The air exchange performance depends mainly on the quality of the ventilation motor. Standard ventilators generally use high-quality ball bearing motors. The average life of the motor is more than 2,000 hours, which is three times the life of an ordinary motor. The motor used by the brand's ventilation fans has five significant features. For example, the surface of the professional ventilation motor is treated with an anodic electrophoresis process, and the structure is totally enclosed and has a waterproof and rust-proof function. The characteristics of ball bearing motors, such as waterproof, rustproof, and non-flowing oil, determine their long service life. Ordinary motors can easily enter the water during use, resulting in rust. Therefore, when purchasing, you must pay attention to the brand, understand the process of buying the ventilation fan motor, and see the design structure. In addition, the size of ventilation fans is also an important indicator to identify the quality of ventilation fans. The principle of the air duct system of the professional ventilating fan adopts the Archimedean spiral air duct, which has the advantages of low power, high air discharge, and low noise. When the ventilating fan is in operation, the air volume can reach 240 cubic meters per hour. Ventilation fan impeller has anti-aging, anti-deformation ability, but also determines the durability of ventilation fan performance. Only the comprehensive motor, ventilation duct design, impeller quality and other factors can select the superior quality ventilation fan. All these depend on professional technical support. Only good brands will have professional technical support. Therefore, it is very important to buy the ventilation fan brand. Product style judgement and choice Ventilation module is square, is to facilitate the installation, the color is not much, common are white, silver, silver and rare blue, can be selected according to their own preferences to match the style of the entire space. Product cost and brand knowledge Common brands are: Aopu, AIA, Ying Knight, Yang Pa, Frinks, character, Mess, the price is between 500-800 yuan. There are also many prices on the Internet between 100-300 yuan. Ceiling integrated ceiling integrated ceiling electrical space Glass Fridge Magnet,Rubber Fridge Magnet,Custom Fridge Magnets Yongze Magnet Co., Ltd. , http://www.nb-magnets.com