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The basic unit does not have filters in it. However, a filter frame accessory is offered that will allow filters to be installed within the unit. Otherwise a filter rack must be installed by the installer in the duct work. Affix the filter label supplied with the unit adjacent to the filter area. TABLE 4 UNIT NOMINAL CFM FILTER* Sq.Ft.- SIZE FILTER RESISTANCE YCZ036F 1200 4 0.05 YCZ050F 1600 5.33 0.05 YCZ060F 2000 6.67 0.05 *Filters must be installed in the return air system. The above square fo