[bsr8129]

I am constructing a glass top for my 20L. I read somewhere in a post that someone drilled holes in the top for ventilation. Now I can't find the post abscess wondering what size holes should they be and how many the glass will be 29 inch long and 6 inch wide.

 

[Pumilo]

That's totally a matter of opinion. In my opinion, smaller than 1 inch holes wouldn't do much. Closer together than about 1.5 inches (meaning 1.5 inches of glass between 2 holes) would really weaken your glass. http://www.dendroboard.com/forum/parts-construction/58594-how-drill-your-glass.html

 

[Pumilo]

You could also just do a narrow vent screen. http://www.dendroboard.com/forum/parts-construction/63781-screen-vent-construction-how.html