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# ACCA Duct Calculator Online

Understanding and accurately calculating duct sizes in HVAC installations is a pivotal part of achieving energy efficiency and comfortable conditions. The ACCA Duct Calculator emerges as an essential tool, simplifying the complex calculations needed to accurately size ducts.

## Definition of the ACCA Duct Calculator

An ACCA Duct Calculator is a tool used to calculate the size of the duct required for a specific airflow based on velocity pressure constant and total pressure constant. These constants depend on factors such as the duct system type, the duct shape, and desired airflow velocity.

## How the ACCA Duct Calculator Works

The calculator requires three inputs – airflow in cubic feet per minute (CFM), velocity pressure constant, and total pressure constant. It uses these values in a straightforward formula to determine the duct size. Importantly, these calculations are based on guidelines from the ACCA’s Manual D, the industry standard for ductwork design.

## Formula and Variable Description

The formula used in the Calculator is

Duct Size (square inches) = Airflow in CFM / (Velocity pressure constant x Total pressure constant).

The airflow in CFM is the volume of air that passes through a specific area in one minute. The constants relate to factors unique to each HVAC installation and can be obtained from Manual D or specialized software.

## Example Calculation

For example, suppose we have an airflow of 1000 CFM, a velocity pressure constant of 0.5, and a total pressure constant of 2. Plugging these values into our formula gives a duct size of 1000 / (0.5 x 2), equating to a 1000 square-inch duct size.

## Applications of ACCA Duct Calculator

### Residential HVAC Installation:

Accurate duct sizing is critical in residential HVAC installations. Improper sizing can lead to uneven temperature distribution and increased energy consumption.

### Commercial HVAC Design:

In commercial settings, precise duct sizing is essential due to the larger scale of systems and the diversity of building layouts and usage.