Filter part number HM1, sponge belt humidifier filter, fits the following Humidimatic furnace models:

• Skuttle 45
• Wait 2000 S.F (original part number EP033)
• Ward 500

Filter part number HM2, sponge belt humidifier filter, fits the following Humidimatic furnace models and other brands' models:

• Beaver model 900
• General 65, 67, 81
• Hamilton Home 4D, 98, 310, 4000, 200D, 400D, 800D
• Home Line 400
• Lasko 900, 400L
• Lobb WA-1, WA-2, AD-1
• Skuttle 90, 90S, 109, 190, H100S
• Super 700 (original part number EP034)
• Wait 90S, Pro-100, 900
• Ward 24, 700, 58518, 58536