Many thanks everyone. Having trouble finding a pleated HEPA filter that will fit my design (which is strongly based on the YouTube vid I linked to in my OP)
The actual pics below are from the YouTube vid.
My base/ bottom box will look almost identical as per his pic here
The top box with the filter media sits in the bottom box like this
![Filter advice please on home made fume extractor](https://www.eevblog.com/forum/index.php?action=dlattach;topic=425686.0;attach=2152291;image)
He’s used off the shelf carbon filters like this
![Filter advice please on home made fume extractor](https://www.eevblog.com/forum/index.php?action=dlattach;topic=425686.0;attach=2152297;image)
I’m using something like the pic in my OP, probably 8” / 200 mm in diameter, with mesh at the bottom so I can fill with my own loose carbon
Here’s a not at all to scale drawing of the top box
![Filter advice please on home made fume extractor](https://www.eevblog.com/forum/index.php?action=dlattach;topic=425686.0;attach=2152327;image)
So I’m going to have 8” / 200mm diameter filters and the maximum height of the box is 6 1/4” / 160mm
It will have a lid on it something like this
![Filter advice please on home made fume extractor](https://www.eevblog.com/forum/index.php?action=dlattach;topic=425686.0;attach=2152309;image)
So in reality I need a round pleated HEPA filter just over 8” / 200mm in diameter but no higher than 6” / 150mm
I’ve found these, do people think they will be any good? I’ll need to block the tops off so all air is pulled through them.
https://www.amazon.co.uk/SPARES2GO-Hepa-Filter-Dyson-Purifier/dp/B07H2XDDZP/ref=asc_df_B07H2XDDZP/?The whole point of building my own fume extractor is because to me, around £500 for a half decent one is too expensive for what it is.
So far I’ve spent £15 on the 2 boxes, around £20 on hoses and grill, £50 on fan and around £10 on other bits like sealant.
That comes to £95 and all I need to buy apart from filter media are the 8” / 200mm round inserts as per my original post. Can’t see them costing more than £20 for the pair, so £115 plus filter media.
Ordered 2.5kg activated carbon for £16.50, if those HEPA filters are suitable then another £39
A bit better than around £500 plus for a decent one, that’s presuming it works just as well
I don’t solder all the time but have health issues with lungs hence don’t want to inhale any fumes