To complete the complete ventilation of the ventilation duct, there is no harm in deceiving mechanical ventilation or deceiving ventilation to complete it. According to the differences in system characteristics, overall ventilation can be divided into three categories: overall air supply, overall exhaust, and overall air supply and exhaust. According to the differences in effectiveness mechanisms, overall ventilation can be divided into two categories: dilution ventilation and displacement ventilation. So what are the mechanical ventilation guidelines for ventilation ducts?

1、稀釋通風

1. Dilution ventilation

稀釋通風又稱攙雜通風，即送人比室內污染物濃度低的空氣與室內空氣攙雜，以此下降室內污染物的濃度，抵達衛生標難。

Dilution ventilation, also known as mixed ventilation, refers to the mixing of air with a lower concentration of indoor pollutants, in order to reduce the concentration of indoor pollutants and achieve hygiene standards.

2、置換通風

2. Displacement ventilation

在置換通風體系中，鮮美冷空氣由房間底部以很低的速度送入，送風溫差僅為2—4Y。送入的鮮美空氣因密度大而像水相同彌散悉數房間的底部，熱源導致的熱對流氣流使室內發生筆直的溫度禪度，氣流遲緩上升，脫節作業區，將余熱和污染物推向房間頂部，由設在頂棚上或房間頂部的排風口直接掃除。

In the displacement ventilation system, fresh and cold air is fed in at a very low speed from the bottom of the room, with a temperature difference of only 2-4Y for the supply air. The fresh air sent in is as dense as water and diffuses at the bottom of all rooms. The heat generated by the heat source causes a direct temperature rise in the room, causing the airflow to slowly rise and detach from the working area, pushing waste heat and pollutants towards the top of the room, which is directly swept away by the exhaust vents located on the ceiling or at the top of the room.

室內空氣近似活塞狀活動，使污染物隨空氣活動從房間頂部掃除，作業區根本處于送入空氣中，即作業區污染物濃度約等于送人空氣的濃度，這是置換通風與傳統的稀釋全盤通風的很大別離。在通風管道中，顯著置換通風的通風成效比稀釋通風要好。

The indoor air moves in a piston like manner, allowing pollutants to be swept away from the top of the room with the movement of the air. The working area is fundamentally in the incoming air, which means that the concentration of pollutants in the working area is approximately equal to the concentration of the incoming air. This is a significant difference between displacement ventilation and traditional dilution ventilation. In ventilation ducts, the ventilation effect of significant displacement ventilation is better than that of dilution ventilation.

3、片面通風

3. One-sided ventilation

片面通風便是欺詐片面氣流，使片面當地不受有害物的污染，構成優異的空氣環境。

One sided ventilation is the act of deceiving one sided airflow, preventing local pollution from harmful substances and creating an excellent air environment.

片面通風體系分為片面送風和片面排風兩大類。片面排風是將污染物當場捕集、凈化后排放至室外。片面送風是將始末處理的、契合要求的空氣送到片面作業當地，以確保片面區域的空氣條件。片面通風辦法作為確保作業和生計環境空氣品性、防備室內環境污染的技藝對策應優先研究。

The one-sided ventilation system is divided into two categories: one-sided air supply and one-sided exhaust. One sided ventilation is the process of capturing and purifying pollutants on the spot before discharging them outdoors. One sided air supply is the process of delivering air that meets the requirements from the beginning to the end to the area where one sided operations are carried out, in order to ensure the air conditions in the area. The one-sided ventilation method should be prioritized as a technical countermeasure to ensure the air quality of the work and livelihood environment and prevent indoor environmental pollution.

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