i have my 6 foot boa in a tank with wood on top of screens can he breathe??

[redtailboas213]

okay i got my 6 foot boa I think its a red tail?? In a 60 gallon tank.. 4 feet long 17 inches wide and 17inches tall.. It has a screen top as lid but I have a piece of flat Wood on top covering the whole top lid.. it fits perfectly flush with no sign of a gap.. I use it to keep humidity in.. Is my snake able to breath like this??? its not sealed or nothing but i cant see a gap ...