Water Panel Guide - Select the Right AprilAire Humidifier Filter
Tier1 Replacement Wick Filter for Aprilaire 400, 400A, and 400M (2-Pack) TIER1-HMF1320-2PK - The Home Depot
HQRP 2-pack Water Panel Filter Pad for Aprilaire 45 fits Aprilaire 400 / 400A / 400M Humidifiers - Walmart.com
Aprilaire Humidifier Model 700
2 Humidifier Filters for Aprilaire 600 - Walmart.com
Amazon.com: Aprilaire 35 Water Panel Humidifier Filter Replacement for Aprilaire Whole House Humidifier Models 350, 360, 560, 560A, 568, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, 768 (Pack of 1) : Appliances
Amazon.com: Tier1 Humidifier Filter Replacement for Water Panel 10 Aprilaire Models 110, 220, 500, 550, 558 - Improves Air Quality in Homes and Offices - (2 Pack) : Home & Kitchen
Amazon.com: HQRP 2-Pack Water Filter Replacement compatible with Aprilaire 35 fits 700, 700A, 700M, 600, 600A, 600M, 350, 360, 560, 560A, 568, 760, 768 Humidifiers : Health & Household
Amazon.com: Aprilaire 4785 Humidifier Maintenance Kit with Water Panel Model No. 35 Humidifier Replacement Filter for Aprilaire Whole Home Humidifier Models: 350, 360 : Appliances
2) High Output Humidifier Water Pad Filter for Aprilaire A35W, A35W-PDQ-6 | eBay