Test rig for window filtration of smoke/diesel particulate

This bedroom window is double glazed and of the type that will open out and tumble over to allow you to clean the external glass surface from inside.  That house is over the road and build 100+ years back and would like all in that row emit smoke from the chimney in the winter months.  While you can't build houses like that anymore, you're allowed to continue to burn wood/coal in houses that were originally built to do so.

I've made a wooden frame to with 1mm tolerance of the the window frame itself. On it, I can test fabrics.  First up is 50 GSM spunbond polypropylene (that's white rather than the usual black) from AliExpress:

Detail from the corners of the wooden frame:

 

This pops out of the window frame in 15 mph (24 kmh) winds. Well it does if a window on the other side of the house is open, or a door on that side is open/closed at the right moment.  Thus you need a wedge of sorts to make sure is stays in place.

Fabrics to test when I get going include a white nano material fabric more usually used for masks, and some viselene. Both of those are higher filtration than the SBPP I have in single-layer, but the stopping of smoke particles at really really low airflow is partly diffusion not filtration.

I'm a couple of months away from tests involving particle counters (Plantower PMS5003).  I will also chart the buildup of CO2 for the room occupation period - maybe at the same time (Aranet4)