should be changed every 3 months or when they darken or turn black. Sold by the package (3 filters in a package). Anti-Tarnish Foil Barrier Film
is 18" wide and is used to cover wood trim and bases. Wood outgasses and is a strong contributor to tarnishing if left unchecked. Order by the foot (i.e. enter "6" for a 6 foot continuous length of film).
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