Ambient Air

What Is a Large-Diameter Hose?

What Is a Large-Diameter Hose? - Air Ventilator Heavy Duty

A large-diameter hose is any kind of ductwork with an inside diameter, or ID, that is larger than the IDs demanded by most applications involving hoses. Our perceptions of size are relative. Some users may consider a hose with an ID of 4 inches as a large-diameter hose. Whereas, others may not qualify a hose as large-diameter ducting unless it is at least 24 inches in ID. It all depends on the applications you typically deal with. Any hose that is wider than the typical hose used in your line of work may qualify as a large-diameter hose. Along these lines, it should be clear that there is no quantifiable standard for what constitutes a large-diameter hose. Any given flexible hose can be considered either small or large ductwork depending on the hoses to which you are comparing it. In any case, large-diameter, flexible ducting is generally rare because of the inherent fact that they accommodate situations that are beyond the norm. Nonetheless, it is not difficult to find an extra-large hose. is one of the places where you can find all sorts of large, flexible ducting. To make your search for a large-diameter hose easier, consider certain ideas: How are hose diameters measured? What is considered large diameter hose? Can ducts be too big? Can you oversize ductwork? How do you increase the diameter of a hose? As we explore the basics of what constitutes a large-diameter hose, we will also outline how a hose’s diameter—in general—is measured and the reasons for why it is measured the way it is. We will also consider the consequences of improperly sized ductwork, and we will take a look at how you can ameliorate issues involving your hose’s width. At the end of the day, remember that large-diameter hoses are often an overcomplicated subject. They work in the same way that normal-sized hoses do—but accommodate special applications that simply require larger widths of ducting.

Air Ventilator Black Flexible Ducting

Some Sizes Out of Stock Temperature Range: -20°F to +180°F Sizes I.D. (in.): 4, 6, 8, 10, 12, 14, 16, 18, 20, & 24

Neoprene Flex – 2 Ply Flex Hose

Lead Time 4-6 Weeks Temperature Range: -40°F to +250°F Sizes I.D. (in.): 1, 1.25, 1.5, 1.75, 2, 2.25, 2.5, 2.75, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 22, & 24

Thermoplastic Flex Medium-Duty WS Thermoplastic Rubber Duct

Temperature Range: -40°F to 275°F. Sizes I.D. (in.): 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 22, & 24

Urethane Flex Medium-Duty Polyurethane Duct

Temperature Range: -65°F to +225°F Sizes I.D. (in.): 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 12, 14, 16, 18, 20, 22, & 24

How Are Hose Diameters Measured?

Hose diameters are measured in terms of inside diameter, or ID. A hose’s ID is specified by measuring the diameter of the circle that forms the hose’s beginning or end, and its ID excludes the thickness of the hose’s walls. You can also think of a hose’s ID as the width of the hose, which is why a large-diameter hose is usually what people mean when they refer to a wide duct. Why are hoses measured in terms of inside diameter? From a practical point of view, it makes sense to standardize how hoses’ widths are expressed. Flexible ducting is designed to attach to an opening by wrapping over a hollow, cylindrical protrusion that extends from the opening—much like how a snake consumes a rodent. The cylinder has a certain diameter which includes the thickness of its walls. If hoses’ diameters included the thicknesses of their walls, a 3-inch-wide opening and a 3-inch-wide hose would be—for the most part—incompatible. Their openings would collide, as the thicknesses of their walls interfere with the ability for one object to wrap over the other. This is why hose diameters are quantified in terms of ID. Likewise, vents and other types of openings to which hoses are designed to attach are measured in terms of OD, or outside diameter. In short, a hose’s ID should match its destination’s OD. Why does this matter?

It is critical to know the relationship between inside and outside diameters; this relationship is the basis upon which every interaction between a hose and the object to which it attaches depends. It is a convention upheld by nearly every hose manufacturer, and it minimizes the amount of numbers buyers need to juggle while they shop for a new hose. For example, if your equipment’s exhaust-vent has an outside diameter of 8 inches, find a hose with an inside diameter of 8 inches. Thus, while it may seem perplexing at first, finding the right-sized hose for your application is an easy, straightforward process.

Urethane Flex Light Duty_Flex Shot

Can Ducts Be Too Big?

Ducts can be too big for the openings to which they are attached. If the duct’s inside-diameter is greater than the outside diameter of the opening to which the duct is attached, the connection between the two will be imperfectly sealed. This causes the items that the hose is intended to transport to leak out of the hose before they reach their destination. While ducts can certainly be too big, this does not necessarily mean that big ducts are bad. Many situations call for a large-diameter hose. So long as the application demands a hose with a large ID-size, large ductwork is never out of the question. Large scale, HVAC ducting projects may require items such as a large-diameter air-hose. While one may seem difficult to find, a large air-duct is offered by sites like Hoses such as those in our Air Ventilator series are come in very large ID-sizes—up to 24 inches wide! In addition to the variety of ID sizes for you to choose from, these hoses are highly durable, flexible, and compressible. For example, our Air Ventilator Black is made primarily of a polyvinyl-chloride-coated fabric and is reinforced with a steel-wire helix and an external wear-strip. Its compression ratio is 9-to-1—which means that a 9-feet length of hosing compresses down to 1 foot! This large hose, as well as the rest of the hoses in our Air Ventilator series, are just some examples of the many types of large ductwork we offer.

Can You Oversize Ductwork?

You can oversize ductwork if your duct has specialty cuffs that can reduce the size of the duct’s inside-diameter at its ends. Thus, while ducts can sometimes be too big, this does not always mean that oversized ductwork is bad. When you purchase your large hose, ensure that it comes with the right cuffs, such as belted cuff-ends, which can reduce the ID-size of the hose at its ends so that it properly fits over the opening to which you intend to connect the hose. In this vein, oversized is somewhat of a misnomer, as the right cuffs can turn a hose that would otherwise be too large into one that is properly sized toward the OD you are trying to match. For example, our Wind Handler series of ducts feature a wide variety of specialty ends for you to choose from.

While belted cuffs are capable of altering the hose’s ID-size at its ends—if you need to ameliorate an even larger difference in ID size, funnel cuffs can drastically reduce the hose’s ID-size at its ends. Thus, if you need a hose with an inside diameter that is significantly larger than the OD over which you intend to fit it, you can easily do so by acquiring a hose with funnel-cuff ends. This hose, just like our other large-diameter hoses, comes plenty of different ID sizes—many of which are incredibly large. As a matter of fact, we can even customize the ID size of your hose to reach up to 60 inches!

How Do You Increase the Diameter of a Hose?

The main way to increase the diameter of a hose is to acquire a new hose with a larger inside-diameter. There are few other ways to increase the diameter of a hose, and many of them are such a hassle that you may as well save yourself the headache and obtain a new hose altogether. A large flex-duct can be purchased in a multitude of different ID-sizes. The standard increments in which ID sizes increase are half-an-inch and 1 inch. However, say you need your large-diameter, rubber hose’s ID increased from 24 inches to 24.75 inches—companies like will happily customize a new hose for you with an inside diameter of 24.75 inches. Obtaining a new, larger hose is the best way to increase the diameter of a hose. But, what if you need to increase the diameter of your large hose only at its ends? In that case, acquire a large-diameter hose with funnel cuffs, specifying the ID size to which you need the hose’s ends to expand. offers a generous array of hoses with specialty ends—many of which are geared toward altering a hose’s ID-size at its ends, among other things. However, keep in mind that this second method of increasing the diameter of a hose does not increase the hose’s inside-diameter throughout its body. It merely increases the hose’s inside-diameter at its ends so that the hose can fit over larger ODs. If you need to increase your hose’s diameter throughout the entirety of the hose’s length, your best option is to obtain a new hose with the new, larger diameter that you need. And surely, your new, industrial-grade hose will be composed of robust materials whose advantages greatly outweigh the benefits of your old hose. In this vein—not only are you getting a hose with the inside-diameter size you need—you are also upgrading your hose to one that is much more durable and flexible.

Review: What Is Considered a Large-Diameter Hose?

Any hose with an inside diameter that is larger than that of the typical hose within a given category of applications is considered a large-diameter hose. Thus, what is considered a large-diameter hose in one set of applications may be considered a small hose in another set of applications. Size is a relative phenomenon; and this is especially the case when we abandon concrete quantifications of size in favor of comparative terms such as large and small. That being said, we can generally exclude hoses with ID sizes of, say, 1 inch from the category of large-diameter hoses since—even for applications that use 1-inch hoses—a hose of this size is still typically considered small. There are extremely few—if any—instances in which a 1-inch-wide hose is considered a large-diameter hose. (Perhaps a bug hobbyist might consider the 1-inch-wide tube connecting the chambers within her ant farm to be a large-diameter hose.) In any case, it should be clear by now that there are many types of large-diameter hoses available to you.

The best thing you can do is conduct a detailed analysis of your application: Consider the precise size of large ductwork you require. Determine the length of large, flexible ducting you need. And choose the material composition of your hose based on the type of material you intend to transport and the conditions within which you intend to place the hose. Choosing the right hose can sometimes feel overwhelming, but those factors we have just highlighted are the fundamental variables that can greatly narrow your options—leading you to the perfect hose that seems as if it was hand-crafted for your situation.

Wind Handler_Entry Shot

Bonus: What Is the Largest Hose-Size Offers?

The largest hose-size offers is a large-diameter hose with an inside-diameter size of 60 inches. This size of large-diameter, flexible hose is typically used for applications involving air ventilation since, at this size of inside diameter, the hose is often too wide to provide enough suction to transport things other than air. So, what is the largest hose-size we offer? 60 inches in inside diameter. In any case, hoses this large are very rare—so much so that we only offer a select few in this size. Our Air Ventilator hoses are some of the ducts we offer in this diameter. If you do happen to need a hose this large, give us a call or send us an email, as a 60-inch-wide hose is available only as a customized order. In addition, if you need a large-diameter hose in a custom length, we will happily cut your hose into any length—up to 50 feet! Doing this, of course, does not preclude a request to have your large ductwork’s ID-size customized, too. Regardless of how specific your requirements are, we are sure that we can craft you an order that precisely meets your needs.