So in the warmer months, I’ve waited for my filter just by using a magvent through my screen.
Enter sub-arctic temps and obscene windchill, and a cut or engrave can become very uncomfortable very quickly. I needed a bit of an update.
Enter Harbor Freight Anti-Fatigue Floor Matting, a little time with a utility knife, and some ingenuity. It isn’t perfect, but it is at least a good proof of concept.
I’ve got a few things I can do to get the edge a little better, but it keeps all wind out. The cold seepage is only enough to make the floor a little colder under the carpet. If I keep the drapes cold and wear socks, I cannot tell the difference. I use a piece of leather as a blast gate. I pull it out when I am cutting, and put it in when I am not. The inside of my 
is room ambient temps, even with 20 or more below windchill and base temps below 0. So long as I make sure of the magnet seal before cutting, no smell or fumes escape inside.