We all know that a significant reason for the hot indoor air quality is the stagnant and non circulating indoor air quality. We all know that although fans cannot change the temperature in the air, they can use weak stirring air convection to make people feel cool. In the middle passage of two types of houses, if in the presence of wind, it must be cooler than in a closed industrial workshop where gas does not flow. In fact, negative pressure fans use negative pressure ventilation and air circulation to construct a "cross ventilation" physical system in order to achieve the cooling effect of the workshop.

The negative pressure fan adopts a CAD/CAM design scheme, which has the advantages of low investment cost, large exhaust air volume, low noise, low energy consumption, stable operation, long service life, high efficiency, etc. The blind curtains are fully automatic to prevent pollution, moisture, and have a unique style; It can be used as both a hair dryer and exhaust, making it the best choice for intelligent workshop temperature reduction and natural ventilation. Environmental protection, environmentally friendly negative pressure fans or mainstream cooling systems for factory buildings. Regarding the purchase of negative pressure fans, if an industrial workshop must purchase negative pressure fans, how to budget the total number of multiple negative pressure fans for the application? The corresponding calculation can be based on a formula: number of centrifugal fans=(indoor space volume/air volume per unit) × The frequency of air changes per hour.

The Air changes per hour of the negative pressure fan can also be selected according to the environmental conditions. Generally, 25-30 air changes per hour are required in the environment, 30-40 air changes per hour are required in public places, 40-50 air changes per hour are required in the environmental conditions with certain temperature or dirt (smoke, smell), and about 60 air changes per hour are required in the environmental conditions with continuous high temperature or serious environmental pollution.