Aprilaire 35 Water Panel Evaporative Humidifier Filter
The Aprilaire 35 Water Panel is the original evaporator core for Aprilaire whole-house humidifiers. Built with porous ceramic-coated expanded aluminum, it absorbs and retains water evenly across its mesh honeycomb so dry furnace air evaporates pure moisture without releasing white mineral dust.
3-Year True Cost of Ownership Model
Porous honeycomb matrix ensures continuous, uniform water saturation across airflow.
Factory antimicrobial treatment retards bacterial colonization and bio-film accumulation across wet surfaces.
Captures dissolved calcium and magnesium minerals from hard water, preventing chalky airborne deposits.
Low annual consumable expense ensures optimum winter humidity levels without costly hardware servicing.
- Heavy-duty aluminum honeycomb coated with hydrophilic ceramic for maximum water evaporation
- Distributes water evenly across the entire surface area without channeling or dry spots
- Prevents mineral scale from entering the air stream (no white dust)
- Direct OEM drop-in fit for Aprilaire 600 and 700 series humidifiers
- Hard water with heavy lime/calcium may require changing twice per winter
- Metal edges can be sharp during unboxing (handle with care)
Verified Engineering Specifications
| Nominal Dimensions | 10x13x1.75 | Actual Dimensions | 10.0 x 13.0 x 1.75 in |
|---|---|---|---|
| Filter Depth | 1.75 inch | Media Construction | Slit-expanded aluminum mesh with porous ceramic water-retention coating |
| Replacement Filter Cost | $15.00 | Replacement Interval | Every 12 months |
| Annual Consumable Cost | $15.00/yr (1 pad per heating season) | Compatible Equipment | Aprilaire models 350, 360, 560, 560A, 568, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, 768 |
Our Take on the Aprilaire 35 Water Panel Evaporative Humidifier Filter
The essential seasonal consumable for whole-home humidification. Replacing this pad every autumn ensures optimal 40–50% indoor relative humidity, preventing dry sinuses, static electricity, and shrinking hardwood floors.
Filtration Performance Note
Evaporates clean water vapor; traps minerals, scale, and lime deposits inside the pad matrix.
Installation, Airflow Direction & Maintenance Protocol
Turn off water shutoff. Slide out scale control frame, dispose of old crusted pad, insert new pad with colored indicator dot facing UP, snap into place.
Common Questions About the Aprilaire 35 Water Panel Evaporative Humidifier Filter
Which side of the Aprilaire 35 goes up?
Look for the colored paint dot marked on one edge of the pad. That edge must face UP toward the water distribution tray.
How often should I change an Aprilaire 35 water panel?
Once per year at the beginning of the winter heating season. If your home has extremely hard untreated well water, replace it mid-season (around January).
Can you clean and reuse an Aprilaire water panel?
No. Attempting to wash or soak the pad in vinegar or acid will dissolve the proprietary ceramic porous coating, ruining its water retention ability.