Rectangular Ducts - Standard Sizes and Ancillaries

Why Rectangular Duct Rather Than Round Duct? Rectangular duct is often the ducting format of choice when installation space is tight. Where a volume of air needs to be moved and you have a rectangular hole to duct it through, the rectangular duct is the space effective solution. But there is another consideration beyond space. Whereas an unusual duct size might at first sight be the best use of space; it is also worth appreciating the array of standard ancillary equipment that can be connected to the more standard rectangular duct sizes. What Is 'Standard Size' Rectangular Duct? The trouble with ducting is that, once formed, it takes up a lot of storage space and therefore pre-formed ducting is not something that sits in large quantities on a shelf waiting to be sold. Most ducting is made to order. Rectangular ducting can in fact quickly and easily be folded to any size, within the limitations of the equipment deployed to make it, and 'Mez' or 'Doby' flanges are easily fitted to each end. However if there is a standard it is that most catalogue information about rectangular duct recognises height and width variations in 50mm and 100mm increments. Therefore 500 x 300mm would be considered a standard size but rectangular duct measuring 467 x 932mm would not. You can have either fabricated easily, however you can only get a cracking range of ancillaries for heating, cooling, demisting, filtering and moving air if you go with standard sizes.  The best range of ancillary equipment comes when the standard rectangular duct dimensions falls with in the following sizes (see full article). With the greatest range of accessories for rectangular duct heights ranging from 200 to 500mm it makes this range of standard sizes brilliant for installing into void spaces. This is especially relevant to those smaller and older buildings where you might be looking to retrofit mechanical ventilation to provide those all important air changes to make them safer in this Covid 19 era.

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