Surround Air XJ-3000 Spare Filter
From Surround Air

HEPA air filters are made from very tiny glass fibers that are made into a tightly woven paper. This creates a filter consisting of a multitude of very small sieves that can capture extremely small particles, including some biological agents. Once trapped, contaminates and particles are not able to flow back into circulation, due to the highly absorbent pores of the HEPA air filter. HEPA air filters are largely considered the most effective type of air filter for solid particles, such as dust and other allergens. HEPA air filters remove 99.97% of particles down to 0.3 microns in size, almost 300 times smaller than the width of a human hair. The Atomic Energy Commission developed HEPA air filters during the Second World War. They were originally designed to remove radioactive dust from their plants. The U.S. Dept. of Homeland Security recommends HEPA air filters. HEPA air filters are effective for solid and liquid particles, but not effective for gaseous particles. The XJ-3000C HEPA & ionic air purifier incorporates other technologies that are effective against gaseous particles, such as ionization and activated carbon filtration.

Amazon Sales Rank: #29933 in Health and Beauty
Brand: Surround Air
Model: XJ-3000SF
Released on: 2006-10-27
Dimensions: 4.00" h x 6.00" w x 11.00" l,

GREAT PRICE
Very good system received the 3 units 3 years ago - just hate the cost of the filters but good price on amazon.

Good product
I really don't have much to say about a filter replacement. As these things go, this one is very good. It's sturdy and easy to use. It holds up well and lasts as long as the manufacturer says, even in a household with pets. The size makes it easy to store too. They aren't cheap, but I don't have to buy them too often, and it's worth it for the level of air quality they produce.

Works like a little champ!
The filters for this machine work really well. The machine itself is quiet, and deoderizes a small room within minutes.