if you mean in the crosstabs then sort of...a crosstab doesn't really have a filter but you can at least limit the number of rows.
create a new formula
if {OBI_EquipmentMaster.EquipmentType} = 3
then {OBI_EquipmentMaster.Description}
now right click on the crosstab row header (desc field) and choose Row Options > Group Options...change the current desc field to your new formula.
note that you will get a blank line added to your xtab...nothing you can do about this as. this is what i mean by the crosstab not having a filter.