The table below gives an overview of recommended minimum and maximum secondary glazed unit sizes.
Understanding Secondary Glazing Sizes: A Comprehensive Guide
Unit production viability is subject to Width x Hight x Panel Size x Glass Weight ratios (& spring size availability with Vertical Sliders)
If the online quote system will not calculate a quote, it will advise if the unit is too big x small or a panel is to large, this will either confirm the size is not possible or automatically upgrade the glass to a viable option, if it just won’t calculate, you will need to change the specification. See Why Won’t My Quote Calculate.
NOTE: The Maximum sizes are based on the maximum individual span in width or height, not combined. The weight will determine if the panel size can be produced. i.e. if the maximum size detailed for a unit is 4900 x 2700, if using an 8.8mm glass, you may be able to have the width at 4900, but not the height at 2700 and vice versa in height and width.
Units will be supplied fully assembled and pre-glazed as standard, unless, both the unit width and height are both over 1800mm these units will be supplied flat packed. Units can be supplied flat-packed on request, there is a surcharge for this option.