like HEPA (a filter is either HEPA-rated or it’s not), MERV ratings fall on a scale from 1 to 16, with higher numbers indicating better performance. Also unlike HEPA tests, MERV tests measure ...

Photo by Cade Martin. Courtesy of Jeopardy Productions, Inc. In 1963, television host and erstwhile actor Merv Griffin was flying back to New York City with his wife Julann, after a weekend ...