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• 1-inch furnace filters: A 1-inch filter slides into a slot on the furnace (or on the indoor fan unit some homes have instead), or sits behind a large vent cover on a wall or ceiling.
• 4-inch media filters: A 4-inch media filter is a thick filter, about 4 inches deep, that sits in a cabinet beside the furnace.
• Fridge water and ice filters: The fridge water and ice filter sits inside the fridge or behind the grille at the bottom.
• Furnace humidifier pads: The pad sits behind the cover of the humidifier, a box on the large metal air pipes of the furnace.
• Water softener salt: The salt goes in the tall tank beside the softener.
• Whole-house water filter cartridges: The cartridge sits in a canister, called the housing, on the main water line, often just after the main shutoff valve.
• Air purifier filters: The filter sits behind the front or back cover of the purifier.
• Other cartridges: drinking water, pool and spa: Under-sink drinking water systems (often called RO, short for reverse osmosis), pool and spa filters and other setups take cartridges on their own schedule.
• Smoke and CO alarms: Smoke alarms go in each bedroom, outside each sleeping area and on every level.
• UV bulbs: Some furnaces and water systems use a UV (ultraviolet) light bulb that wears out on a schedule.
• Coil cleaner for the outdoor unit: A gentle rinse keeps the outdoor unit of a central air system clear of leaves, grass clippings and dust.