Air Exchange Rate: What to Know

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Your indoor air quality and overall comfort rely heavily on a specification called “air exchange rate.”

Your HVAC system continuously delivers new air volume to every room through supply ducts while removing air through the return ductwork. How many times this turnover occurs in one hour in any given room is the air exchange rate. For example, in a room with a calculated exchange rate of 8, the total volume of air in the room is removed and replaced by new incoming air 8 times per hour.

How Many Air Exchanges are Recommended?

Air exchange rates depend on the size, occupancy, and activity level inside a room. A single bedroom, for example, might have a recommended rate of 6, while a kitchen or family room might require air exchange of 8 for optimal air quality and temperature control.

How is Air Exchange Calculated?

Using specialized equipment to measure incoming airflow through supply vents, an HVAC technician determines air volume expressed in cubic feet per minute (CFM). After multiplying the figure by 60 minutes per hour, that result is then divided by the total volume of the room, determined by multiplying dimensions of length x width x height. This final figure represents the current air exchange rate for that specific room.

How Can You Improve Air Exchange?

An air exchange rate that doesn’t meet recommended specs may result due to:

Need more info about improving the air exchange rate in your home? Contact the professionals at Jackson & Sons.

Jackson & Sons, Inc.

Our goal is to help educate our customers in Eastern North Carolina (including Wayne, Johnston, Greene, Lenoir, Pitt and Duplin Counties) about energy and home comfort issues (specific to HVAC systems).

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Dependable Service Throughout Eastern NC

When you need heating or air conditioning repairs, maintenance or system replacements, you need a company you can count on for dependability and quality service. Contact us at Jackson & Sons at 919-734-9611. Our professional team of technicians look forward to providing energy efficient and cost effective solutions to keep your home or business comfortable at all times.

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