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| low-velocity filter (with such filter area the air velocity across the filters should not exceed 106.68 m /min and 167.64 m /min for high-velocity filters akimboesenko) | |||
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| low-velocity filter (with such filter area the air velocity across the filters should not exceed 106.68 m /min and 167.64 m /min for high-velocity filters akimboesenko) | |||