ExactFilterFit CALIPER & RFID SPEC DB
← Back to Master Cross-Reference Directory • Category: HVAC Nominal-vs-Actual Sizes • Nominal Spec: 20x25x5
HVAC Nominal-vs-Actual Sizes

20x25x5 Furnace Filter Exact Actual Dimensions (Honeywell FC100A1037 vs. Lennox X6673 vs. Goodman M2-1056)

'20x25x5' is a nominal label: Honeywell FC100A1037 media measures 19.94" x 24.69" x 4.38", Lennox X6673 (Healthy Climate 20x25x5) about 19.75" x 24.75" x 4.38" — interchangeable — but Goodman/Amana M2-1056 deep cabinets take a 5.25"-deep media pack, and Trion Air Bear 20x25x5 is 4.88". Mixing families leaves a bypass gap or jams the door.

⚠ CRITICAL FIT RULE: Measure depth. 4-3/8" = Honeywell/Lennox family; 4-7/8" = Trion Air Bear; 5-1/4" = Goodman/Amana. Order exact-size multi-packs from HVACDirect with coupon 9QOS73CI2VEW.
Verified Reddit Fit Complaint: r/HomeImprovement — 'Lennox X6673 vs Honeywell FC100A1037 vs Goodman M2-1056 size difference'

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 FC100A1037 / FC200E1037
Group: Honeywell / Lennox 4.38" Slot
 19.94" x 24.69" x 4.38"
19-15/16" x 24-11/16" x 4-3/8"
 MERV 11 / MERV 13 No lockout — fits Honeywell F100/F200 cabinets $49.99 (1-Pack) HVACDirect Honeywell FC100A1037 exact-fit (coupon 9QOS73CI2VEW)
$29.95 / filter Save 40%
Verify Exact Fit → Amazon
Lennox Healthy Climate X6673 (HCF20-11)
Group: Honeywell / Lennox 4.38" Slot
 19.75" x 24.75" x 4.38"
19-3/4" x 24-3/4" x 4-3/8"
 MERV 11 / MERV 16 Interchangeable with FC100A1037 in most HCC20-28 cabinets $55.00 (1-Pack) HVACDirect Lennox X6673 compatible (coupon 9QOS73CI2VEW)
$31.50 / filter Save 43%
Verify Exact Fit → Amazon
Goodman / Amana M2-1056 (GMU2025)
Group: Goodman 5.25" Deep Media Slot
 19.38" x 25.50" x 5.25"
19-3/8" x 25-1/2" x 5-1/4"
 MERV 11 NOT interchangeable — 0.87" deeper than Honeywell/Lennox $59.99 (1-Pack) HVACDirect Goodman M2-1056 media (coupon 9QOS73CI2VEW)
$33.00 / filter Save 45%
Verify Exact Fit → Amazon
Trion Air Bear 255649-102 (20x25x5)
Group: Trion Air Bear Cabinet
 19.63" x 24.13" x 4.88"
19-5/8" x 24-1/8" x 4-7/8"
 MERV 8 / MERV 13 Narrower frame — loose in Honeywell cabinet $47.50 (1-Pack) HVACDirect Trion Air Bear 20x25x5 (coupon 9QOS73CI2VEW)
$27.95 / filter Save 41%
Verify Exact Fit → Amazon
Generic retail '20x25x5' (Filtrete/Aerostar)
Group: Universal box filters
 19.5" x 24.5" x 4.38" (varies)
19-1/2" x 24-1/2" x 4-3/8"
 MERV 8–13 Check frame depth — many 'universal' 5" filters are 4.38" $39.99 (1-Pack) HVACDirect 20x25x5 multi-pack (coupon 9QOS73CI2VEW)
$24.99 / filter Save 38%
Verify Exact Fit → Amazon

Frequently Asked Fit & Bypass Questions

Q: Are Honeywell FC100A1037 and Lennox X6673 interchangeable?
In most cases yes — both are ~4-3/8" deep with near-identical face size; confirm your cabinet door closes flush.
Q: Will a Goodman M2-1056 fit a Honeywell cabinet?
No. At 5-1/4" deep it is ~7/8" too thick for the Honeywell F100/F200 track.

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