When a ViiFire Unit is face fixed around the reveal, consideration has to be given to the overall unit size being greater than the clear opening size required. This is to the effect of 190mm in height and 170mm in width.
When the ViiFire Unit is fitted within the reveal, consideration has to be given that the overall unit size becomes the clear opening size. Therefore the resultant clear opening size arrived at after installation is reduced by 170mm in width and160mm in height.
