The new series of EPAL frames has innovative design using double thermal break, which is a combination of a cast thermal break and a polyamide thermal break, thus lowering further the U-value. The thermal-insulating glass panes used with the EPAL 18000 Ultra K series can be double, triple (with two gaps), or quadruple (with three gaps). The profiles have straight lines and are equipped with the German window hardware system ROTO NT manufactured by ROTO. They can be painted in two colour combination (Different colour inside and out).