TRUaire 290 Series Fixed Bar Return Air Filter Grilles. Sizes listed below are LIST SIZES -- opening size. LIST SIZE grille frame will slide into a 12x12 drywall opening. The actual outer size of the grille frame is larger.
Table of Contents. Benign paroxysmal positional vertigo (BPPV) is a problem with the nerves and structure of the inner ear that causes you to suddenly feel dizzy. You might feel like the room is spinning around in circles or that your surroundings are moving. This feeling is called vertigo..
Benign paroxysmal positional vertigo (BPPV) causes short episodes of intense dizziness (vertigo) when you move your head in certain directions. It it thought to be caused by tiny solid fragments (otoconia) in the inner ear labyrinth.