The sidewall grating tuyere is a tuyere with fixed inclined blades, as shown in Figure 3. It is often used for the return air outlet on the side wall, the air vent on the outside wall of storerooms and warehouses, and the fresh air intake in the ventilation and air conditioning system. When used for fresh air intake, if necessary, it can also be installed with single (or double) aluminum plate net or non-woven filter layer to pre-filter fresh air.