Bottom door seal brushITEM NO.:SeriesT(mm)S(mm)L1(mm)BH(mm)Brush Section Size(Width X Height)Alh3535Aluminium Holder + Strip brush6.07.016.015-253.5 x 3.5Alh5050Aluminium Holder + Strip brush8.09.025.015-255.0 x 5.0Alh3636Aluminium Holder + Strip brush6.16.322.715-253.6 x 3.6Alh3640Aluminium Holder + Strip brush6.07.022.515-253.6 x 4.0Dust Control Since neither light nor air can get through a door sealed with brush,Website:http://www.changweibrush.com, dust does not enter your building. Whether on a door to a room or an enclosure used to protect contents, brush seals, when installed properly, block outside dust incursion. Protect buildings, clean rooms, computer rooms, machinery, and filtration systems from the ravages of dirt and dust particles.? Temperature Control Brush seals are a great barrier to heat and cold and therefore serve as a perfect temperature control. Even a small gap around a door can affect the temperature inside a room. ......url:http://www.changweibrush.com