Reason 1: The angle of the smoke exhaust pipe affects the smoke exhaust effect. The angle of the smoke exhaust pipe should be slightly inclined upward (one end of the flue interface is high, and the other end of the range hood is low), because the temperature of kitchen lampblack and water vapor is high, and the upward diffusion flows, especially the initial speed of lampblack generation is extremely high. What should I do if the smoke exhaust effect of the range hood is not good? The angle of the smoke exhaust pipe is slightly inclined upward, which is beneficial to the discharge of kitchen fumes and water vapor. Generally speaking, the greater the air volume, the more quickly and timely a large number of kitchen fumes can be sucked out and discharged. The greater the wind pressure, the stronger the anti-suction ability of the range hood. Reason 2: The length of the smoke exhaust pipe affects the smoke exhaust effect. Reason 3: The installation height of the range hood affects the smoke exhaust effect. The installation height of the range hood generally depends on the site conditions, and its lower edge is generally 6 10-750mm away from the counter. However, practice has proved that the lower edge of the range hood is 6 10mm away from the cabinet table, instead of 750mm away from the cabinet table.