In a duct with a specified size of 24 x 36, what should be considered during fabrication?

When fabricating a duct with specified dimensions of 24 x 36 inches, one critical consideration is the dimensional allowance for the liner. This allowance is important because it accounts for any additional materials that will be added to the ductwork after fabrication, such as insulation or internal lining materials. If the allowance is not correctly accounted for, the finished duct may end up being either too large to fit into the intended space or too small to accommodate the insulation or lining, which could compromise the duct's efficiency and effectiveness.

In the context of sheet metal fabrication, understanding and applying dimensional allowances ensures that the final product meets the required specifications for both size and performance. This attention to detail is crucial in maintaining airflow efficiency and minimizing energy loss in HVAC systems.