How do you design duct size?

How do you design duct size?

How do you design duct size?

To calculate the required equipment size, divide the HVAC load for the entire building by 12,000. One ton equals 12,000 BTUs, so if a house or office needs 24,000 BTUs, it will take a 2-ton HVAC unit. If you get an uneven number, such as 2.33 for a 28,000 BTU load capacity, round up to a 2.5-ton unit.

What is the standard size of duct?

The size of ductwork affects the amount of airflow and its velocity and is very important in how well the HVAC system operates. Rectangular ducting can come in various sizes from 3” x 7” up to 35” x 40”; and round ducting can be anywhere from 4” to 41” in diameter.

What is GI duct?

Most ductwork is constructed of galvanized steel sheet, also known as galvanized sheet metal. It’s the most common material used in fabricating ductwork that prevent rusting and avoid cost of painting. They are also facilitated with sound proofing and high degree insulation.

What is duct thickness?

Thickness of sheet metal used in ductwork.

Comments Sheet Metal Gauge Sheet Thickness (inches)
SMACNA1) Ductwork 18 0.0500
19 0.0437
20 0.0375
21 0.0343

Is round or square duct better?

With less surface area, no corners, and better airflow, round metal duct work eliminates the chances of dirt and bacteria accumulating in the duct.

What are the different types of ductwork?

There are three main types of rigid ductwork: sheet metal ducts, fiberglass lined ducts, and fiberboard ducts.

What are the types of duct?

Here are the most popular types of duct materials and what they are used for:

  • Galvanized Steel. Galvanized steel is the most common material used in ductwork fabrication.
  • Aluminum. The next popular duct material is aluminum.
  • Stainless Steel.
  • Carbon Steel (Black Iron)
  • Non-Metallic Ducts.
  • Round.
  • Rectangular.
  • Oval.

What gauge is most ductwork?

Gage-It Right The thinnest acceptable sheet metal for ductwork used in a single dwelling is 28 gage or 0.013 and 0.018 inches for galvanized and aluminum, respectively. This measurement is for around duct smaller than 12 inches in diameter and a rectangular section no bigger than 8 inches.

What is gauge in duct?

24 gauge is used for the duct size above 300mm to 750 mm and thickness is 0.6mm. 22 gauge is used for the duct size above 750 mm to 1200 mm and thickness is 0.8mm. 20 gauge is used for the duct size above 1200 mm to 3000 mm and thickness is 1mm. 18 gauge is used for the duct size above 3000 mm and thickness is 1.2mm.