About the 14" x 14" Perforated Curved Blade Surface Mount Diffuser w/ Modular Core - Shoemaker 500MA-14X14
Skip a trip to the store and buy the 14" x 14" Perforated Curved Blade Surface Mount Diffuser with Modular Core (Shoemaker 500MA-14X14) online at PlumbersStock. You need a screwdriver to access the diffuser behind the perforated face. This is a square collar with countersunk mounting holes for a flush installation. The ceiling opening has to be 4" larger than the L x W of the nominal duct size. Shoemaker makes heating and cooling products that are built to last.