ExactFilterFit CALIPER & RFID SPEC DB
← Back to Master Cross-Reference Directory • Category: HVAC Nominal-vs-Actual Sizes • Nominal Spec: 16x28x4 (Aprilaire 413)
HVAC Nominal-vs-Actual Sizes

Aprilaire 413 vs. 213 vs. 313 Exact Slide-Rail Dimensions & $24 Aftermarket Replacements

Exact caliper measurement lookup for 16x28x4 (Aprilaire 413) HVAC filters. Nominal '16x28x4 (Aprilaire 413)' 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 16x28x4 (Aprilaire 413) 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 — 'Ordered Aprilaire 213 instead of 413, why are both called 4 inch filters?'

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 16x28x4 (Aprilaire 413) Media Filter
Group: 16x28x4 (Aprilaire 413) OEM Cabinet Track
 16x28x4 (Aprilaire 413) (Measure Frame Caliper)
16x28x4 (Aprilaire 413) Nominal Spec
 MERV 11 / MERV 13 No Lockout - Check 1/8" Depth Tolerance $46.99 (1-Pack) HVACDirect 16x28x4 (Aprilaire 413) Exact-Fit 3-Pack (coupon 9QOS73CI2VEW)
$19.95 / filter (3-Pack) Save 57%
Verify Exact Fit → Amazon
HVACDirect 16x28x4 (Aprilaire 413) MERV 13 Pleated Replacement
Group: 16x28x4 (Aprilaire 413) Universal Replacement
 16x28x4 (Aprilaire 413) Exact-Fit Frame
16x28x4 (Aprilaire 413) Exact Fit
 MERV 8 / MERV 13 Foam Perimeter Seal - Minimal Bypass Gap $44.00 (1-Pack) HVACDirect 16x28x4 (Aprilaire 413) 6-Pack (coupon 9QOS73CI2VEW)
$17.50 / filter (6-Pack) Save 60%
Verify Exact Fit → Amazon
HVACDirect 16x28x4 MERV 11 Pleated Replacement
Group: 16x28x4 Return Grille / Filter Rack
 16x28x4 (Match Frame Caliper)
16x28x4 Nominal Spec
 MERV 11 No Lockout - Check 1/8" Depth Tolerance $44.00 (1-Pack) HVACDirect 16x28x4 MERV 11 Multi-Pack (coupon 9QOS73CI2VEW)
See current price Save -
Verify Exact Fit → Amazon
HVACDirect 16x28x4 MERV 8 Pleated / Media Cabinet Filter
Group: 16x28x4 Media Cabinet / Furnace Slot
 16x28x4 (Match Frame Caliper)
16x28x4 Nominal Spec
 MERV 8 No Lockout - Verify Cabinet Depth $39.99 (1-Pack) HVACDirect 16x28x4 MERV 8 Multi-Pack (coupon 9QOS73CI2VEW)
See current price Save -
Verify Exact Fit → Amazon

Frequently Asked Fit & Bypass Questions

Q: Why does my 16x28x4 (Aprilaire 413) filter feel too tight or loose in the slot?
Because 16x28x4 (Aprilaire 413) 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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