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Wall Hood Transitions - found at - LUWA: Distributor of Superior Appliances by Design 

  
Wall Hood Transitions

6 in. to 7 in. Round Offset Kit -VP529
6 in. and 8 in. Round to a 10 in. Round Wall Hood Transition-VP562
8 in. and 8 in. Round to a 12 in. Round Wall Hood Transition-VP563
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