FILTER SUBSCRIPTION · A YEAR’S SUPPLY, SHIPPED FREE
25x25x1 Furnace Filter
25x25x1 Furnace Filter
Set it once. Never think about this filter again.
- A year of filters ships now
- A text the day one's due
- One tap confirms
Prefer a one-time purchase instead of a yearly plan? Tap here.
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Wrong size? Return it within 14 days for a refund. Cancel anytime.
Furnace Filter Subscription
Nominal size: 25x25x1. Actual dimensions: 24.5 x 24.5 x 0.75 inches (24½ × 24½ × ¾).
A pleated 1-inch furnace filter subscription: a year's supply ships in one box, and whoever changes the filter — you, a tenant, a building contact — gets a text the day it's due, with a one-tap confirmation back to you. Set it once and never think about this filter again. Available in MERV 8 and MERV 11.
Does this fit your furnace?
This filter is for HVAC slots labeled 25x25x1 (the standard "nominal" size). The actual filter measures 24.5 x 24.5 x 0.75 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 (16x25x1, 20x25x1, 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 | 25x25x1 (25×25×1) |
| Actual dimensions | 24.5 x 24.5 x 0.75 inches (24½ × 24½ × ¾) |
| Filter media | Pleated synthetic |
| MERV options | 8, 11 — see MERV guide |
| Replacement frequency | Typically every 1–3 months. Pets, dust, or heavy use call for more frequent changes. |
| Compatibility | Most residential furnaces, central AC, and air handlers |
Size, MERV, who to text — once. Then forget it.
A year of filters in one box — right size, right address, free shipping.
One short text to whoever changes the filter, on the cadence you choose. One tap confirms.
You get a text when it's done — and two friendly follow-ups go out first if it isn't.
Learn more
- Which MERV rating is right for you? — MERV 8 vs MERV 11, explained.
- Subscription FAQ — Cadence, cancellation, multi-property management, and more.
- How Filterflow works — The full subscription flow, start to finish.
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