The primary principle for selecting ventilators is that the selected model and installation quantity should meet the ventilation requirements of the room, which not only satisfies the fresh air demand of the people in the room.


Ventilators of different models and structural methods have different technical indicators such as ventilation volume, wind and rain resistance, and noise reduction coefficient. They should be selected according to the specific situation and requirements of each building to achieve their intended use and meet the design standards of the building.

1. When choosing the model and installation quantity of ventilators, consideration should be given to the comprehensive factors of the building itself.

Firstly, it is necessary to consider the climatic conditions of the location where the building is located, such as the basic wind pressure value and temperature conditions. The ventilation volume obtained by different wind pressure values on the same type and length of ventilator is different. Can the wind and rain resistance performance indicators of the selected ventilator meet the requirements. In terms of temperature, it is necessary to consider whether it is in a cold region, that is, whether the model of ventilator can adapt to use and achieve non condensation in cold seasons.

Secondly, it is necessary to consider the environmental conditions, building use, and usage requirements of the building. If there are other buildings surrounding the building that obstruct it, causing a decrease in wind pressure, it is necessary to choose a model with higher ventilation or increase the number of installations. Is the building located in a high noise area (such as an airport or highway)? The building is intended for use as a hospital, school, etc. and requires special noise reduction requirements. Can the noise reduction indicators of ordinary models meet the requirements for use, and is it necessary to use sound-absorbing ventilators (because the higher the noise reduction coefficient, the smaller the relative ventilation volume obtained).

Again, it is necessary to consider other factors of the building itself, such as building height, room use and area, number of people, structure of doors and windows, and the length and quantity of ventilation systems that can be installed.
　　


The higher the building, the greater the wind pressure value, and the room in the location also receives more ventilation. The requirements for fresh air volume vary depending on the purpose and number of people in a room. For example, the more pollution sources and people in a room, the greater the amount of fresh air needed. The length and quantity of installed ventilators for the already designed door and window structure should be considered based on the installation position and length of the door and window structure.

2. The model and installation quantity of ventilators should meet people's requirements for fresh air volume.

Each type of ventilator has its fixed ventilation area and obtains different ventilation rates under different air pressure differentials. Therefore, the most basic wind pressure coefficient (2Pa) should be used as the parameter for calculating ventilation rates in order to obtain the required ventilation rate under low wind pressure conditions.

Based on the factors and conditions of the building itself, combined with the ventilation data of different types of ventilators, first calculate the ventilation demand of the installed ventilator room, and then calculate the selected ventilator model according to the length of the doors and windows that can be installed with ventilators, that is, whether the selected ventilator model number and installation length can meet the ventilation demand of the room.

3. Calculate and select the ventilation model

Example: The living room has an area of 25m2 and requires a minimum ventilation rate of 75m3/h and a maximum ventilation rate of 150m3/h

The required ventilation rate for this room is 25m2 × 3.6m3/h/m2=90m3/h

Dimensions for installing different models of ventilators

(A) THV-90 (ventilation rate 107m3/h/m):

90m3/h ÷ 107m3/h/m=0.84m

(B) THK-90 (ventilation rate 603/h/m):

90m3/h ÷ 60m3/h/m=1.5m

Note: It is recommended to choose models with high airflow or slightly increase the installation length to avoid insufficient ventilation, especially in areas and environments with low wind pressure values.

4. Refer to other performance data and installation methods of the ventilator

After selecting the ventilation volume, it is also necessary to refer to other performance data of the ventilator to see if its technical indicators meet the technical indicators of doors, windows or curtain walls (such as weather resistance, insulation coefficient, sound insulation coefficient, strength, etc.).