How is Ductwork Sized?

Categories:HVAC
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When you’re building a new home, remodeling or updating your heating, ventilation or air conditioning system, ducts are a critical part. They’re responsible for transferring the heated or cooled air produced by the heating and cooling system into your St. George, UT, home’s living spaces. Here’s what you need to know about how ducts are sized and how we make sure your home has the right ductwork setup.

How Ductwork Sizes Are Calculated

When you’re getting new ductwork, we need several pieces of information in order to install the right size. The size calculations require the square footage of your home, the square footage of each room, cubic feet per minute calculations and the friction loss rate of the ducts.

Cubic Feet Per Minute

The cubic feet per minute refers to the rate of airflow through the ducts. It’s the number of HVAC unit tons multiplied by 400. Each room in your home has to be measured in order to make this calculation. The answer to this calculation determines how much air velocity is required to comfortably heat or cool your home. The size of your heating or air conditioning unit is measured in tons, and that information should be written on the owner’s manual or available on the manufacturer’s website.

Why the Right Size of Ducts Matters

If the ducts installed in your home are too small, your rooms won’t get enough airflow. Your heating and cooling system will have to work harder to achieve and maintain the temperature setting on the thermostat. Ducts that are too big reduce the airflow velocity, so you’ll barely feel a trickle of heated or cooled air in each room.

At Arctic Air of Southern Utah, we install all sizes of ductwork. St. George area homeowners also turn to us for reliable heating and air conditioning maintenance, repair, replacement and installation services. Our indoor air quality solutions help keep your home clean, safe and healthy. To learn more about how ducts are sized, give us at Arctic Air of Southern Utah a call today.

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