The Sun Hut tent is easy to build, easy to use, and excellent for any type of indoor gardening. No toxicity issues for your plants. Larger than competitive huts to accommodate for growing systems. Thick black canvas exterior. Highly reflective silver interior. Heavy-duty zippers. Metal framing is made of strong and durable steel tubing. Two 6" duct flanges included. Venting and cord holes offer sleeves with draw strings to seal the exit ports around ducting and cords. 4' x 4' and 4' x models have zippered doors in the back for easy access on both sides of the Sun Hut. Comes with bracket to support exhaust fan and filter. SILVER INTERIOR IS 30% MORE REFLECTIVE THAN WHITE PLASTIC INTERIOR Actual Interior Dimensions: 4' x 8': 112" x 57" x 84