Galvanized & Stainless Steel Ductwork
US Duct provides A FULL LINE of standard and special fabricated industrial ducting, including Galvanized ductwork, Stainless steel ductwork and Carbon Steel. Our clamp together ductwork provides easy-to-construct ventilation for equipment manufacturers and contractors. Our standard and special designs can be tailored to a host of applications, including the machining, material handling and pharmaceutical industries. Just tell us your application and requirements – US Duct is fully equipped to provide custom galvanized and stainless steel ductwork to suit your specific needs.
In order to satisfy the diverse needs of our customers, we offer a large range of options beyond stainless steel ductwork. For instance, we offer products in a variety of sizes beginning at 3”. Our options for gauges range from 24” to 3/16”.
In addition to providing all of these options, we ensure that you receive every component that you need from us. We offer a full range of standard and special design products. We can also supply you with all types of joining methods, including flanges, raw ends, airtight clamp-connect tubing and rolled-lip (Clamp Together) ducting.
If you are interested in retaining our services for galvanized ductwork, send us your information and requirements so that we can begin to assemble the components necessary for your system. Since we are able to produce custom ductwork to fit specific needs, we can fill any order, no matter how complicated.
Download Bid Specs
Contact Us Today
A Word About Stainless Steel Ducting
All ducting steels have the same basic iron and carbon composition, but stainless steel ductwork also contains a healthy dose of chromium—the alloy that gives stainless steel its famous corrosion resistance.
There are multiple grades under the stainless steel umbrella, each with slightly different alloy composition, and therefore slightly different physical characteristics.
Stainless steel must contain at least 10.5 percent chromium. Depending on the grade, it may contain much higher chromium levels, and additional alloying ingredients like molybdenum, nickel, titanium, aluminum, copper, nitrogen, phosphorous and selenium.
The two most common stainless steel grades for ducting are 304 and 316. The key difference is the addition of molybdenum, an alloy which drastically enhances corrosion resistance, especially for more saline or chloride-exposed environments. 316 stainless steel contains molybdenum, but 304 doesn’t.
For outdoor and some corrosive ductwork applications, stainless steel is an ideal corrosion-resistant material, but it will only withstand long-term exposure if the grade is appropriate for its environment. 304 is an economical and practical choice for most environments, but it doesn’t have the chloride resistance of 316. The slightly higher price point of 316 ducting and components may be well worth it in areas or applications with high chloride exposure. Each application for stainless steel ductwork has its own unique demands, and needs a stainless steel that’s up to the task.
A Word About Galvanized Ductwork
Most ductwork manufactured of galvanized metal is hot-dip galvanized, a process of coating steel with a thin zinc layer, by passing the steel through a molten bath of zinc at a temperature of around 860 °F (460 °C). When exposed to the atmosphere, pure zinc reacts with oxygen to form zinc oxide, which further reacts with carbon dioxide to form zinc carbonate, a dull grey, fairly strong material that stops further corrosion in many circumstances, protecting the steel below from the elements. Galvanized steel is widely used in ductwork applications where rust resistance is needed, and can be identified by the crystallization patterning on the surface (often called a “spangle”).
The process of hot-dip galvanizing results in a metallurgical bond between zinc and steel with a series of distinct iron-zinc alloys, creating a versatile and affordable material for manufacturing ductwork and duct components. The resulting coated steel can be used in much the same way as uncoated. Galvanized steel is suitable for high-temperature applications typically up to 392 °F (200 °C). Use at temperatures above this level can result in peeling of the zinc at the intermetallic layer. Galvanized sheet steel ducting is commonly used in most duct collection ducting applications.