## What is oval ductwork used for?

Oval Ductwork Size This allows the oval ducts to fit in tighter spaces while still maintaining a better airflow efficiency than rectangular ducts. This allows you to squeeze them in places around your building to better benefit the airflow around your business.

How do you calculate 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.

How do you calculate flexible duct size?

Measure the length and width of the room where the flex duct will be supplying the air. Multiply the length and width together to get the square footage of the room. For example, a 10-by-10 room will be 100 square feet.

### What is duct equivalent diameter?

The equivalent diameter is the diameter of a circular duct or pipe that for equal flow gives the same pressure loss or resistance as an equivalent rectangular duct or pipe. A round shape results in lower pressure drops and less fan horsepower to move the air and, consequently, smaller equipment.

What shape of duct is most efficient?

Round Round
Round. Round ducts are the most efficient in transporting air. They use less material than rectangular ducts to handle the same amount of air.

Is spiral duct watertight?

In a spiral duct, your air pressure drop is lower when comparing it to the classic rectangular ductwork. Oval spiral ducts are also watertight – while humidity is easily amplified in a restaurant setting, this reliable form of duct will ensure no water will drip or pool where your customers enjoy their meal.

## What size duct do I need for 2000 cfm?

Equivalent diameter for rectangular and circular ducts – air flows between 100 – 50000 cfm

Air flow – q – (Cubic Feet per Minute, cfm) (m3/s) Rectangular Duct Sizes (inches) (mm) x (mm)
1700 (0.77) 10 x 22 14 x 15
1900 (0.86) 12 x 19 14 x 16
2000 (0.9) 10 x 25 12 x 20 15 x 16
2500 (1.13) 14 x 20 15 x 18

How many CFM can a 4 duct handle?

Reviewing the chart, a 4” pipe will convey 395 CFM at 4500 FPM. This means that a 4” pick-up on a machine will use 395 CFM from the filtering system; or, if you know that a machine will require approximately 400 CFM to remove the waste, you should use a 4” pipe for that purpose.

What size duct is needed for 1000 cfm?

Equivalent diameter for rectangular and circular ducts – air flows between 100 – 50000 cfm

Air flow – q – (Cubic Feet per Minute, cfm) (m3/s) Rectangular Duct Sizes (inches) (mm) x (mm)
800 (0.36) 8 x 15 10 x 12
1000 (0.45) 10 x 14 12 x 12
1300 (0.59) 12 x 14
1400 (0.63) 12 x 15

### How many CFM is a 4 inch duct?

How do you calculate duct work size?

Calculate the square footage of your round duct work. Measure the diameter of the duct then divide it by 2 to get the radius. Square the radius then multiply the radius by Pi, or 3.14. This will give you square inches of the duct. Divide that total by 144 to get square feet of the actual duct.

How is ductwork sizing determined?

How to Determine Duct Size Per Room Look at the plate on your furnace to figure out how many BTUs it produces. Divide that number by 10,000 BTUs. Multiply that number by the amount of cubic feet of airflow per minute (CFM) your type of furnace produces. Divide your number by 10. Calculate the size of your ducts vents by multiplying the length by the width.

## How to check duct system size?

000 BTUs.

• Multiply that number by the amount of cubic feet of airflow per minute (CFM) your type of furnace produces.
• Divide your number by 10.
• Calculate the size of your ducts vents by multiplying the length by the width.
• How do you calculate the CFM of a duct?

Measure the length and width of the room where the flex duct will be supplying the air. Multiply the length and width together to get the square footage of the room. For example, a 10-by-10 room will be 100 square feet. Figure out the amount of CFM that is required for the room. Properly ventilated homes use 1 CFM per square foot of space.