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【Efficient Air Circulation and Filtration】Using high-quality, 2mm-thick filter material, we achieve an optimal balance between air permeability and filtration performance. This effectively blocks tiny particles while ensuring fresh air circulation, thereby providing a clean environment for mushroom growth that meets the requirements for Monotub cultivation 【Accurate Size Adaptation】The filter disc has a diameter of 3 inches, effectively covering ventilation holes measuring 2.5 inches or smaller. It is specifically designed for use with standard Monotub equipment to air leakage 【One-Click Installation】The peel-off adhesive backing design eliminates the need for tools or additional materials, allowing for complete coverage of the Monotub full hole in just 30 seconds. This feature also reduces cleaning time when removed 【Long-Term Durability】This product can be multiple planting cycles and balances humidity and oxygen exchange, significantly improve the vitality of mycelium, and promoting the althy growth of mushrooms. It offers long-term durability without degumming or deformation, ultimately saving on replacement costs 【Cost-Effective Package】24 pieces designed to meet long-term usage needs, making it suitable for home gardening. It effectively assists users in focusing on mushroom cultivation, making it ideal for mushroom growers seeking flexible stocking options ASIN B0F65VB41W Item Weight 2.08 ounces Manufacturer GeekNi Package Dimensions 8.94 x 6.3 x 0.55 inches