hahaha i was gonna post my thread in your thread but then i saw someone posted on here well i think the screen is about 18in high from base of speaker then bout 2 inches between that and the plexiglass and about 4 in the above area im sure it would work in a 20 in amp just make a cool tube an have good vent youll only have to veg for like 3 weeks to fill up your screen good luck with your grow i will post some pics later