Wavelength dependence of the effective extinction curves for three viewing directions: edge-on (black), intermediate (blue) and face-on (red) of AGN models as described in the text. The effective extinction curves of the AGN model computed with fluffy grains are shown as full line and for disk-only models as dashed lines, that of ISM dust as dotted lines. The extinction curve (thick gray) derived from the cross section of the fluffy grains is given for reference. All curves are normalized to the V band.