Tuyere (air outlets / vents): louver type air vents, side wall grille type air vents, self hanging louver type air vents, circular diffusers, egg shaped air vents, square leaf return air vents, stainless steel air vents, ball shaped air vents (adjustable), arc/special shaped air vents, three/four sided blow diffusers, swirl air vents, fire resistant air vents, plate type smoke vents, multi leaf smoke vents, remote control multi leaf smoke vents, pressurized air vents, orifice plate air vents, ceiling return air vents, rain resistant louver air vents