Generalaire, General air, General replacement furnace humidiifer filters 990-13, 1099-20 with quantity purchase General Evaporative Water Panel Replacements Filters for General Humidifier model numbers: 709, 990, 1040, 1042, 1137, 1099 We also carry humidifier chemicals. General Whole House Humidifier Filter 990-13 Furnace - $8.75 Each When You Buy 12 $13.99, 6/$59.07, 12/$104.97 General Whole House Humidifier Filter 1099 1099-20 Furnace - $11.93 Each When You Buy 12 $17.99, 6/$78.21, 12/$143.15 Search Here: E-mail Us Privacy Policy Shipping Rates View Cart