"Big acronym in purifying filters" NYT crossword answer is:HEPA (4 letters length)
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The Big Acronym in Purifying Filters Crossword Clue NYT (December 31 2023) is HEPA, which stands for High Efficiency Particulate Air. HEPA filters are widely used in air purifiers to remove airborne particles such as dust, pollen, smoke, and other allergens. HEPA filters are highly efficient and can capture up to 99.97% of particles that are 0.3 microns or larger in size. They are also very durable and can last up to two years with proper maintenance.