Ambient Air Filters
Microclene & Thor Filtration

The elimination of ambient dust is a further step in the three-point strategy to avoid the problems caused by inhaled dust in the woodworking workshop.  Despite any dust extraction we may use, there will always be residual dust in the atmosphere and it is the removal of this dust which is addressed by the well-proven, quiet, very efficient  and effective Ambient Air Filters which cost a few pence per day to run and typically filter to 0.4 micron .  Having used such a device in my own workshop for many years I can attest to the great improvement these filters make in the working environment.

For many years we have been happy to supply the Microclene units but these have now become unavailable.

We have been able to source replacement filters and media with similar sizes and specifications from another British company, Thor Filtration,  and we are pleased to be able to offer these and thus to break the hiatus in availability of quality ambient air filters.

Through our relationship with Thor Filtration we are now also able to offer continuity of supply of filter media for owners of Microclene filters as well as a directly compatible range of filter units of equivalent performance. The table below provides a cross-reference from Microclene products to the equivalent Thor Filtration products. Please refer to this when ordering filter media for an existing Microclene unit. For any unit not mentioned in the table or in the product listing, please drop us an email query as we may be able to assist.

To select the correct size for you workshop, bear in mind that you should be looking to achieve at least ten air exchanges per hour, so for example in a 35 cu. m. workshop you need to select a unit with a throughput of at least 350 cu. m. per hour. (e.g. MC420/TF470)

Model Reference

Filter Flow Rate
Cu. m/hour


Size (mm)






53 watt

 205 dia. x 180 long (excl. foot)




60 watt

205 dia. x 250 tall




60 watt

205 dia. x 335 tall




100 watt

300 x 300 x 130




100 watt

305 dia. x 230 tall




90 watt

308 dia. x 216 tall




90 watt

308 dia. x 390 tall




90 watt

308 dia. x 290 tall




330 watt

500 x 1000 x 400




4 x 100 watt

500 x 500 x 450




62 watt

200 x 165 x 260 tall

All units operate from a 220 volt single phase AC supply and are equipped with a standard UK three-pin plug moulded to the supply lead.
Entries in red indicate discontinued units: however, filter media may remain available for these models - please check the listings, below.

Thor Filtration are building thier range of filter units and media as quickly as prudent development allows. As new units become available, we will add them to our range.

Bear in mind that you cna order Thor filter media to fit your existing Microclene unit. Please note that Thor media is vacuum packaged for easier storage and transit. The media should be carefully removed from the packaging and allowed to re-expand to original size before attempting to mount it in your filter unit.


A Microclene visual model reference is provided here with a listing of items remaining available from stock, below.

MC760 - click for a larger image

Left:  The MC760 is designed to be mounted either on a wall or screwed to a ceiling using the neat built-in lugs.
With the large front inlet and generous filter area the MC760 is a real dust-eater.  The position of the outlet vents on the rear quarters has enabled the exhaust airstream to be directed parallel to the mounting surface leaving the work area free of draughts.
The unit may even be used free-standing on a bench or worktable, if required.

Right: MC200 bench or wall mount unit for small workshops up to approx. 20 cu. m.

The MC420 (left) is a compact suspended unit which will cope with a workshop about the size of a one-car garage.

Microclene MC1210

Right:  The MC1210 will satisfy the requirements of a large garage, home workshop or small industrial unit

Left:  The "Big Daddy" of them all is the quadruple-motor MC3000. Equiped with 4 x 100 watt motors, this piece of kit is capable of managing a 300 cubic metre space on its own. It has 4 brackets on the top for hanging the machine from the ceiling or other suitable points. Supplied with a 20' cable ready for atachment of a suitable plug. Replacement filters are supplied in packs of 4, 1 for each motor.

The model MCP, right, is designed to improve the working conditions for pyrographers operating in an enclosed space by filtering the abstracted air through an activated carbon filter which combines with the dust filter element to remove not only fine dust and fibres, but also odours and smoke.

We have limited quantities of original Miroclene filters and media remaining available, as listed below. Once this stockis exhausted, all products supplied will be from Thor Filtration. If listed Microclene branded filter media is not available we will attempt to replace with a Thor equivalent, if available.


*NB: Prices quoted in pounds sterling. 
Value Added Tax will be added to invoices to EU residents unless
a valid VAT registration number is quoted when ordering.

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1997-2006 P. Hemsley.  The information on this website is the copyright property of Peter Hemsley. 
Coeur du Bois and The ToolPost are trading styles of Peter Hemsley.  Whilst reasonable efforts are made to ensure the accuracy of information presented, no liability can be accepted for errors in this information nor for contingencies arising therefrom.  If you are inexperienced in any aspect of woodworking, we would strongly counsel that you take a course of formal instruction before commencing to practice