Polyester Blue Filters (19 7/8 x 21.5 x 1) - 6 per box
$47.63
These panel filters are rigidly constructed using a progressively dense fiberglass or Polystrand media to maximize dust holding capacity. The metal grids are thermally bonded to the internal sides of a heavy-duty one-piece craftboard frame. The Merv rating is 7 and suggest change within 30 to 90 days.