Simple HEPA air cleaner teardown

A very basic unit with minimal electronics and a simple three position switch. Off, Low and High.

I was hoping this unit would contain an ioniser module, and it turns out to have a proper bipolar ioniser module in it, with both positive and negative ion emitters in a very basic configuration.
Ionisers like this emulate a natural outdoor process where environmental factors like wind, rain and sunshine cause electrostatic effects that disassociate air molecules, causing them to form into short-lived molecules that seek stability again by interacting with airborne contaminants.
The concept is that indoor air quickly loses those natural active elements, so they are replaced by units like this using electrostatic effects.

This is a very controversial area of science with some very bold profit-motivated marketing campaigns and commercially biased "research" swamping out the poorly-funded independent scientific research.

The unit has a simple two speed shaded pole fan motor and very little else other than the usual pleated paper filter with a layer of activated carbon mesh.

The simplicity and lack of fancy controls means this type of unit should be fairly reliable. It's possible that the filter is a standard size as used in some vehicles as a cabin filter. The dimensions are 20mm thick and 154mm by 180mm. A quick search on eBay at the time of making this video shows this small and basic filter being sold at a staggering cost of £35 plus shipping. That is over three times the price I was expecting, and similar to the cost of the entire unit. It's reminiscent of the printer industry and its astronomically expensive ink refills.
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