The utility model relates to a laboratory, in particular to filtration dust removal laboratory has solved laboratory safety and has admitted air and carminative problem, including the laboratory, thelaboratory in be equipped with filtration flow and go into the imported filter equipment of laboratory air and the export filter equipment of filtration flow play laboratory air, imported filter equipment at least including first chimney filter, second chimney filter, third chimney filter and fourth chimney filter, the activity assembly in proper order of first chimney filter, second chimney filter, third chimney filter and fourth chimney filter, the second chimney filter in be equipped with the na2CO3 filter core, the third chimney filter in be equipped with naOH solution, imported filter equipment lean on indoor one side opening part to be equipped with CO2 sensor, simple structure conveniently replaces the filter core, has safe admitting air and carminative function simultaneously, economic cost low accords with the standard specification in modern laboratory.