Each door is custom-made to your size and requirements. Thermally Broken for excellent thermal and acoustic performance Industry leading color options. Anodized, Powder Coat, Wood Grain all available or combine two tone finishes are available. You expect your bifold doors to slide effortlessly from the day one. But you also want them to be equally effortless 10 years later. The stresses on a bifold door are considerable — and only doors engineered to such a high standard will last the distance. Topbright doors are tested to 20,000 cycles — the equivalent to opening twice a day, every day for 27 years!