New from Aerotech®, the Dragonfly four door damper, 
currently available on the WF – fan series.
The Damper replaces a traditional air entry shutter. The unique Patent Pending four door design optimizes the fan's spiral airflow pattern, offering unsurpassed airflow and energy savings!
The fan installs flush to inside wall; therefore the Inlet guard does not extend into the building. The damper doors close tightly against a rugged bulb seal creating a weather tight seal. A unique constant force stainless steel springs allow the damper doors to open fully when the fan is turned on and close consistently when turned off and does not stretch or warp like a coil spring. The Dragonfly Damper will be arriving on more Aerotech® fan models this season. See the details on www.dragonflydamper.com