Surface mount grilles that open and close to give you access to your duct for filter changing. Our decorative resin return air filters grilles are called LazyVents for a reason, with super easy and quick open/close function, these filter return air covers are ideal for quick filter changing. Each filter grille comes with several strong neodymium magnets that have an 8lb pull force each. For more info check: How to Install a Lazyvent