"james" wrote in message ...
I need to work in my crawlspace for a few hours (sealing ducts, etc).

Due to dust, I use a goggle and a dust mask. However, after a few minutes
the goggle starts to fog up, my face gets hot and wet and I feel like I'm
running out of air. I tried different types of dust masks (with valves and
without) but they all gets hot and are hard to breath after a few minutes.
Inevitably, I had to remove the goggle and dust mask.

Is there an combination goggle/dust mask that is actively ventilated, i.e.
a battery powered fan that draws air, to prevent fogging and moisture
build-up?
I bought an inexpensive one at Garrett-Wade a few years ago. Had to return
it because it was incompatible with hearing protection, but that doesn't
seem to be a problem for you.