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Furnace Filters and CO Alarms: A Short Shopping List
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Our take: Two cheap things matter before the next cold snap: a furnace filter that fits, and a carbon monoxide alarm on every level and outside sleeping areas. We name no brands and give no prices. We have not tested any product.
Furnace filter
- Match the length and width printed on the old filter's frame (PNNL).
- If the slot allows a thicker filter, PNNL says the thickest that fits gives more surface area.
- Check your manual before going above MERV 12 (PNNL). The EPA says MERV 13 or as high as your system can accommodate. ServiceMag warns a dense 1-inch high-MERV filter can trip the limit switch.
- Mark the date on the frame (PNNL).
Carbon monoxide alarm
- Every level and outside sleeping areas (CPSC, NFPA).
- Battery-operated, or battery backup. Interconnected is best (CPSC).
- Look for a UL or CSA listing and read the label. We opened no source that gives the standard's number, so we do not quote one.
- Test monthly (NFPA, CPSC).
| Item | Where to read more |
|---|---|
| Furnace filter | How to change a furnace filter |
| CO alarm | CO and your furnace |
Ready to shop?
Check the size on your old filter and the label on any alarm before you buy.
See furnace filtersSee carbon monoxide alarms