1. How do I calculate my drawer box size for Blum under mount slides?
Answer: The width of your drawer box is equal to the inside width of your cabinet less 3/8 inch or 10mm. This will be the outside width of your drawer.
When notching front and back, the depth of your drawer box is equal to your drawer slide length(nominal length) less 3/8 inch or 10mm.
Example: Blum drawer slide 5oomm -notch front and back drawer depth is 500 – 10mm or 490mm(19 11/16 – 3/8 0r 19 5/16 inches)
If you are not attaching a drawer front and having scoops on your drawer, or prefer notches in the back only, then add 1/4 inch or 6mm to the drawer slide length(nominal length)
Example: Blum slide 500mm- notch back only 500 + 6mm or 506mm(19 11/16 + 1/4=19 15/16)