Once you have taken your window measurements for each window, determine how many bars each window needs with the following formula:
Window Drop (height in mm) - 120 / 150 = number of bars needed
Then round that figure up or down to the nearest whole number & you have the number of bars you require.
Window measurements are 800mm (high) x 400mm (wide)
800mm-120mm = 680mm
680 / 150 = 4.53
4.53 rounded up is
5 bars of 400mm length! Simple, huh?
Note: because safety standards maintain that you need a maximum space of 120mm between burglar bars, it's always safest to round UP. Sometimes, however, this may not be practical - consult us via telephone or e-mail if you are unsure.
InvisiBars™ DIY are sold in 3m strips. To avoid wastage, send us your cut list (or measurements) and we'll determine how many bars you can cut from each 3m strip.