Safe metal ducting contains rubber seals while standard metal ducting does not.
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Bathroom zones are just a way of telling which extractor fan you can install in a specific place.
Ductwork: General Ducting Information
The following points should be kept in mind when choosing ducting or planning ventilation systems:
1. The length of ducting and number of bends will effect performance and should therefore be kept to a minimum. 2. Long runs of flexible duct are not recommended for use on cooker hoods. 3. Ducting components have a simple push fit connection. Flat channel can be easily cut to length using a hacksaw. 4. When installing a rectangular to round adaptor, it is important that the flat side is fixed uppermost. The flap operation of a grille/fan would otherwise be obstructed. 5. When installing a circular through-the-wall duct a core drill can be used. 6. Ducts passing through an unheated roof void should be insulated to minimise condensate formation and must include a condensation trap and means of running off condensate. 7. Vertical ducts should be fitted with a condensation trap for low power systems and a weather proof cowl of sufficient free area for the air volume. 8. Horizontal ducts should fall away from the fan unit. 9. Choice of the right system will ensure quiet and efficient operation of fans and or cooker hoods 10. All internal system parts manufactured with self-extinguishing materials to meet fire retardency standard UL94V2 11. Plastic materials do not corrode leading to a clean and long lasting life 12. Wall outlets are made with UV stable materials to delay colour fade 13. The choice of ducting system will depend on a number of factors including: the power of the cooker hood or fan to be connected to, its location, the configuration of the duct run, the space available and others. 14. Ductwork diameters are normally internal diameters - if unsure contact us
For a full list of ducting (including galvanized and stainless steel) or colours please contact our sales line on 08456 44 6001 or to discuss your personal requirements, contact us.
What diameter of round ducting do I need to complement or replace my rectangular ducting?
Click here to work it out.
Plastic Ducting Space Requirements and Dimensions
Actual dimensions (mm)
Space requirements (mm)
For 4" (100mm) extractor fans or for low power cooker hoods Up to 250m³/hour
System 100 - Round
System 100 - Rectangular
110 x 54
116 x 60
For medium extraction rates or if available depth is limited Up to 500m³/hour
System 125 - Rectangular
150 x 70
156 x 76
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
System 204 - Rectangular
204 x 60
210 x 66
System 150 - Round
System 150 - Rectangular
180 x 90
186 x 96
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
System 225 - Rectangular
234 x 29
240 x 35
How do I cut metal spiral ducting?
The best method is to use a jigsaw with a quality blade suited to cutting thin sheet metal.
Mark your pipe in multiple places to provide a cutting guide / line - Drill a small hole to allow you to insert the blade and cut away from you.
Alternatively you can use a hacksaw, but for large ducting or quantities this can be somewhat frustrating. Obviously take suitable safety precautions.
We do offer a cut to size service if you know your measurements and we can ship these ready cut to save you the time and hassle - just let us know quantities / diameter / length etc.
Delivery usually takes 2 - 4 working days. Orders over £100 are delivered free with UK Standard Deliveries
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Need help with your order?
Call us on 020 8463 9696
Further information can be found here.
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