An open hood is a hood that can be quickly opened and closed. The hood is equipped with customized accessories that can be quickly opened and closed, allowing on-site inspection personnel to quickly open or disassemble the hood for inspection, maintenance, and replacement of parts. The material of the open hood can be selected as galvanized steel plate, color coated steel plate, stainless steel plate, aluminum magnesium manganese plate, fiberglass steel plate, PC endurance plate, etc. Different materials will be used in different working conditions, and can be selected according to the customer's on-site environment and needs. The opening methods of the open hood include: rotating from one side to the other, optional opening from both sides to the other side, and direct disassembly from both sides, which can be selected according to customer needs. The layout ratio of open hood and fixed hood is generally 1:1, 1:3, 1:5, 1:7, 1:9, 1:20, etc., which can be selected according to the customer's on-site environment and needs.