Filter box for earth heat exchanger

Filter box for earth heat exchanger Below the air input is this filter box before the air continues to the long pipe below the earth, the earth to air heat exchanger.  

Below the air input is this filter box before the air continues to the long pipe below the earth, the earth to air heat exchanger.

index: 2006 2006 
Index: Technic for buildings and living Technic 
Index: Airing systems with heat recovery Airing 
Index: Airing accessories Airing accessories 


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