← Back to Master Cross-Reference Directory • Category: HVAC Nominal-vs-Actual Sizes • Nominal Spec: 20x25x5 (Lennox X6675)

HVAC Nominal-vs-Actual Sizes

Lennox X6675 (MERV 16) vs. X6673 (MERV 11) 19.75" x 24.75" x 4.38" Pressure Drop & Price Comparison

Exact caliper measurement lookup for 20x25x5 (Lennox X6675) HVAC filters. Nominal '20x25x5 (Lennox X6675)' filters vary by up to 0.75" in actual frame depth across OEM media cabinets and retail return grilles.

⚠ CRITICAL FIT RULE: Verify whether your 20x25x5 (Lennox X6675) filter slot requires a Slim-Fit return grille depth or a Deep Media Cabinet spec before ordering multi-packs.

Verified Reddit / X Live Monitor Fit Complaint: r/HVAC — 'Lennox X6675 costs $115 and restricts airflow—switch to X6673'

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
OEM Standard 20x25x5 (Lennox X6675) Media Filter Group: 20x25x5 (Lennox X6675) OEM Cabinet Track	20x25x5 (Lennox X6675) (Measure Frame Caliper) 20x25x5 (Lennox X6675) Nominal Spec	MERV 11 / MERV 13	No Lockout - Check 1/8" Depth Tolerance	$46.99 (1-Pack)	HVACDirect 20x25x5 (Lennox X6675) Exact-Fit 3-Pack (coupon 9QOS73CI2VEW) $19.95 / filter (3-Pack) Save 57%	Verify Exact Fit → Amazon
HVACDirect 20x25x5 (Lennox X6675) MERV 13 Pleated Replacement Group: 20x25x5 (Lennox X6675) Universal Replacement	20x25x5 (Lennox X6675) Exact-Fit Frame 20x25x5 (Lennox X6675) Exact Fit	MERV 8 / MERV 13	Foam Perimeter Seal - Minimal Bypass Gap	$44.00 (1-Pack)	HVACDirect 20x25x5 (Lennox X6675) 6-Pack (coupon 9QOS73CI2VEW) $17.50 / filter (6-Pack) Save 60%	Verify Exact Fit → Amazon
HVACDirect 20x25x5 MERV 11 Pleated Replacement Group: 20x25x5 Return Grille / Filter Rack	20x25x5 (Match Frame Caliper) 20x25x5 Nominal Spec	MERV 11	No Lockout - Check 1/8" Depth Tolerance	$44.00 (1-Pack)	HVACDirect 20x25x5 MERV 11 Multi-Pack (coupon 9QOS73CI2VEW) See current price Save -	Verify Exact Fit → Amazon
HVACDirect 20x25x5 MERV 8 Pleated / Media Cabinet Filter Group: 20x25x5 Media Cabinet / Furnace Slot	20x25x5 (Match Frame Caliper) 20x25x5 Nominal Spec	MERV 8	No Lockout - Verify Cabinet Depth	$39.99 (1-Pack)	HVACDirect 20x25x5 MERV 8 Multi-Pack (coupon 9QOS73CI2VEW) See current price Save -	Verify Exact Fit → Amazon

Frequently Asked Fit & Bypass Questions

Q: Why does my 20x25x5 (Lennox X6675) filter feel too tight or loose in the slot?

Because 20x25x5 (Lennox X6675) is only a rounded marketing label. Always match the exact 1/8-inch caliper dimensions stamped on your existing filter frame.

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