Resideo lists FC100A1003 as a replacement filter for the F100F1620 cabinet. Start with that part number when comparing products.
Your filter passport
FC100A1003
Manufacturer-listed replacement for F100F1620
Cabinet model
F100F1620
Original replacement part
FC100A1003
Manufacturer size label
16 × 20 × 4 in.
Information checked
October 9, 2026
This size is a label, not measured dimensions. Buy by verified model compatibility and the specific replacement's dimensions. Follow your equipment instructions for filter selection and replacement.
Installed on: __________________ Next check: __________________
Compare the specific replacement
Manufacturer-listed compatibility and supplier-listed compatibility are different evidence. The original part is listed above; the aftermarket rows below reflect each supplier's published cross-reference. These products have not been physically fit-tested by us.
FC100A1003 product size comparison
Product
Size label
Published actual size
Evidence / purchase
Honeywell Home / ResideoOriginal replacement · FC100A1003
16 × 20 × 4 in.
Not verified in this guideWe do not infer actual dimensions from the nominal label.
No aftermarket option has been verified for this passport yet. This is not an exhaustive product directory.
No live prices, stock checks, physical fit testing or independent performance rankings. Koch specifications are from its technical bulletin; its legacy link may now redirect to the knowledge center.
Before you order
Confirm the complete cabinet model on its label.
Match the exact original replacement part number.
Check the seller's current cross-reference, actual dimensions and return terms.
Follow your equipment instructions for airflow, filter selection and installation.
Why the depth may look different
Some compatible replacements use a 4.4- or 5-inch label. The label alone cannot establish fit. See the sourced sizing example.