Ducting Insights

What is a Duct Hose?


At its core definition, a ducting hose is tube-like piece of equipment, with an opening at each end, which is made to transfer something from point A to point B. However, this is a broad and over-simplistic term that does not properly explain the features and functionality of Rubber-Cal’s ducting hoses. Our duct hoses are made specifically to move a range of media. This range includes five categories – air of varying temperatures, dust and other fine particles, abrasives, larger non-abrasive materials, and fumes.

There is no one ducting hose product that is perfectly suited for each type of material movement. A wide variety of hoses are available, made in different designs and with different materials including PVC, coated polyester fabric, neoprene, silicone, thermoplastic rubber, aluminum, stainless steel and more. Each material will provide different qualities. For instance, PVC ducting can provide a high degree of flexibility, while stainless steel is ultra-strong and rigid. Some materials provide a higher working temperature, while others handle exposure to chemicals. To ascertain what kind of duct is needed in any particular setting, you need to know what will be travelling through it, what temperature it must be able to handle, whether it needs any resistance to chemical exposure, whether it will be used with positive or negative pressure, and what size is needed in terms of length and diameter.

In most cases, the open ends of the ducting hose are attached in place using a connector, clamp or belt. The applications for a hose can include everything from transferring air within an air conditioning system, sucking up sand, pebbles and other small debris, to ventilating harmful fumes. In each of these applications – and many more – the hose itself does not have any powers of positive or negative pressure. It is simply there as a conduit, providing a channel to transfer materials from A to B.

Flexible Hose, How It Is Measured


One of the key aspects you need to establish when choosing the correct ducting hose is the size which is required. But how do you measure it? When looking at a ducting hose, there are two important measurements – the length and the inner or inside diameter, otherwise known as ID for short. The length is the measurement from one end of the hose to the other. With that said, there is a method to making this measurement which can sometimes be difficult, because a lot of ducting hoses are very stretchy with a high rate of compressibility. As a result, the length should be measured when the hose is fully stretched out and pulled tight so that there is no slack. This is the industry standard for ducting hose length measurement.

The inside diameter is a little more complex. This is the measurement across the opening at the end of a ducting hose. The inner diameter is established by measuring across the circular opening at its greatest point. There is a distinction between outer and inner diameter, but Rubber-Cal uses the inner diameter measurement for all hoses. The outside diameter takes into account the wall thickness of a hose while the inside diameter measurement is taken from inside the duct walls. An outer diameter measurement would be slightly larger, taking into account the width of the walls themselves.

When deciding what size duct-hose you need, it is important to remember that the inner diameter of a ducting hose should be the same as the outer diameter of the equipment or opening that you want to attach. A duct hose goes over a piece of pipe and the OD of the pipe must match the ID of the hose fitting over the pipe.

High Temp Silicone hoses


Silicone hoses stand out as a result of their unique and useful properties. Not all materials are suited for handling high temperature air, steam and toxic fumes, but this is an area where silicone has the edge on other hose materials. Silicone is one of the best materials for high temperature ducting. Most silicone hoses have an extremely high maximum temperature of about 500 degrees Fahrenheit. This abilityallows silicone ducts to remain effective, even when they are in hot environments orhave extreme heat passing through them. Another area which silicone hoses excel in is the handling of caustic air, fumes and chemicals, which might be harmful to other ducting materials. Having this level of resistance is vital in some situations. For this reason, silicone ducting hoses are extremely popular with companies requiring equipment for industrial settings and specialist applications.

Different variations of silicone are used in ducting hoses, with the type depending on the specific product it is used in. For instance, there is single-ply silicone, along with reinforced double-ply products. Some hoses are also reinforced with fiberglass. Those reinforced products usually have even greater capabilities, such as working temperature ranges reaching up to 750 degrees Fahrenheit. Most silicone hoses we offer are very flexibility but are not designed for constant flexing. Continuous flexingof silicone hoses can cause the flex hose to wear from Flex-fatigue. They are usually best suited for settings where repeated movement is not required. However,silicone hoses are some of the very best options when it comes to high-temperatureresistance ducting in harsh industrial applications.