Skylight Inner Dome for a 22" x 14" Skylight opening. The smallest skylight opening it will fit is 21 1/2" x 13 1/2". An Inner Dome provides a layer of insulation and reduces condensation forming on the outer skylight. Molded of white ABS plastic material with a clear center insert. Complete your replacement with a new outer dome, SL1422. When paired with an ICON SL1422 oute...