What is the smoke exhaust design specification for hotel kitchens?

The pipeline layout of hotel kitchen should follow the principle of "shortest" and use fewer elbows, especially large-angle elbows. This kind of pipe arrangement is different from the "neat horizontal and vertical" of air conditioning, aiming at ensuring the effect of oil fume exhaust and saving investment. The central position of the hood is preferably used for the main outlet of the gas collector above the hood.

Mufflers are provided where fresh air pipes and exhaust pipes pass through the partition wall of the room. The exhaust pipe in the kitchen should try to avoid the horizontal pipe being too long, otherwise it will not be conducive to the rapid exhaust of flue gas and affect the exhaust effect. Generally, the farthest distance of the exhaust pipe shall not exceed 15m. The horizontal pipeline should have a slope of more than 2%, the smoke exhaust hood should be installed in the slope direction, and the oil collecting tank should be set at the lower part of the pipeline. The kitchen should take measures to prevent the mechanical or natural vertical exhaust pipe from flowing back. The two ends of the horizontal pipe are connected with movable flanges to clean up the oil pollution.

In principle, it is not allowed to discharge lampblack into underground sewage or drainage wells, which has a poor effect and is not allowed from the aspects of health and safety.

The main air inlet and smoke outlet of the kitchen should be set separately to prevent short circuit, and the air inlet should be more than 2m away from the outdoor natural ground. If the air inlet and the air outlet are on the same floor, facing the same direction and approaching, then the air inlet must be lower than the air outlet. Exhaust gas flows in different directions should not flow back to the air inlet. When the height of the building where the kitchen is located is less than or equal to 15m, the oil fume outlet should be higher than the roof [130], and in principle it should be more than 2m higher than the building [131]. When the building height is greater than 15m, the oil fume outlet height should be greater than 15m[ 130]. The outdoor outlet of the exhaust pipe should be equipped with a finished pipe cap (pipe sleeve) which is less affected by outdoor wind pressure.