Although you might have the best fan in the industry, coupling your fan with lower-quality tubings and dampers could affect the performance of your home ventilation. With the Panasonic Whisperline Installation Kit, you're able to get the industry standard coupling materials for a solid, and durable installation into your application. The Panasonic PC-NLF06D is an accessory kit that includes (2) 6-inch double inlet grilles, two back draft dampers, two clamps, zip ties, and a 6" to 6" Y-Adapter. The grilles are constructed with a beveled edge and are finished in white. The PC-NLF06D is compatible for usage with the Panasonic FV-20NLF1 Whisperline 240 CFM and Panasonic FV-30NLF1 Whisperline 340 CFM Models.