Aprilaire 45 Water Panel

Keep your home's air comfortable and healthy with the Aprilaire 45 Water Panel, the essential replacement humidifier filter for your whole-house system. This 2-pack of genuine OEM components is designed specifically for Aprilaire Model 400, including 400A and 400M units. Unlike standard panels, the Aprilaire 45 features a specialized heavy-duty paper construction reinforced with aluminum layers, optimized for water-saver (drainless) humidifiers. This design allows the water panel evaporator to wick moisture from the bottom up, ensuring maximum evaporation efficiency and consistent indoor air quality.

By regularly replacing your Aprilaire 45 humidifier pad, you ensure your HVAC system maintains the ideal 40%–60% humidity range, which helps reduce dry skin, static shock, and respiratory irritation. These genuine Aprilaire parts are coated with an anti-microbial agent to inhibit the growth of biological contaminants. For peak performance in your whole-house humidifier, it is recommended to replace the panel twice per heating season.

• Optimized Efficiency: Designed specifically for water-saver models to maximize moisture output without excess drainage.
• Genuine OEM Quality: Ensures a perfect fit and reliable performance for Aprilaire 400 series units.
• Enhanced Durability: Heavy-duty paper media reinforced with two layers of aluminum for long-lasting use.
• Healthier Living: Helps maintain optimal humidity levels to reduce airborne viruses and household allergens.

How often should I replace the Aprilaire 45?
Unlike other models, the Model 45 should be replaced twice per heating season due to its unique wicking action in drainless humidifiers.

Which side of the water panel faces up?
The Aprilaire 45 does not have a specific paint dot; it can be installed in either orientation within the scale coordinator tray.

Will this fit my Aprilaire 500 or 600 model?
No, this water panel is specifically engineered for the Model 400 series. Please check your humidifier's model number before purchasing.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.

This item is not eligible for free shipping.