This very stylish dehumidifier branded Prem-I-Air (not a sponsor) consists of a base that blows a gentle stream of hot air that can either be used to dry shoes, or be used to recharge one of two silica gel moisture absorbing cartridges by drying it out.

It is intended to dry enclosed spaces like cabinets (not a room).

These could find use in a storage box for 3D filament or other items where you wanted to control humidity.  The hot air flow ,means they dry relatively quickly compared to the very steamy versions that just contain an internal heater.

The internal heater is very odd.  Initially I thought it was a traditional resistive heater, because I got a slight whiff of that smell you get when the surface oil burns off a new heating element.  But that might have been from the metal electrode plates on either side of a PTC (Positive Temperature Coefficient) block.  What makes it really unusual is that the block is perforated with a grid of holes so the air can blow directly through it.  I'd guess that allows more efficient heating of air, and a reduction in the amount of material needed.  It also explains the air inlet filter material and the unused guides for a removable filter.

Update:-  It's apparently a honeycomb PTC element.

The power supply is a fairly generic module for powering the 9V fan.  Bizarrely, the red LED is NOT powered from that supply, but is run directly on the incoming supply instead, with a sleeved resistor and possibly a diode.  The thermal fuse on the heater block is rated 5A with a trip temperature of 76 degrees C.

This unit came from a UK eBay seller:-
https://www.ebay.co.uk/itm/352580454594
There are other sellers selling them, but since they don't ship to the Isle of Man they won't get a link.


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