by the filter provided between a front portion of the drum and the circulation duct such air flow can be performed by a fan not shown provided in the circulation duct more efficiently meanwhile a heat exchanger for heat exchanging with air circulating the circulation duct may be provided in the clothes drying machine the heat exchanger heat exchanges with the circulating air and absorbs heat from the high temperature humid air after that the air condenses and removes the moisture contained in the high temperature humid air the dry air having the moisture removed there from is re heated by the heat exchanger or a heater to become a high temperature dry air the high temperature dry air is re supplied to the drum 6 along the circulation duct referring to fig2 a filter guide having a latch device for a filter cover and the clothes drying device using the filter guide will be described in detail as follows fig2 is an exploded perspective view illustrating a coupling state of the filter guide referring to fig2 the drying machine according to one implementation may include a filter guide 30 having a filter assembly 70 configured to filter foreign substances contained in the air exhausted from the drum 6 the filer guide 30 can define a conduit that receives at least a portion of the filter assembly the filter guide 30 can be a member that forms a filter entrance 6 configured to insert the filter assembly 70 see fig8 therein and the filter guide is provided under the opening 5.