How do I choose the right model for my windows?

Our models are categorized with different length. The maximum length of coverage is marked in the model, so you just need to measure the width of coverage for your windows (if the curtain weight is no more than 25 kg). As there is both ends attached to the tracks, the real coverage is 0.1 meter longer than the marked length. For example, HT100-3m is suitable for windows up to 3.1 meters; while HT100-5m is up to 5.1 meters.