Dust ShroomThe Dust Shroom is a patented foam HEPA filter designed to keep dirt, dust, mold, mildew, pollen, and pests out of your indoor garden, greenhouse, air cooled reflectors, and carbon filters. Designed and manufactured in Fullerton, CA by UNI Filter, the world leader in foam design. Keeping fresh air flowing into your garden without bringing in harmful bugs, mold, bacteria, and more can be a tall order. The Horti Control foam filter Dust Shroom helps you