You need a vent there as well so gas can't build up.
I doubt a billy book case is anywhere near air tight.
It has nothing to do with air tightness.
If it leaks slightly it could keep the gas/air at an explosive ratio within the box.
Best to just have it vent out into the room. then it's noticeable.
I doubt a billy book case is anywhere near air tight.
It has nothing to do with air tightness.
If it leaks slightly it could keep the gas/air at an explosive ratio within the box.
Best to just have it vent out into the room. then it's noticeable.