This is an OEM Broan/Nutone replacement Plastic Grille used on Ventilation Fans. This part is sold individually and it includes the springs that hold that part to the frame. To replace this part simply remove the grille by pulling down 2 inches. Reach behind the grille and squeeze the mounting springs to remove the grille. Springs are NOT sold separately.
This is the specially designed damper/duct connector that is supplied by original manufacturer for Broan and Nutone ventilation fans and heaters. It acts as an adapter allowing the unit to be connected to the duct shaft. This part is made from high quality plastic and it is sold individually.