Air curtain machines are powerful air streams generated by high-speed motors driving through-flow or centrifugal fans, creating an invisible curtain that divides indoor and outdoor spaces into two separate temperature zones. This indoor environment invention maintains air conditioning and air purification functions, saving electricity while facilitating air circulation. It effectively isolates dust, smoke, odors, insects, and microorganisms, preventing the escape of cold (or warm) air and conserving energy. It continuously forms an air door that effectively prevents the leakage of cold (or warm) air, saving electricity, and divides the indoor and outdoor areas into two independent temperature zones. During prolonged operation of air conditioners, it assists in temperature circulation and regulation, achieving the goal of energy conservation and environmental improvement. The dust and insect-proof function of the air curtain machine generates high-speed air streams, forming a protective barrier that effectively blocks outdoor dust and flying insects from entering, keeping the indoor environment clean. The smoke and harmful gas-proof function of the air curtain machine's air circulation system prevents the spread of cooking oil smoke, spicy odors, industrial waste gases, and vehicle exhausts from entering the indoor space.

Air curtain systems' air circulation function achieves indoor temperature equilibrium in spaces like gymnasiums, cinemas, and entertainment venues where air conditioning energy distribution is uneven due to their large size. If the heater operates continuously in this environment, the PTC ceramic plates will frequently turn on and off, thereby diminishing their functionality. Additionally, the PTC ceramic plates will age faster on the surface due to overheating, which means consuming electricity without receiving an equivalent amount of heat.

Continuously operating without heating can lead to the consequence of consuming electricity without generating heat. Although thermal air curtains typically do not have air filters, there are many floating dust particles in the air that can enter the surface of the heater within the thermal air curtain during operation. The longer the thermal air curtain is used, the thicker the accumulation of dust particles on the heater's surface becomes, which can affect the cooling speed of the PTC ceramic sheet (the heater's cooling speed), increase the overall temperature of the thermal air curtain body, and also impact the stability of the fan, as well as the lifespan of the heater. Semiconductor thermosensitive ceramic heater: quick heating, low thermal resistance, high heat conversion rate, no open flame, wide voltage range, and working temperature not exceeding 45°C. Finned electric heater: high thermal inertia, stable heating power, does not block air flow channels, wide heating range, long lifespan.