# Duct Leakage Calculator

## About Duct Leakage Calculator (Formula)

The Duct Leakage Calculator is a tool used to estimate the amount of air leakage in a duct system based on the design flow and allowable leakage percentage. This calculator is commonly used in HVAC (Heating, Ventilation, and Air Conditioning) systems to assess the efficiency and performance of ductwork.

The formula used to calculate the duct leakage is as follows:

Duct Leakage = (Duct Design Flow * Allowable Leakage Percent) / 100

In this formula, the “Duct Design Flow” represents the intended airflow through the duct system, measured in Cubic Feet per Minute (CFM). The “Allowable Leakage Percent” indicates the maximum acceptable percentage of leakage in the duct system. The formula divides the product of the design flow and allowable leakage percentage by 100 to obtain the duct leakage value.

By applying this formula, the calculator estimates the amount of air leakage in the duct system. This estimation helps in evaluating the system’s performance and determining if any corrective measures are necessary to reduce leakage and improve efficiency.

The Duct Leakage Calculator simplifies this calculation by allowing users to input the design flow and the allowable leakage percentage. Upon clicking the “Calculate” button, the calculator applies the formula and displays the estimated duct leakage.

It’s important to note that duct leakage can have significant effects on system performance, energy efficiency, and indoor air quality. Higher levels of leakage can lead to reduced airflow, decreased system efficiency, and compromised air distribution.

By utilising the Duct Leakage Calculator, HVAC professionals, engineers, and technicians can quickly assess the potential leakage in a duct system, enabling them to identify areas for improvement and make informed decisions for system optimization and energy conservation.