PLEASE NOTE: The universal reducer (NRD) only fits on a 14" collared diffuser or return to size it down to a 12" or 10", or 8" or 6".
Reduce Inventory: Stock one neck size-14" and scale it down.
Reduce Prep Time: No measuring or counting, no more running of neck sizes, quickly adjust at job site.
Reduce Install Time: Snaps onto the neck and holds tight, rigid plastic won't collapse during install.
Reduce Frustration: Unique Strapping Ridge prevents slip off when reducer is strapped onto duct.