For explosion-proof centrifugal fans, customers often ask: what does the explosion-proof rating "BT4" actually mean?
Time:Dec 25th, 2025
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The constitute of an explosion-proof centrifugal fan is actually quite simple: it's a combination of "explosion-proof type + temperature group + explosion-proof rating," with BT4 being a common designation.
"B" represents the explosion-proof rating, a common rating for explosion-proof fans used in factories, capable of withstanding certain concentrations of flammable and explosive gases.
"T4" represents the temperature group, indicating that the fan's surface temperature will not exceed 135℃ during operation, suitable for scenarios where flammable and explosive gases have high ignition temperatures.
Besides BT4, there are higher-rated explosion-proof fans such as CT4, which can withstand even more dangerous explosive environments.
When selecting an explosion-proof fan, the appropriate rating must be matched to the explosion hazard level of the operating environment.
