Many Carrier whole-house humidifiers are built around the same water panel design Aprilaire uses, so the correct replacement for your Carrier unit is typically an Aprilaire #10 or #35 equivalent.
We carry Tier1 comparable water panels in both sizes, sold in 2-packs. Check the part number on your current panel or your humidifier's label to confirm which one you need. Replace it once per heating season, or sooner if the panel becomes stiff, cracked, or heavily scaled.
Not sure which panel fits? Call 1-800-277-3458.