PERFECT FOR MUSHROOM MONOTUBS: 2.25" adhesive filter disks are perfect for your mushroom monotub grow chamber. Monotub chambers typically include 6 air flow holes evenly spaced around the monotub walls. These adhesive monotub filter disk packs include 6 filter disks per sheet. Easy Shroom 2.25" diameter filter disks perfectly cover monotub air flow holes 1.75" in diameter. EXACTLY WHAT MUSHROOMS NEED: Easy Shroom adhesive monotub filter disks are made at the perfect density and provide the perfect airflow rate for mushrooms to grow. Fresh air is the most important trigger for mushrooms to fruit and then a critical factor for them to mature properly. With Easy Shroom adhesive filter disks, your mushrooms will get the fresh air exchange (FAE) they need to grow big and strong! EASY TO USE: Easy Shroom adhesive monotub filter disks are so much easier to use than polyfil or filter tape. No more dialing or calibrating your polyfil/tape to find the perfect air flow rate. Simply peel filters off the sheet and stick over your monotub's filter holes! That is all you need to do for your mushrooms to get the perfect amount of fresh air exchange (FAE) in your monotub grow chamber. PROTECT YOUR MUSHROOM GROW: Stop wasting your time and money on contaminated grows! Easy Shroom adhesive monotub filter disks can easily protect your monotub grow chamber from foreign spores and contaminants. Use Easy Shroom filter disks instead of polyfil or filter tape to keep your gourmet mushroom grows safe. 2.25" Filter Disks for Mushroom Monotub Grow Chambers. Easy Shroom filters offer the perfect density and air flow rate for proper humidity and fresh air exchange in your monotub. Use Easy Shroom filters instead of polyfil to keep foreign spores and other bad particles out of your grow chamber. Adhesive filter disks install in seconds to any monotub. No calibration required! These filter disks can cover monotub air flow holes up to 1.75" in diameter.