A conical filter device inserts into a duct having flow passing from upstream to downstream. The filter device includes fluted filter media (62) having flutes formed therein and a housing (54). The filter forms a seal (59) between the outer edge of the filter at the downstream side and the housing. The upstream face of the filter is conical-shaped in a first embodiment and frusto-conical in a second embodiment with the housing roughly corresponding to the shape of the filter. The filter elements (62) are formed by winding layers of filter media to form a circular cross-section. The elements are moved axially as they are wound or placed on a shaping form while the sealant is still piable to shape the element.
