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The General G13PR is the correct filter pad replacement for the following furnace humidifier models:
The GeneralAire 990-13 Replacement Humidifier Filter that is also known as part number G13PR. This Generalaire humidifier filter has a super absorbent coating for maximum water distribution and increased humidity output. The excess coating may come off before using. We offer this replacement humidifier filter in the paper version of the General 990-13 Humidifier Filter Pad (G13WPR). To increase the efficiency of your humidifier, this General 990-13 humidifier filter is coated with a non-soluble wetting agent.
The General G13PR specifications:
The General 990-13 humidifier filter is used in flow-through humidifiers. Replace your General humidifier filter twice a season for optimum performance based on usage.