houston have a grey/black outer liners that absorb
radiant heat. This has a tendency to make the inner liner
brittle increasing the risk of air leakage.
Duct cleaners use brushes to nock dirt and debris off the inner
liner then the dirt particles are sucked into a large vacuum.
The problem with flex duct is that it is ribbed and thorough
cleaning is near impossible. Plus, the plastic inner liner is
fragile and has a tendency to break when poked with a brush.
When the inner liner is broken it allows air to escape into the
attic, between floors and walls. This leakage will negatively
impact indoor air quality.
The best solution to having clean ducts is to first find out
what is causing your ducts to get dirty then, fix the problem
and replace contaminated sections of ductwork. This approach is
by far the best way to improve your indoor air quality and
prevent wasting money on duct cleaners who can make the problem
worse.
Kyle Jeane
Labrador Mechanical, Inc.
|