When it comes to transporting air, round ducts are usually the most efficient option. They require less material than rectangular ducts to handle the same amount of air, making them a great choice for those looking to save on costs. Rectangular ducts, on the other hand, are designed to fit into building construction and can be used in walls and ceilings. However, they use more metal than round ducts to produce the same airflow rate.
Oval ducts are flat and have smaller height requirements than round ducts. These ducts tend to become rounder when under pressure, making them a great option for those looking for a quieter alternative to rectangular air ducts. Spiral air ducts are a subset of round ducts that offer an even quieter option, as air can flow more easily along their curved design. The American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) has developed a set of guidelines for maximum airflow speeds in a duct system based on the location of the ducts.
Rectangular ducts are generally manufactured with two Pittsburgh-type joints, since two L-sections of a rectangular duct are usually assembled to form a single piece of duct. When it comes to choosing the most efficient type of duct for your needs, it's important to consider both the material used and the shape of the duct. Round ducts are usually the most efficient option in terms of material usage, while oval and spiral air ducts offer quieter alternatives. Additionally, ASHRAE's guidelines should be taken into account when selecting a type of duct.
