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Explosion-proof fans are ventilation equipment specially designed for environments with flammable and explosive gases or dust. Their core principle lies in eliminating the possibility of generating sparks during operation through structural optimization and material selection. 1. Safety value manifestation In high-risk industries such as chemical engineering and coal mining, explosion-proof fans can remove dangerous gases like methane and hydrogen, preventing explosion accidents. For instance, ExdIICT4 grade fans are used in underground coal mines, which can withstand environments with methane concentrations ranging from 5% to 15%. 2. Differences from ordinary fans Apart from the motor differences, explosion-proof fans have a lower limit requirement for the impeller clearance (usually ≥1.5mm), while ordinary fans pursue a tight clearance to improve efficiency. The two form a contradiction.
