J&D Manufacturing has redesigned its Shaded Pole Blowers for greater efficiency, and added corresponding aluminum mounting brackets. Shaded Pole Blowers have adjustable damper doors that are designed to inflate the plastic layers of double polyethylene sided greenhouses to create a layer of insulation. Two models are available, both with or without a cord and shipped individually packaged. Motors have thermal overload protection and carry a one year warranty. Corresponding brackets allow the blowers to be mounted to a support post or tube for easy installation.