(1) Natural’s Filter Fans all adapt new UL listed materials. Never adapt used material, some company adapt used material, for this, it is very easy, you just use fire to fire it, then smell, if it is smelly, this means the material is used material, another, to check the color of the products, used material color is dark and sometimes with black point on the products. For the ones that adapt used material, after some time, when you press the cover of the filter, it will break, for ours, not break. Because used material feature is not so stable as new material, will get aging fastly.

(2) Natural’s Filter not add CACO3 material into product, CACO3 will make the material harder than normal, but it will reduce the using life of the filter fans, get aging fastly, Natural’s filter fans not add this kind of material, so will have longer using life.

(3) Natural Filter Fans inside adapt copper wire, not adapt aluminum wire or painting copper wire, Natural’s copper wire diameter is 1.1mm, not 0.8mm. Maybe you will ask how to check if the wire is copper or aluminum? Fire it, if the fired place easy to fall down, means the wire is aluminum, if not fall down, just bend, which means is copper.

(4) Natural’s fans have 32 floor Silicon steel sheet, not 28 floor or 26 floor, for this, you can open the fans and check inside the floor of the Silicon steel sheet, you will know the difference.