Honeywell HPA4100 replacement filter
Checked against Honeywell’s official page on · US model
✓ This is the filter you need
Honeywell Y1 Filter (True HEPA)
Filter
Y1 Filter
Part number
HRFY1 · 1 filter
Filters needed
1 at a time
Replace
Every 9–12 months
Pre-filterTrue HEPACarbon
Find Y1 Filter on Amazon
Match the genuine part number shown above before you buy. Paid link.
Your purifier
Honeywell HPA4100Match the model on the label exactly — similar names can use different filters.
Why we’re sure
“HPA4100 Required Filters: 1 HRFY1 HEPA Filter”
- Source
- Allergen Plus 4-in-1 HEPA Air Purifier Series – Find My Filter
- Type
- Manufacturer compatibility chart · honeywellpluggedin.com
- Where
- Find My Filter – required filters per model
- Checked
More evidence (part numbers, quantity, interval)
Part number HRFY1
“Honeywell Genuine True HEPA Replacement Filter Y1, HRFY1”
- Source
- Honeywell Genuine True HEPA Replacement Filter Y1, HRFY1
- Type
- Manufacturer filter page · honeywellpluggedin.com
- Where
- Page title
- Checked
How many filters
“HPA4100 Required Filters: 1 HRFY1 HEPA Filter”
- Source
- Allergen Plus 4-in-1 HEPA Air Purifier Series – Find My Filter
- Type
- Manufacturer compatibility chart · honeywellpluggedin.com
- Where
- Find My Filter – required filters per model
- Checked
Replacement interval
“replace every 9 to 12 months”
- Source
- Honeywell Genuine True HEPA Replacement Filter Y1, HRFY1
- Type
- Manufacturer filter page · honeywellpluggedin.com
- Where
- Product description
- Checked