I have a 4x4x7 with a 1000w turned down to 500w in a glass hood. I have ac240cfm inline pulling hot air in tent and exhausting past the bulb and out the top (6" ducting) I have an inlet opposite bottom corner thaysc4" for fresh air. With an oscillating fan on floor in front of 4inch hose. I have the probe of thermometer dangling over the canopy.78 currently.topped out at 80. I turn off the fan my temp drops