Can anyone recommend a manufacturer that makes an in-line duct fan that is bidirectional?
I have an 8″ ducted de-stratification system and would like a single fan (hopefully very quit) with a three position switch. The open floor plan two story structure in WV enjoys warm air blowing on the insulated slab in the winter and cool air distribution at the ceiling during the summer.
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Al,
Here's a reversible fan from Tjernlund that operates at two speeds -- either 90 cfm or 180 cfm:
http://www.tjernlund.com/xchanger_basement_fan.htm
The fan was developed to ventilate basements, but I see no reason why it couldn't be adapted for your purpose.