Screened opening makes sense if you're trying to heat the county, at
the expense of cooling your house, or if you want ventilation in spring
or fall; else you gotta be nuts. A fire at 550F is a smoker; over 1000F
you're cooking.

Forget the screen. Go for a properly-designed woodstove or insert and
hook it in, and get some useful heat out of it without having to wear a
flack-jacket and full-visor.

J