How to remove varnish<br>Create good ventilation. Whether your sanding or using a chemical solvent, it's a good idea to have ventilation. Open windows and use fans to create cross-ventilation if you're inside.
The fumes from varnish aren't very harmful to humans.
Inhaling fumes from varnish came be very dangerous. The system may have trouble with gauging exposure levels and determining if it is harmful.
( z1 harmful :polarity - :ARG0 ( z2 fume :source ( z3 varnish ) ) :ARG1 ( z4 human ) :degree ( z5 very ) )