Right Size Air product guide
Honeywell HPA304 Allergen Plus HEPA Air Purifier, White
Rooms up to about 465 sq ft where simple manual controls suit
Honeywell's HPA304 runs three Type R True HEPA filters behind a Type A odour-reducing pre-filter. It is AHAM Verified for 465 square feet. Plan on three HEPA filters a year and a pre-filter every three months, none washable, with manual cleaning levels, a timer and a five-year warranty.
Listing checked . Confirm the model, included parts and availability before ordering.
Published specifications
- Honeywell: AHAM Verified 465 sq ft, air filtered every 12.5 minutes
- Manual: HRF-R3 HEPA pack every 12 months
- Manual: HRF-AP1 pre-filter every 3 months
- Manual: three cleaning levels, Turbo, 2/4/8 h timer, dimmer
- Honeywell: 22.3 H x 20.0 L x 10.8 W in
- Manual and Honeywell: five-year limited warranty
Fit and limits
Strengths
- AHAM Verified room size published by the maker
- Five-year limited warranty
- Simple controls with timer and dimmer
Caveats
- Three HEPA filters to replace each year
- Pre-filter replaced every 3 months; nothing washable
- Listing model field HPA104WMP does not match HPA304
Which Honeywell this is
Honeywell's product page lists this as the HPA304 in white, its HEPA air purifier for extra-large rooms. The manual shipped with it covers four series at once, and for the HPA300 series it describes a two-stage system: a pre-filter in front of three True HEPA filters.
The Amazon details table lists model number HPA104WMP and part number HPA304V2, with compatible models HPA300 and HPA304 and manufacturer Kaz. The HPA104 code does not match the title or Honeywell's page, so check the label on the unit when it arrives.
Room size: 465 square feet verified
Honeywell's page says the HPA304 is independently tested and AHAM Verified to circulate and filter the air every 12.5 minutes in a 465 square foot room, which is 4.8 changes per hour. The 2,250 square foot figure in the Amazon title is for one air change per hour.
Neither the page nor the manual pages we read prints the CADR numbers themselves, so the 465 square foot figure is the only sizing number Honeywell gives. The Amazon table lists 80 watts and 17 pounds; Honeywell's page does not state either.
Placement from the manual
The manual asks for a firm, level surface with the front of the unit facing away from the nearest wall or furniture. It does not give a clearance distance in inches, so leave open space in front of the grille rather than pushing it into a corner.
It should be used upright, indoors, away from bathrooms, laundry areas and other damp places, and near its outlet without an extension cord. Honeywell lists the unit at 22.3 inches high, 20.0 inches long and 10.8 inches wide.
Filter costs are driven by three HEPA filters
The HPA300 series takes three Type R True HEPA filters, listed as HRF-R3 and replaced every 12 months, and one Type A pre-filter, HRF-AP1, replaced every 3 months. Honeywell's page repeats both intervals. The manual lists an alternative pre-filter, HRF-APP1, at the same 3-month interval.
None of the filters is washable. The manual describes a filter reset after replacement, and asks for the unit to be cleaned with a dry cloth every three months. The manual also covers storage longer than 30 days, so read that page before putting it away for a season.
Controls and settings
The manual describes three cleaning levels plus Turbo, an auto-off timer with 2, 4 or 8 hour settings and a dimmer for the display. The manual pages we read describe no auto mode or air-quality sensor, so you set the speed yourself.
The manual carries an ENERGY STAR note. Because the pre-filter is due every three months and the three HEPA filters yearly, the running cost is set by filters rather than electricity; the Amazon table's 80 watts is the only power figure we found.
Five-year limited warranty
The manual and Honeywell's page both give a five-year limited warranty, with Kaz named in the manual. The filters are covered only for material or workmanship defects, not for wearing out, so the three-monthly pre-filter and yearly HEPA changes are your cost.
The manual warns that opening the motor housing may void the warranty, so leave any internal fault to the warranty process. Keep proof of purchase, and read the manual's warranty page for the full conditions, which we did not record in detail.
Check the current listing
Confirm the model, included parts and availability before ordering.
Primary sources
- Honeywell Plugged In product page for the Allergen Plus HEPA air purifier HPA304
- Honeywell HPA090, HPA100, HPA200 and HPA300 series owner's manual supplied with the listing
Primary sources checked .
Compare with
- GermGuardian AC4825E 22-inch HEPA PURE Tower Air Purifier with UV-C
A room around 153 sq ft, with a foot of clear space all round
- Coway Airmega Mighty AP-1512HH Air Purifier, Black
A bedroom or office up to about 361 sq ft, with 8 inches clear around it
- Levoit Core 300-P Air Purifier, White
A bedroom or office around 222 sq ft, controlled by hand
- Afloia Kilo Air Purifier, White
A bedroom, study or office of about 269 sq ft
- Levoit Vital 200S-P Smart Air Purifier (LAP-V201S-WUS), White
A room around 388 sq ft with 15 inches clear in front of it
- Medify MA-40 Air Purifier with H13 HEPA, White
Rooms around 375 sq ft where a timer and child lock matter
Side-by-side pages, this model next to: Levoit Vital 200S-P Smart Air Purifier (LAP-V201S-WUS), White, Medify MA-40 Air Purifier with H13 HEPA, White.