Filter Whistle 
Knowing when to replace your furnace or air conditioning filter will enable you to keep your system running more efficient as a clogged air filter causes your system to overwork.

When the filter becomes dirty, air will pass through the whistle and inform you to change the filter. The filter whistle comes in two pieces that snap together through your standard fiberglass or paper furnace filter, but you may need to cut a starter hole. Be sure to remove the filter whistle when you change your filters so that you can use it again and again.

Related Topics
filter whistle, clogged air filter, dirty filter
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