Gorilla Grow Tent High CFM Kit for 99For use on all Original Gorilla Grow Tents and Gorilla SHORTY Tents (*excludes Lite Line) Every plant needs a little help to Grow Strong. Let Gorilla Grow Tent maximize your indoor garden's potential with their Grow Strong Accessory Line. Going bananas with your tent walls sucking in? The high CFM (Cubic Feet Per Minute) kit is to help prevent your indoor grow tent walls from sucking in due to high amounts of negative pressure from exhaust systems.