Walter Drake

Since 1947


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Furnace Filter Whistle - View 1

Furnace Filter Whistle

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Maximize your furnace’s efficiency! A clogged or dirty furnace filter consumes more energy and costs you money. Whistle sounds when filter becomes 50% clogged, letting you know it needs to be replaced. Wash with warm water and soap to re-use. Works with heating or air conditioner filters.

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