Airflow and Duct Planning

Duct / CFM / Airflow Calculator

How much airflow does my AC need?

A common residential airflow target is about 350 to 450 CFM per ton, with 400 CFM per ton as a planning midpoint. Actual airflow depends on blower settings, duct size, return air, filter restriction, static pressure, coil condition, and room layout.

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Attic ductwork and airflow paths for a duct CFM calculator. — How much airflow does my AC need?

Airflow math should lead to measurement

Four hundred CFM per ton is a common planning midpoint, but the real system has to be measured. Static pressure, blower setup, return size, filter restriction, duct layout, coil condition, and dampers can all change delivered airflow.

The calculator gives a target total CFM and an average per supply run. That answer is useful for asking the next question: is the duct system actually moving enough air without excessive pressure?

Target airflow often starts around 350 to 450 CFM per ton.
Static pressure should be checked before major duct decisions.
Restrictive filters and weak returns can reduce delivered CFM.

Comfort symptoms tied to poor airflow

Weak vents, frozen coils, noisy returns, hot rooms, high humidity, and short cycling can all be airflow symptoms. Sometimes cleaning helps, but duct sizing, leakage, crushed flex duct, return air, or blower settings may be more important.

Use this page with duct cleaning, duct repair, and AC maintenance content so the homeowner sees airflow as a system issue rather than a single vent problem.

Frozen coils can be related to low airflow.
Hot rooms may need balancing, duct repair, or return-air review.
Duct cleaning is only one possible airflow fix.

Broward HVAC Answers This Calculator Supports

Local answer target

Is 400 CFM per ton always the right answer?

No. It is a planning midpoint. Actual airflow targets can change with equipment, humidity strategy, blower setup, duct design, static pressure, filter restriction, and coil condition.

Next step: Measure static pressure before making major duct decisions.

Local answer target

What Broward comfort symptoms point to airflow trouble?

Hot rooms, weak vents, noisy returns, high humidity, frozen coils, dust problems, and short cycling can all point to airflow issues. Cleaning is only one possible fix.

Next step: Review return air, duct sizing, leaks, dampers, and filter restriction.

Local answer target

How should CFM math be used with duct service?

The calculator sets a target so the technician can compare it with delivered airflow. That helps separate duct cleaning, duct repair, balancing, return-air, and maintenance conversations.

Next step: Use the result with duct cleaning and duct replacement guidance.