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The Aprilaire A10WPR is the correct humidifier water panel pad that fits the following humidifier systems:

• Aprilaire 110
• Aprilaire 220
• Aprilaire 500
• Aprilaire 500A
• Aprilaire 500-A 
• Aprilaire 550A
• Aprilaire 550-A
• Aprilaire 558
• Autoflo 250G
• Bryant HUMBBSBP 2212
• Bryant HUMBBSBP 2312
• Bryant HUMBBSBP 2412
• Bryant HUMBASBP 2312
• Bryant HUMBASBP 2412
• Carrier HUMCCSBP 2212
• Carrier HUMCCSBP 2312
• Carrier HUMCCSBP 2412
• Carrier HUMCASBP 2312
• Hamilton 12HF
• Hamilton 12-HF
• Healthy Climate HCWB2-12/A
• Honeywell HE220A
• Honeywell HE220B
• Honeywell HE225A
• Honeywell HE225B
• Honeywell HE220-A
• Honeywell HE220-B
• Honeywell HE225-A
• Honeywell HE225-B
• Honeywell HE-220-A
• Honeywell HE-220-B
• Honeywell HE-225-A
• Honeywell HE-225-B
• Lasko 5000L
• Lasko 5000-L
• Lasko 5000EC
• Lasko 5000-EC
• Lasko 6000
• Lennox WB212
• Lennox WB-212
• Totaline P110-SBP 2212
• Totaline P110-SBP 2312
• Totaline P110-SBP 2412

The Aprilaire 550 Humidifier Water Panel Evaporator is a compatible version of the genuine Aprilaire 500 Humidifier Water Panel Evaporator. This Aprilaire humidifier pad is a paper version of the Aprilaire A10PR heavy duty metal water filter. Aprilaire is also identified by the following spelling variations: April Air, Aprilair or April Aire.

Aprilaire A10WPR Humidifier Water Panel Pad specifications:

• Contains 1 filter
• Anti-Bacterial Treated
• High performance, High output
• Replace filters every 6 months
• Dimensions: 9 1/2 inches x 9 3/8 inches x 1 7/8 inches 
• Known as part numbers: A10PR, A10, A-10, 10 and #10
• Fits Aprilaire, Chippewa, Hamilton, Honeywell, Lasko, Totaline, Healthy Climate and Lennox Humidifier systems

For better humidification and optimum performance, replace your Aprilaire water panel evaporator every 6 months depending on usage. Installation instructions are included on your package. The Aprilaire humidifier filter replacement pad is a high performance and high output filter. It effectively reduces conditions that cause low humidity, which could lead to health and environmental problems in your home.