UPGRADED DESIGN — New Smart Hook System (GGS Compatible): Newly added GGS smart hook support makes tool hanging easier and more secure. ENLARGED OBSERVATION WINDOW: Bigger viewing window lets you check plant status without disturbing the environment. EXTRA CABLE PORT: Suitable for connecting to other growing peripheral devices. Our most popular size grow tent, the 4′ x 4′ indoor grow room is a perfect match for both new growers and experienced growers looking to harvest 6+ medium to large plants every 3 months. . This size tent can perfectly accommodate 2x SF2000, 1x G5000/ SE5000 or 1x SF4000. 6 inch inline fan is perfect for 4′ X4′ grow tent User Manual Suggested Lighting: G5000/ SE5000/ SF4000 Recommended Fan Size: 6-Inch