THE MOST POWERFUL VERSIONS OF FILTERS FOR USING IN OFFICE
The most powerful versions of filters, probably better suited to office or workroom use, are the Filtaire 600S, the Enviracaire and the NSA 7100A.
The Filtaire 600S is identical in technical design to the Anatomia Filtaire 300, with fabric and carbon filters. It is larger in capacity and size, more effective and made with a metal casing. It is available at about £400 from Ascot Heath. Filters are of similar cost to the Anatomia and need replacing at similar intervals.
The Enviracaire is round and quite bulky to move. It has a HEPA filter, thick fabric and activated carbon filters. It produces very pure air, but also a draught at ground level, and can be noisy even on low operation. It is priced at £215 (at 1992). Carbon filters need replacing every three to six months at £11 each, and the HEPA filter needs renewing every four to five years at £70.
The NSA 7100A is tall and looks like a piece of office equipment. It has a HEPA filter, plus carbon filters that are thinner than the Enviracaire. It can be manoeuvred easily, being light and on castors. The air it produces is very clean, but the unit itself is made up of a slightly aromatic plastic and can be troublesome to some people with chemical sensitivity. It costs £360 (at 1992). The carbon filters need replacing every six months at £20 each, and the HEPA filter every two years at £60. It is available from Beta-Plus or NSA distributors (addresses below).
All suppliers of devices should offer you a trial period in case a machine does not suit you, or you do not find it effective. Check that you can return a machine before you make a purchase.
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