Features: 1. VIEWING WINDOW Allows you to easily monitor the daily growth of your plants. 2. Inner Tool Organizer - Convenient storage for your tools and accessories. 3. Removable tray for easy cleaning. 4. TOOL-FREE SETUP - Sturdy construction in minutes. 5. Dual layer ventilation opening: inner layer seals tightly around the fan, creating the important negative pressure. 6. Heavy duty SBS zippers: the zippers do not jam.