Rough opening dimensions of this skylight are 18"x 30". Flange to flange dimensions are 21" x 33". Skylights are made of high performance thermoformed polycarbonate to be long lasting and easy to clean. Skylights include care instructions. Skylights include a 10.3 oz tube of approved urethane sealant that must be used with installing. Sizes available to replace most original equipment. Inners white obscure (no window) or a clear window dome. When choosing a Skylight, measure your rough hole opening as well as the overall exterior size. Purchase exterior Skylight and inner garnish separately.
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