Mars Hydro High CFM Grow Tent Support Pole Kit 4' x 4'Description Kit Includes: The kit comes with 8 poles and 8 hooks tailor made for Mars Hydro 4'x4' Grow Tent. High CFM Kit: The Mars Hydro High CFM kit is specially designed to add skeletal structure to the sides of 4'x4' grow tents. It makes use of inline exhaust fans to ensure tent walls remain in their original position. Problem Solution: Growers often face the issue of the tent being sucked inwards, thereby reducing the available growing area for