On Wednesday, December 11, 2019 at 3:16:32 PM UTC-5, Dan Marotta wrote:
Several of the Stemme owners are looking at this product:
https://proteng.com/pictures/

That looks like a good solution for a closed space, but will it have a meaningful effect in an area with air forced through at high volume? Would you have a separate warning so you'd know to close the Stemme vents? Probably wouldn't work in an MG with an open engine bay (doors that don't close)?