air filter?

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Need your help again guys, anyone know what this is?

what.jpg
 
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it looks like a positive pressure ventilation system. the idea of them is to apply a slight positive air pressure inside the house which encourages air to make its way out of any ventilated spaces such as trickle vents and the like.

Therefore it improves circulation of air and reduces condensation, or so the makes say.
 

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