PLATFORM BED FRAME. The Platform Bed Frame is an inexpensive alternative to the traditional box spring or foundation. Place your new mattress directly on this heavy duty frame and experience all night comfort and support. 14-inch height provides ample room for underbed storage. This frame can stand alone or be used in place of the slats (inside the side rails) of your current bed. Features and Benefits Portable, compact size makes the frame easy to transport through even the narrowest of spaces, such as stairwells or elevators 14-inch frame height provides more under bed storage than a standard 6-inch to 8-inch metal frame Heavy duty construction supports up to 3,500 lbs. and provides sag and squeak free mattress support Easily assembles in minutes with no tools required Fabric free black anodized coated 100% steel construction is free of dust mites and allergens. Platform foundation assembles in minutes.