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Rectorseal NFP-75 NFP - Telescopic Wall Sleeve - 2-1/2-Inch ID - 2-7/8-Inch OD
Wall Sleeves: The Accessory You Never Knew You Needed - GreenBuildingAdvisor
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Garage Workshop Build: Installing a Mini-Split Ductless Air-conditioner | Blood, Sweat, and Sawdust