Ducts are wide pipes used for heating, cooling and ventilation purposes and they are often used in large establishments.
The air should be clean, provide the appropriate amount of ventilation and take in the right amount of heat to cool the conditioned areas. To bring air to the conditioned areas, air carriers are needed, and these are called ducts. Ducts act on the rule of pressure difference. When there is pressure difference, air progresses from an area of high pressure to an area with lower pressure. The greater the air difference present, the quicker the progression of air into an area of lower pressure.
Classifications of Ducts:
There are three common classifications of ducts: conditioned air ducts, re-circulating air ducts and fresh air ducts. Conditioned air ducts bring in conditioned air from the air conditioner and then disseminate it to the conditioned area. Re-circulating air ducts get air from the conditioned area and disseminate it back to the air conditioning system. Fresh air ducts carry raw fresh air into the air conditioning system from outside the conditioned area.
The ducts that are utilized in delivering air usually have a round, square or rectangular shape. Round ducts are the most effective in delivering air because of the air volume they are able to handle per perimeter distance. In other words, they will save you a lot of money because a smaller amount of material is needed for a similar amount of air flow compared to square or rectangular ducts. Square or rectangular ducts are preferred in construction buildings. They easily fit above ceilings and in walls and they are easier to put in the middle of joints and studs.
What are ducts usually made of?
Ducts can be made of metal, wood, ceramic or plastic. Most frequently used is a sheet steel covered duct with zinc or galvanized steel. Sheet metal brakes and molding machines are used to put the ducts together. Elbows and other connectors, such as branches, are also used to connect ducts.
Sheet metal ducts enlarge and then shrink as they warm up and cool down. Fabric joints are often used to take in this progression. Fabric joints are preferred to be used where the duct is connected to the air conditioner. Many ducts are kept in a secluded area to lessen the clamor and the heat transmission. Coverings can be placed on the inside or on the outside of the duct. Adhesives or metal clips are commonly used to support the covering of the duct in place.
Why is steel ductwork commonly used?
- Bigger Savings
Steel ductwork usually has a sleek surface; it allows effectively for air to flow around your house or office, unlike other similar products. Steel ductwork is sturdy and does not easily deform nor inhibit the air movement. Good air circulation signifies that your heating and cooling facilities do not have to work twice as hard, unlike other duct systems, and it will lower your energy costs. Steel ducts are to be preferred to polyester which tends to bend and break easily, causing an obstruction and a reduced airflow.
Steel ductwork is made of very durable galvanized steel, which is usually stainless. This gives an extensive life span to your ductwork system. Steel duct is resistant to damages, such as punctures and other signs of wear and tear. This gives it an advantage over other duct systems made from polyester, fiberglass etc.
- Easy To Clean
For hygienic reasons, the air distribution system needs to be cleaned at regular intervals to eliminate dirt and dust that can harbor bacteria and can endanger one’s health. Dirt also reduces the effectiveness of the air distribution system. Steel duct systems are considered the easiest duct systems to clean. Also, they are robust and will not rip or tear even with strenuous cleaning, unlike with polyester, where vigorous cleaning methods can damage the duct system, leading to reduced air flow.
Safety should always be the most important feature. Some duct systems claim to be "fire resistant", but steel ductwork is entirely made up of steel and is therefore obviously non-combustible. Other duct systems made of plastic and polyester can emit toxic fumes when burning, thus making it very dangerous to one’s health. Using steel ducts for your duct system will not only cost less, but they are also entirely fire resistant. So whatever happens, it is a win – win deal for you.