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) is the most. common diagnosis made in many specialty clinics serv-. ing patients with dizziness. This diagnosis is suggested by. a history of brief (less than one minute) episodes of ver-. tigo that are provoked by rolling over in bed, lying down, sitting up from a supine position, bending over, or look-. ing up. BPPV commonly is worse in the early morning. (matutinal vertigo), and may be absent for weeks or.