Good to know! It slides in/out like a puzzle, so should be fine then.
replyYou need a vent there as well so gas can't build up.
replyI doubt a billy book case is anywhere near air tight.
replyIt has nothing to do with air tightness.
replyIf 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.