ExactFilterFit CALIPER & RFID SPEC DB
← Back to Master Cross-Reference Directory • Category: HVAC Nominal-vs-Actual Sizes • Nominal Spec: 16x25x5
HVAC Nominal-vs-Actual Sizes

16x25x5 Furnace Filter Exact Actual Dimensions & Cross-Reference Chart

A '16x25x5' furnace filter is almost never 16" x 25" x 5". Actual caliper thickness ranges from 4.38" (4-3/8") on Honeywell & Lennox cabinets up to 5.25" (5-1/4") on Goodman/Amana media cabinets. Ordering the wrong brand jams the cabinet door or leaves a 7/8" bypass gap.

⚠ CRITICAL FIT RULE: Measure your old filter's depth with a tape measure before buying. If your cabinet takes 4-3/8" depth (Honeywell FC100A1029 / Lennox X6670), a 5-1/4" Goodman filter WILL NOT slide in. Exact-size multi-packs ship from HVACDirect — enter coupon 9QOS73CI2VEW at checkout.
Verified Reddit Fit Complaint: r/HomeImprovement — 'My replacement 16x25x5 air filter is too big for my slot'
Verified X Fit Complaint: @MyRoostOfficial — 'Why do 5-inch furnace filters marked 16x25x5 vary by 3/4 inch in thickness?'

Side-by-Side Exact Caliper & RFID Compatibility Matrix

Measured to 1/8" (0.125") Tolerance
OEM Brand & Model Exact Caliper Size (In) MERV / NSF Cert Slot Fit / RFID Chip Status OEM Price Verified Multi-Pack Match Direct Spec Links
Honeywell Home FC100A1029 / FC200E1029
Group: Honeywell / Lennox 4.38" Slot
 15.88" x 24.75" x 4.38"
15-7/8" x 24-3/4" x 4-3/8"
 MERV 11 / MERV 13 No Lockout (Mechanical Slot Fit) $44.95 (1-Pack) HVACDirect 16x25x5 (Honeywell 15.88x24.75x4.38 Spec) / Nordic Pure (coupon 9QOS73CI2VEW)
$22.49 / filter (2-Pack) Save 50%
Verify Exact Fit → Amazon
Lennox Healthy Climate X6670 (HCF16-11)
Group: Honeywell / Lennox 4.38" Slot
 15.75" x 24.75" x 4.38"
15-3/4" x 24-3/4" x 4-3/8"
 MERV 11 / MERV 16 No Lockout (Interchangeable w/ 15.88"x24.75"x4.38") $48.00 (1-Pack) HVACDirect X6670 Exact Fit 2-Pack (coupon 9QOS73CI2VEW)
$21.95 / filter (2-Pack) Save 54%
Verify Exact Fit → Amazon
Goodman / Amana M1-1056 (GMU1625)
Group: Goodman / Five Seasons 5.25" Deep Slot
 15.38" x 25.50" x 5.25"
15-3/8" x 25-1/2" x 5-1/4"
 MERV 11 Incompatible w/ Honeywell/Lennox (0.87" thicker) $52.99 (1-Pack) HVACDirect M1-1056 Exact 15-3/8x25-1/2x5-1/4 (coupon 9QOS73CI2VEW)
$25.50 / filter (2-Pack) Save 52%
Verify Exact Fit → Amazon
Ultravation / Trion Air Bear 255649-105
Group: Trion Air Bear 4.88" Slot
 15.63" x 24.13" x 4.88"
15-5/8" x 24-1/8" x 4-7/8"
 MERV 8 / MERV 11 / MERV 13 Requires Foam Gasket Strip on Front Edge $46.50 (1-Pack) HVACDirect Trion Air Bear 16x25x5 (15.63x24.13x4.88) (coupon 9QOS73CI2VEW)
$23.80 / filter (2-Pack) Save 49%
Verify Exact Fit → Amazon
Standard Retail '16x25x5' (Filterbuy / Nordic Pure Retail)
Group: Standard 4.38" Replacement Slot
 15.75" x 24.75" x 4.38"
15-3/4" x 24-3/4" x 4-3/8"
 MERV 8 / MERV 11 / MERV 13 Direct fit for Honeywell F100/F200 & Lennox HCC16-28 $39.99 (1-Pack) HVACDirect 16x25x5 Multi-Pack (3-Pack Bundle) (coupon 9QOS73CI2VEW)
$19.65 / filter (3-Pack) Save 51%
Verify Exact Fit → Amazon

Frequently Asked Fit & Bypass Questions

Q: Can I use a Lennox X6670 (15.75 x 24.75 x 4.38) in a Honeywell FC100A1029 (15.88 x 24.75 x 4.38) cabinet?
Yes. The 0.13-inch (1/8") height difference is within the rail tolerance of both Honeywell F100/F200 and Lennox HCC16-28 cabinets, and both share the exact 4.38" (4-3/8") depth.
Q: Why won't my new 16x25x5 filter fit into my furnace slot?
You likely bought a Goodman/Amana M1-1056 spec filter (5.25" deep x 25.50" long) for a Honeywell/Lennox 4.38" slot, or an Air Bear 4.88" deep filter for a 4.38" track. Check the third dimension (thickness) stamped on the side frame.

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