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Tunnel belongs to a semi-closed place, vehicles travel, dust is especially much, and the ventilation is relatively bad, the environment is relatively not very good, to improve the tunnel's ventilation, requires tunnel installation using high temperature characteristics: high temperature resistance performance good, high efficiency. Tunnel belongs to a semi-closed place, vehicles travel, dust is especially much, and the ventilation is relatively bad, the environment is relatively not very good, to improve the tunnel's ventilation, requires tunnel installation using high temperature characteristics: high temperature resistance performance good, high efficiency.