White Plastic Ducting Pipe - 125mm diameter x 1000mm (1 metre) length - Please note that our straight lengths of Round plastic 125mm ducting tube are 'female' i.e. round duct fittings such as bends and reducers are 'male' and generally slip inside the duct tube. To connect two 'female' straight duct lengths together use a System 125 Male Connector (Part: "DUCVKC355").
Kair System 125 (SYS-125) Round Ducting provides superior airflow performance when compared with 125mm flexible or 150mm x 70mm rectangular ducting. It is perfect for long duct runs for whole-house ventilation purposes.
|Round Ducting System||1 Metre Length||1.5 Metre Length||Flexible Alternative|
|100mm Round (System 100)||DUCVKC250||DUCVKC299||DUCP0092/102/35|
|125mm Round (System 125)||DUCVKC267||DUCVKC269||DUCP0092/127/35|
|150mm Round (System 150)||DUCVKC670||DUCVKC671||DUCP0092/152/35|
|Rectangular Ducting System||1 Metre Length||1.5 Metre Length||Flexible Alternative|
|110mm x 54mm (System 100)||DUCVKC249||DUCVKC240||DUCR3M/110/55|
|150mm x 70mm (System 125)||DUCVKC604||DUCR3M/150/70|
|180mm x 95mm (System 150)||DUCVKC651||DUCR3M/220/90|
|204mm x 60mm (System 204)||DUCVKC5604||DUCVKC5628||DUCR3M/206/62|
|220mm x 90mm (System 220)||DUCVKC5704||DUCVKC5728|
|234mm x 29mm (System 225)||DUCVKC706|
|310mm x 29mm (System 300)||DUCVKC754|
Looking for Compatible Products?
Compatible with the extensive Kair SYS-125 range of fittings, outlets, and grilles.
The Kair range of plastic ducting is commonly used for the following applications:
|Product Category||Round Pipe|
|Round System (mm)||125|
|Product Group||Plastic Ducting|
|Diameter - Inner (mm)||125|
|Diameter - Outer (mm)||129|
|Socket size (mm)||125|
|Free Area (mm²)||12273|
|Packaged Weight (Kg)||0.9|
|Packaged Length (mm)||1000|
|Packaged Width (mm)||127|
|Packaged Height (mm)||127|
|Temp Max (°C)||60|
|Temp Min (°C)||-15|
|Economy Delivery||Not Eligible|
|Vent Axia (similar)||434715|
|Polypipe / Domus (similar)||1100-5 / 51100|
|Greenwood Airvac (similar)||GD813|
|Pressure Loss (Pa) 15 l/s||0.2|
|Pressure Loss (Pa) 30 l/s||0.7|
|Pressure Loss (Pa) 60 l/s||1.9|
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Is the pipe diameter internal or external? Thanks
Diameter - Inner (125mm)
Diameter - Outer (128mm)
Hi, I am DIY installing this through the outer wall to attach to a kitchen extractor. the outer diameter is 128 mm as stated in the technical specs. However most core drill bits near this size only go up to 127 mm. The next common size up is the 152mm. It seems excessive to drill this and then have alot to fill. What are the other options for the hole?
My new Bosch cookerhood extractor has a 120mm diameter outlet. Will this 125mm ducting fit?
Good morning Michael and thanks for the question.
I have a canopy hood and need to go from round to rectangular on a 90 degree bend as it enters a roof void If I go for a larger size equivalent rectangle flue than 125 will it reduce the efficiency ?
Good morning James and thank you for your question.
|Customers who bought this product also purchased|
|Ducting System||Actual dimensions (mm)||Space requirements (mm)||Airflow mm²|
For 4" (100mm) extractor fans or for low power cooker hoods up to 250m³/hour
|System 100 - Round||100||106||7,854|
|System 100 - Rectangular||110 x 54||116 x 60||5,940|
For medium extraction rates or if available depth is limited up to 500m³/hour
|System 125 - Round||125||131||12,272|
|System 125 - Rectangular||150 x 70||156 x 76||10,500|
For 6" (150mm) extractor fans or for high power cooker hoods up to 500m³/hour & above
|Megaduct 220 - Rectangular||220 x 90||227 x 97||17,968|
|System 204 - Rectangular||204 x 60||210 x 66||12,240|
|System 150 - Round||150||156||17,671|
|System 150 - Rectangular||180 x 90||186 x 96||16,200|
For a shallow space, such as ceiling voids or under floor, where high extraction rates are not needed:
|System 300 - Rectangular||308 x 29||314 x 35||8,932|
|System 225 - Rectangular||234 x 29||240 x 35||6,786|
| System 100 |
| System 125|
| System 150|
|System 204||System 225|
|System 220||System 300|
|Actual Dimensions (mm) Space Requirements (mm)|