Broan-NuTone VX3918STD 8-Gallon Bag Standard Filter Media Bags For VX550 and VX1000 Series, 3 Per Pack
Model VX3918STD: Two-ply electrostatically charged media captures particles down to .10 microns at 85-Percent efficiency. Eight gallon bag, 3 bags in a pack-for models VX550 and VX1000.