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Purifying filter acronym (crossword clue)

4 squares · NYT Crossword · May 31, 2026 · The answer stays hidden until you tap it

This clue appeared in the NYT Crossword on Sunday, May 31, 2026 (18 Down). The answer is hidden below until you want it. Sunday puzzles are large (21 by 21) and themed, about as hard as a Wednesday or Thursday.

Answer length: 4 squares

First letter

H _ _ _

First and last letters

H _ _ A

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About the answer

HEPA as a word: Acronym of high-efficiency particulate air filter.

HEPA has been an answer 2 times in the NYT Crossword and Mini since April 25, 2026.

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