Feature●The EnviroVent 2 is what is known as a Downdraft Vent.●Removes fumes, odors and vapors. Particularly useful when firing materials such as metallics, and high sulfur clays, which can emit strong odors●Fits popular kilns. The EnviroVent 2 has a spring-loaded collection cup that keeps a tight seal on the kiln as it expands and contracts without stressing the bottom slab.Description Comes with a $100.00 Gift Certificate from Glaze Queen