This is an Allied Storm Window model HOL B with an interior removable panel. The top sash of the home’s window is in-operable, while the bottom sash is operable. The storm window is custom made the same way. The top panel is a glass in-operable panel, while the bottom panel can be removed to the interior, and replaced with a screen. This is one of Allied Storm Windows standard colors beige, the other standard colors are white, black, and bronze. Notice how little the storm window sticks out from the exterior casing, it just blends right in.