The fan for an air purifier is important since it circulates the air through the purifier, and the machine can't work effectively without it. The fan blades and motors are often sold separately, so it's best to determine which of the two parts is malfunctioning before replacing them both. A classic XL fan blade has an MSRP of $17 as of November 2010, while most fan motors cost $60.
The ultraviolet (UV) light in the Ecoquest functions as a sterilizer of sorts. It destroys bacteria, viruses, fungi, and yeast, while reducing or preventing mold. UV lights cost $65 each MSRP, as of November 2010.
Most Ecoquest purifiers use HEPA (high efficiency particulate absorbing) filters for good reason. HEPA filters efficiently remove 99.97% of airborne particles. The diameter of the fiberglass mats, as well as the thickness of the fibers in the filter, change the filter's effectiveness.
The fuse is another key component, and if it's faulty, the purifier will not receive power. Most purifier models require a 1 AMP 250V Fast Acting Fuse, but a few Fresh Airs take a 1.5 AMP 250V Fast Acting one. Finding fuses is easier than locating other parts; check an area hardware store. Fuse holders are also relatively easy to locate, and a universal holder will fit in any model.
Even though many purifiers use HEPA filters, there are those that don't. The common filter is the charcoal, metal mesh, or lint variety. All have the same general function of cleaning air, but these aren't as specialized as HEPA ones. Filters can often cost anywhere from $45 to $57 as of November, 2010.
Other parts may need replacing, too. The power cord for EcoQuests are found online, as are the "feet" of the unit--or little squares on the bottom that raise it up minimally. Screws that fall out are also at the hardware store.