1. Application field: CAD fire smoke exhaust is applied to the interior of buildings, with the purpose of maintaining the availability of evacuation passages and providing a safe escape route by removing smoke and hot air when a fire occurs, while smoke exhaust is applied to commercial kitchens or restaurants to effectively eliminate smoke and odor and keep indoor air clean.

2. The principle and design requirements are different: CAD fire smoke exhaust system adopts mechanical smoke exhaust, and uses fans and air duct equipment to exhaust smoke and hot air to maintain the safety and ventilation inside the building, while the oil smoke exhaust system adopts oil smoke filtration and purification equipment to prevent oil smoke and odor from spreading into the indoor air.