Our custom-designed Martha tent and mushroom grow rack were created specifically for mushroom cultivation, featuring 5 shelves (each with 20 lb. capacity), durable re-inforced woven tent siding, adjustable holes for FAE fan and humidifier, and a built-in sub floor that creates a waterproof barrier. Tent features: Ultra-durable clear vinyl tent with re-inforced woven siding and sub-floor layer provides a waterproof enclosure for growing mushrooms. Flexible tent design allows you to place controls on either side, depending on your grow space. Three built-in loops allow you to hang your humidity and fan controllers on the tent for easy access and viewing. ("S" hooks not included.) Double zipper clear vinyl door panel rolls up to allow easy access and clean up. It also allows ambient, indirect light in for optimal mushroom growth. Rack features: 5 full racks and 18 cubic ft. of space Wire mesh racks can be removed to accommodate different configurations . Shelves come with custom support bars and can be used to house trays, fruiting blocks, jars, and kits (up to 20 lbs per shelf).