Product details:

Rough opening dimensions of this skylight are 22 inchx 22 inch. Flange to flange dimensions are 25 inch x 25 inch. 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.