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What size duct will work with a 4 ton unit?

To determine the appropriate duct size for a 4-ton air conditioning unit, several factors need to be considered, including the specific model and configuration of the unit, as well as the layout and design of the ductwork system. In general, a 4-ton unit requires a duct system that can provide sufficient airflow to meet the cooling capacity of the unit.

The size of the ductwork is typically expressed in terms of its cross-sectional area, measured in square inches. The total cross-sectional area of the supply ducts should be equal to or greater than the total cross-sectional area of the return ducts. The specific duct sizes required will depend on the length and complexity of the duct runs, as well as the static pressure requirements of the system.

As a general guideline, the following duct sizes are commonly used for a 4-ton unit:

- Supply ducts: 14 inches x 20 inches (for a total cross-sectional area of 280 square inches)

- Return ducts: 16 inches x 24 inches (for a total cross-sectional area of 384 square inches)

It's important to note that these are just general recommendations and the actual duct sizes may vary depending on the specific requirements of the system. To ensure proper airflow and system performance, it is advisable to consult with an HVAC professional who can perform a detailed load calculation and design a ductwork system that meets the specific needs of your home and air conditioning unit.

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