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CHOKING HAZARD -- Small parts. Not for children under 3 yrs.
i put it on my filter and it never did anything. possible i installed it wrongPublished 3 months ago by THOMAS MYERS
I just got it and I am testing it out so I do not really know exactly how it works.Published on May 10, 2013 by Paul Hugh Reilly
I stopped using it as it may come apart and fall inside of my air handler.
It seems not to snap or lock enough for me.
The sound was not loud enough for me.
Bought three and have given two away. No whistling yet but all were put into new filters. Product came quickly and was recommended in utility saving brochure. We'll see.Published on April 13, 2013 by Joan M. Cole