VELUX flat roof window sizes can seem hard to decipher at first. This guide clearly outlines what each code means in terms of sizing and style. For instance, a VELUX CVP 080080 window is 80cm in width and 80cm in height, and has an opening function with a PVC base unit. You can make shopping easier using our VELUX flat roof windows size chart. Here you can see the model number to help you find the right window and price you desire with ease.
Table of contents
It can be difficult to get to grips with VELUX flat roof window sizes. So, using these VELUX roofing size charts can help you find what you need using the model numbers provided.
VELUX flat roof window measurements chart
Click on your desired flat roof window size in the VELUX size chart to be sent directly to the window page to find your ideal product.
Height Width
60cm 80cm 90cm 100cm 120cm 150cm
60cm CFP 060060
CFP 060090
CVP 060060 CVP 060090
80cm CFP 080080
CVP 080080
90cm CFP 090090 CFP 090120
CVP 090090 CVP 090120
100cm CFP 100100
CFP 100150
CVP 100100 CVP 100150
120cm CFP 120120
CVP 120120
150cm CFP 150150
CVP 150150
VELUX flat roof window code chart
Here you will find each VELUX flat roof window code and what it means
VELUX Code Definition First Letter Second Letter Third Letter
CFJ VELUX flat roof dome base unit C = VELUX's classification for flat roof products F = Fixed. Means it is designed not to open or provide ventilation. These are most commonly installed in uninhabited spaces. J = Indicates base unit. Usually paired with domed glazing
CFP VELUX PVC glazed flat roof window, non-opening C = VELUX's classification for flat roof products F = Fixed. Means it is designed not to open or provide ventilation. These are most commonly installed in uninhabited spaces. P = PVC. The base unit is made from PVC and the product contains glazing
CFU VELUX glazed flat roof window, non-opening C = VELUX's classification for flat roof products F = Fixed. Means it is designed not to open or provide ventilation. These are most commonly installed in uninhabited spaces. U = Contains glazing designed for flat or very low-pitched roofs, includes base that isn't made entirely of PVC
CSP VELUX glazed flat roof smoke ventilation windows with electric/automatic opening C = VELUX's classification for flat roof products S = Smoke ventilation/special function. Note the S only stands for this when there is a 'C' as the first letter P = PVC. The base unit is made from PVC and the product contains glazing
CVJ Flat roof window base that opens, designed for roof domes with glazing C = VELUX's classification for flat roof products V = Vented. This window has an opening function J = Indicates base unit. Usually paired with domed glazing
CVP Flat roof windows that have a PVC base, that open electronically and contain glazing C = VELUX's classification for flat roof products V = Vented. This window has an opening function P = PVC. The base unit is made from PVC and the product contains glazing
CVU Flat roof window that opens, containing either double or triple glazing C = VELUX's classification for flat roof products V = Vented. This window has an opening function U = Contains glazing designed for flat or very low-pitched roofs, includes base that isn't made entirely of PVC
CXP A flat roof window with a PVC base designed to provide an access/exit point onto the flat roof C = VELUX's classification for flat roof products X = Exit/Access opening/hatch P = PVC. The base unit is made from PVC and the product contains glazing
ISU Glass top unit for a flat roof window I = Insulating glass/double, triple, quadruple glazing S = Structural top. Note the S stands for something different if the first letter of the code is a 'C' U = In this context, the 'U' just stands for 'unit', but when other letters are involved could indicate something else
LSF Internal lining for flat roof windows L = Lining S = Structural product F = In this context, flat roofs
ZCU VELUX PVC extension kerb for flat roof windows Z = Installation product C = In this context, compatible with VELUX flat roof windows with a CFU or CVU code U = In this context, compatible with VELUX products with a CFU or CVU code
ZIU VELUX mesh insect screen fir flat roof windows Z = Installation product I = Insect screen U = In this context, compatible with VELUX products with a CFU or CVU code
Final thoughts
Now that we’ve broken down these VELUX codes and measurements, the process of finding the right flat roof window for your project has never been easier! Simply refer to this guide whilst shopping and purchase with confidence.
For further advice and information about roof windows or VELUX window sizes, speak to a member of our team on 01752 692 760.
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