ZVac Nutone 13" Secondary Filter Generic Filter for Nutone Central Vacuums Replaces Part # 84129000 Fits Models CV450, CV750 and CV850 High Quality ZVac Filter Replaces OEM # 84129000 Fits Nutone Central Vacs Using Part 84129000 Fits Models: NuTone 450, NuTone 750, NuTone 850, NuTone CV450, NuTone CV750, NuTone CV850, NuTone CV400 (before 2000 year) Quality ZVac products designed and developed in the USA Features convenient handle for easy maintenance.