Note any deficiencies and make any minor repairs that are obvious. Walk or crawl the system and inspect for any defects that could make it un-balanceable. (Email Doc at the end of the article for a free air balance report if you don’t have one.) Then number the return grilles after the same mannerīefore balancing, fill in the design portion of the report. You may start with the one farthest from the fan. This data will be used to substantiate and cross reference your field measurements.ĭraw a rough floor plan of the house, or each system, and number the supply registers in the order you will be testing and balancing (1, 2, 3, etc.). You’ll also need to find the fan total external static pressure rating, blower motor horsepower and other key information for the balance report. This can be done using Manual J or one of several estimating techniques, including calculating air changes. Divide the total system airflow so each room has its share. While few homes have mechanical plans or specifications to follow, you can reverse engineer the necessary information required to balance most systems.įirst, find the equipment model numbers and go online to the manufacturer’s website to get the engineering information on that specific piece of air-moving equipment.įind the tonnage or heating output to determine required system airflow. If there is anything I have pleaded with you to do over the years, this one thing will give you the greatest results. The reason for this obsession of mine is that balancing is the single-most important step that can be taken to assure your systems produce comfort and operate efficiently. Many of articles I write have something to do with air balancing. So let’s take a long-overdue look at the basics of simply balancing a residential system. After 25 years and nearly 300 articles for Contracting, I realized I’ve never written a comprehensive article about how to balance a residential HVAC system.
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