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Of the higher efficiency filters, two medium-size ones receive very positive reports, the Biotech 500 and the Anatomia Filtaire 300.
The Biotech 500 is an oblong, desktop device – compact and light, more portable than the Anatomia Filtaire 300. It has an electrostatic filter, and a thicker carbon layer than the smaller devices. It has an optional ioniser, which is useful if you want the possibility but do not want one in operation the whole time. It is very quiet in operation, with no vibration, and its hard plastic case does not give off fumes. It is noticeably effective on particles and good on chemicals. It makes a very real difference to air quality. It is large enough to clean the air effectively in a large bedroom or living room. Prices are quoted at between £110 and £135 (1992), with replacement filters costing £8, renewable every six months. It is available from Air Improvement Centre or The Healthy House. The Anatomia Filtaire 300 is made of a plastic casing which does not give off fumes once aired well. It is circular, about 30 cm (12 inches) in diameter and 23 cm (9 inches) in height. It draws in the air through round, revolving thick fabric filters, and pushes it out into the room through a thick wad of activated carbon. It has two speeds of operation. It is extremely effective for its size and price, and receives consistently the best reports for removing both particles and chemicals. Some people find it very noisy and do not like to run it if they are in same room. The noise is probably more subdued than a fan heater, but louder in volume. This device is more bulky and heavier than the Biotech 500, or the smaller filters, but is still readily portable by car, or in a strong bag.
The fabric filters need vacuuming and washing once every two to three months, unless you are very sensitive, when you should wash them as often as you need. The fabric filters need replacing every nine to twelve months and cost £7. The carbon filter needs replacing every eighteen months to two years and costs £18.
The Anatomia Filtaire 300 is priced at between £155 and £165, available from Ascot Heath, The Healthy House and Patent Filtration.
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