[Bright-eyed Beads]

I think that it is best if you post this in the technical forum as I am sure that someone ought to know there. But I have to confess that I thought that a ventilation hood with extraction fan, hopefully venting outside, plus at least two sources of fresh air intakes ie open window or door, that are cross ventilating should be fine!!! Now you have me worried too...

Hope Hubby is responding to treatment and that you both overcome all you throat/mouth problems. Take good care of yourselves and I hope we can all get to the bottom of this problem

Cheers

Jenny