The effect of infrared rays on human skin is different and depends on the wavelength of infrared rays. The chart shows that far wave infrared (IR-C) rays penetrate the human skin the least and only touch the outer epidermis. This is completely enough to create a comfortable heating, avoiding any health or safety issues/disorders.

Medium wave infrared (IR-B) rays penetrates into the deeper layers of the epidermis and reaches the upper dermis but, like far-field IR waves, does not "touch" any of the functional organs (sweat glands, nerves and etc.).

Short wave infrared (IR-A) rays can reach the subcutaneous fat layer, muscle layers, penetrate the dermis and thus warm the hair follicles, nerves, sweat glands and muscles.

Therefore, short wave infrared IR-A rays are used in medicine - the effect of penetrating the skin, used to stimulate the organs there (all conditions are controlled). Employees installing infrared heaters should be aware that short wave infrared heat generates extremely high temperatures (1000 ° C and above), so prolonged exposure to such heaters can cause certain skin and eye damage. Short wave infrared rays are identified with the concepts of "hot overhead," "dry eyes," and "head pain." This is because some vendors/installers install these systems in the wrong places (for example, in homes where heaters are too close to people) for their own benefit. Therefore, short wave heaters are widely used in various industrial processes or space heating in large indoor and oudoor areas.

For heating of fesidential, commercial and etc. premises it is recommended to install heaters that emit medium and far wave infrared rays.