The Vent-Bettina rotational ceiling fan is thoughtfully designed with its arms gently upward curving. The fan offers fluid lines and quiet axial rotation. The fan heads can be infinitely positioned in 180-degree arcs for optimum air movement; the greater the angles of the motors to the horizontal support rods (up or down), the faster the axial rotation. A slow, controlled axial rotation is achieved by both fan head position and fan blade speed.Features: Matthews Rotational Fans Circulate Heat and Air Conditioning More Efficiently Than Traditional Paddle FansConstructed of cast aluminum, heavy spun and stamped steel, this fan carries a limited lifetime warranty.Each unique motor mount and fan head knob is made of genuine marbleized Bakelite.Decora-style fully variable wall switch in white.Includes 10" field cuttable downrod. Downrods can be easily field cut; they are not threaded.Flat ceiling canopy. Compatible with 29 Degree vaulted ceiling canopy. (Sold Separately)All Matthews Gerbar fans are hand made and not mass produced.Safety cages available for low ceiling applications (sold separately).Made in Brazil. Assembled and tested with care in the USA.Matthews-Gerbar fans do not oscillate on their own. The fan heads can be pivoted to change the direction.