Furnace Filter Subscription
Nominal size: 20x20x4. Actual dimensions: 19.5 x 19.5 x 3.75 inches (19½ × 19½ × 3¾).
A pleated 4-inch furnace filter delivered monthly to every unit in your property — with SMS install reminders sent to tenants, and automatic confirmation back to you. Available in MERV 8 and MERV 11.
Does this fit your furnace?
This filter is for HVAC slots labeled 20x20x4 (the standard "nominal" size). The actual filter measures 19.5 x 19.5 x 3.75 inches — slightly smaller than nominal so it slides cleanly into the slot without binding.
To confirm fit:
- Pull out your current filter from the unit.
- Look for the size printed on the cardboard frame — typically the nominal size (16x25x4, 20x25x4, etc.).
- If you can't find a size label, measure the slot opening with a tape measure. The nominal size should be ½ inch larger than your slot dimensions in each direction.
Specifications
| Nominal size |
20x20x4 (20×20×4) |
| Actual dimensions |
19.5 x 19.5 x 3.75 inches (19½ × 19½ × 3¾) |
| Filter media |
Pleated synthetic |
| Frame |
Beverage board (recyclable) |
| MERV options |
8, 11 — see MERV guide
|
| Replacement frequency |
Every 30 days (recommended) |
| Compatibility |
Most residential furnaces, central AC, and air handlers |
