Round plastic ducting has the greatest airflow performance but can be more difficult to conceal, whereas flat channel duct can be concealed within voids and flush fit, but has a lower airflow rate. Temperature range tolerances are from between -15 to +60 degrees Celsius. It is usually made fr...
Round plastic ducting has the greatest airflow performance but can be more difficult to conceal, whereas flat channel duct can be concealed within voids and flush fit, but has a lower airflow rate.
Temperature range tolerances are from between -15 to +60 degrees Celsius. It is usually made from a PVC Polystyrene or ABS plastic, and is less prone to corrosion than metal ducting, as condensation trapped within a duct run can corrode metal ducts over time. Condensation traps placed within a vertical duct run will prevent the build-up of liquid water accruing over time. Ensure that there is an appropriate drainage point for the water to drain to.
Installing Pipes and channel lengths can be achieved with push-fit connections, as they are “female” and will accept male connecting parts such as bends or reducers. If your pipe or flat channel needs to be cut, use a hacksaw and then rub down the cut point with coarse sandpaper. Duct tape or sealant can then be used for an airtight finish. Self-tapping screws should be used to secure into place.
If your duct run is going to be travelling through any colder areas such as loft voids, it is recommended that you make use of insulated ducting. This reduces the likelihood of condensation forming within the ducting itself, which will decrease the chance of any mildew or mould forming. It is also due to potential condensation formation, that we recommend you install any duct runs to flow away from the ventilation unit rather than towards it. This prevents any condensation that has formed travelling towards the unit and potentially causing harm to it.
Plastic ducting can be painted using an emulsion paint colour of your choice. You may need several coats to achieve a less “patchy” finish. It is recommended that you rub-down the ducting you wish to paint with coarse sandpaper to allow the emulsion paint to adhere more thoroughly.
Should you require a combination of both round and flat ducting lengths due to space restrictions or any other reason, you can use an adaptor. This lets you adapt round ducting run to flat.
To reduce the diameter of your duct runs, you can connect a length of ducting to a reducer. Multiple sizes of plastic ducting reducer are available and use simple push-fit connections. If venting an extract fan, it is recommended that you check the power of the unit. Changing the sizes of the ducting can increase or decrease the pressure within the run, therefore either increasing strain on the unit or decreasing its efficiency.
i-sells highly recommends using “Kair” brand of ducting to complete your duct run. Due to differences in the manufacturing process, If you mix and match ducting brands, they may not join together smoothly even if they are listed as being the same size. Keeping the ducting to one brand will reduce the likelihood of this happening.
Round ducting has the highest airflow performance and is recommended for most applications where possible. Its main purposes are for long ducting runs, whole-house ventilation systems, bathroom, toilet and utility room extract fan venting. Sizes are available from 100mm, 300mm, 500mm and 600mm diameters, with sizes between these dimensions also available. Both round and flat ducting have smooth inner surfaces to reduce air resistance and noise.
Pros & Cons of Round Ducting
Difficult to conceal
Inappropriate for low-pressure systems
Better for high-pressure systems
Designed for HVAC systems
Flat Channel Duct:
Flat channel ducting is ideal when a low profile is required due to lack of space. It can also be concealed and flush fit against ceilings and walls or within voids. Generally used for installations requiring low extraction rates such as bathrooms, toilets, and utility rooms. Sizes available from 110x54mm to 310x29mm.
Pros & Cons of Flat Ducting
Easy to flush fit and conceal
Creates more noise within duct run
Great for low-pressure systems
Inappropriate for high-pressure systems
Whether or not you decide to use flat/rectangular or round ducting, there are general guidelines that apply to both when installing ducting within a property.
It is very important that you check the power of the ventilation system you will be installing. The manufacturers will have an advised duct run length that their units can handle, and an experienced installer will be able to tell you how many bends to take into account. Every bend that you add to a duct run adds additional resistance and therefore lowers the overall output of the unit. This also applies to branching off to additional runs. There are calculators available online, however, if you are inexperienced, it may again be more efficient to discuss your system with an installer, or one of our advisors at i-sells.
Fire-rated products are designed for use when a single duct run connects one or more rooms together. They are generally made up of what are known as “intumescent materials”, which rapidly expand when exposed to high temperatures. Fire cuffs or sleeves are designed to be placed around the plastic duct within the void in the wall between joining rooms. The concept is that the high temperatures generated from a fire in one room will cause the fire cuff or sleeve to start rapidly expanding, which then crushes the pipe it sits around, blocking the flow of gasses and flame to the adjacent room.
PVC pipes/tubes and accessories such as Pipe Bends, pipe connectors, couplers, attenuators, grilles, fire-rated products, hose pipe connectors, pipe reducers etc are all available to help you complete your duct run. Grilles come in a multitude of colours and varieties to suit any applications, and i-sells even supply complete kits for cooker hoods, tumble dryers and air conditions, making installation easier than ever.
Please browse the categories on the left to find what you require.
All our plastic ducting and plastic pipe fittings have been produced to provide the lowest air resistance, highest air flow and least pressure drop/leakage.
Plastic ducting comes in round and flat types. Round ducting is better suited for high-pressure installations but is harder to conceal. Flat channel ducting can be flush fit and hidden in voids but is inappropriate for high-pressure systems.