... --- Full Range, WITH Steel frame,aluminum blade. have perfect quality and low price. Diffuser, Dampers, Air Grille with Full RangeProduct detail information ... Model: OB-Q-PPS-SSteel frame,aluminum blade.Controls the air volume from full flow to shut off.Screwdriver slot ... full range, high quality, best price, excellent service. Diffuser, Dampers, Air Grille with Full Range