![]() Wherever you are needing air to leave the ductwork and enter the open space, a hole is cut in the duct work and these diffusers are then sealed into the duct work. This product also does come with all the necessary screws and foam pieces for proper installation. With that comes the need for these spiral duct vents. It is becoming more and more common for businesses to have an industrial look to their buildings, leaving most ductwork exposed in their ceilings. Our Double Deflection Spiral Duct Diffusers are available in an unfinished aluminum look and come in 3 different sizes. They cannot be bent so they are usually assembled with elbow fittings that allow the duct to turn 45° or 90°. The more elbows you add, the shorter your duct can be.įor optimal dryer duct performance, it’s best to pair a good galvanized steel sheet metal with fiberglass insulation.Commercial Duct Diffuser - Double Deflection Vent w/ Scoop One thing to note about galvanized sheet metal is that it isn’t the easiest to work with. If you want to use galvanized steel for your ductwork then galvanized sheet metal is the top choice. This makes them ideal for commercial usage and in households that run the dryer a lot. ![]() It also makes it less likely for lint to collect. Their smooth interior surface allows air to flow freely without friction. The interior of a sheet metal duct is smoother than that of both galvanized spiral ducting and flexible galvanized steel ducting. Galvanized sheet metal ducts are made with straight rigid metal, averaging 0.0157-0.0787″ in thickness. By equalizing the airflow, the duct reduces the noise that’s released due to reverberated air pressure. The spiral design helps to equalize the pressure as air flows out of the duct. If you can or do end up using spiral ducting, then there are other benefits. Because they are not completely smooth, I would hesitate to use spiral ducting for a dryer without consulting a professional. Spiral ducts do not impede airflow or catch lint because the interior surfaces of these ducts are relatively smooth. It is a spirally wound pipe that is manufactured from galvanized steel sheet, which ranges in thickness from 0.0157-0.0787″ (0.4-2.0 mm), making it code compliant in terms of being metal and of an appropriate thickness. Galvanized spiral ducting is a popular duct design for ventilation and exhaust systems. They must be easily accessible for regular maintenance and emergencies. This is particularly important if you choose to use flexible duct anyway.įlexible galvanized ducts can be used as the transition ducting for a dryer, but they cannot be concealed in the walls or floor. This means that even if flexible duct was code-compliant in other areas, you would have to be very careful about what thickness of ducting you purchased. You can also find flexible ducts with a thickness of 0.0394″ (1.0 mm). However, there are still ridges and so they violate the code and pose a risk to safety.įlexible galvanized steel ducts can come in thicknesses as low as 0.0007″ (0.018 mm), which is well below the minimum IRC thickness requirement of 0.0157″ (0.3950 mm). Unlike foil flexible ducts, the ridges in flexible galvanized steel ducting aren’t deep, so they do not have such a large impact on airflow and lint collection. Instead, it features ridges throughout the interior and exterior length of the duct. Ridges trap lint and create resistance to airflow, which also leads to lint deposition. The interior finish of flexible galvanized ducts isn’t completely smooth. They are most ideal for low-pressure ventilation or exhaust systems. Being made of steel, galvanized ducts all meet the one requirement: they are made from metal.īut what about the smooth interior surface and the thickness? Flexible Galvanized Steelįlexible galvanized steel is designed to offer both the strength of galvanized steel and flexibility. ![]() ![]() Galvanized ducts, which are steel metal ducts with a protective layer of zinc, are allowed by the IRC, but only if they meet the above-stated requirements, which not all types do. Now, does galvanized ducting meet these requirements? Types of Galvanized Ducting So, it’s best to check your local codes as well. The metal must not be less than 0.0157″ in thickness.Īlthough most states go with established IRC dictates, some cities have unique requirements.Ducts should be constructed with metal.Dryer ducts should have a smooth interior finish.Here are the IRC requirements for dryer duct materials found in Section M1502.4.1: Lint is known to be flammable, so dryer ducts must be made from fire-resistant materials that should also ensure that the risk of lint accumulation is as low as possible. Fabrics shed lint while they are being tumbled in the dryer and a significant portion of the lint goes into the duct. ![]()
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