During the cold season, sunlight streaming directly into the room through skylights increases the heat storage temperature of the floor and walls, reducing the frequency of heating use and achieving passive solar heating. The roof inspection port is made of metal, which is lightweight and has strong load-bearing capacity. Internally and externally painted, the surface is baked at high temperature, with uniform gloss, brightness, and thickness, and is not easily faded. It can not only be used as attic skylights, escape routes, basement exits, emergency entrances, wellheads, cellars, and manholes, but also for home decoration, industry, commerce, schools, and more It can effortlessly push the roof vent access door and also allow the cellar door to hang stably when open, preventing the lid from suddenly falling off This type of roof safety door can not only be used as an attic skylight cover, but also as an escape cover, basement exit cover, emergency passage cover, cellar cover, and manhole cover. The surrounding frame is embedded with sealing strips, effectively blocking rainwater from entering, providing sound insulation, collision prevention, waterproofing, and durability., Manufacturer: WLH Alexanders