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. Maximum working temperature for rigid PVC duct is 60^oC

For a full list of ducting (including galvanized and stainless steel) or colours please contact our sales line on 08451 66 20 40 or to discuss your personal requirements, email us by clicking here.

Ducting System  Actual dimensions (mm) Space requirements (mm)  Airflow mm²  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 For 6" (150mm) extractor fans or for high power cooker hoods   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 medium extraction rates or if available depth is limited   System 125 - Round  125  131 12,272  System 125 - Rectangular 150 x 70 156 x 76 10,500  For 4" (100mm) extractor fans or for low power cooker hoods   System 100 - Round  100 106  7,854  System 100 - Rectangular  110 x 54  116 x 60  5,940