PuroAir 400 Replacement Filter
- Air Purifier Filter
- 2
- 2
- 1.7 pounds
- Better rated than 56%
The straightforward choice for keeping a PuroAir 400 working as designed, provided you accept that the recurring cost is high relative to generic alternatives.
As an Amazon Associate, ProductDome may earn a commission from qualifying purchases made through links on this page.
Sizes Available
Need a different one? Pick on Amazon →
How it ranks among the 18 air purifier filters we track
4.8★ across 749 Amazon ratings, Bayesian-smoothed toward the category average.
749 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
400+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 18 air purifier filters we track - how the scorecard works · full air purifier filters data report. Confidence: medium - useful but incomplete evidence.Last refreshed Jun 15, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
This is a two-pack of genuine replacement filters for the PuroAir 400 air purifier, not a purifier itself. Each cartridge combines a pre-filter layer, a HEPA layer and an activated carbon layer that PuroAir calls CarbonTech. The manufacturer specifies replacement every 3 to 4 months.
Filter buying comes down to two questions: does it fit, and what does a year of ownership cost. On the first, this is the manufacturer's own part with an official seal, so fitment is not the gamble it can be with third-party cartridges. On the second, at roughly three changes a year per unit, the running cost is the real story and it is the single thing owners comment on most.
- Two-pack of PuroAir 400 replacement filters
- Three-layer pre-filter, HEPA and CarbonTech carbon
- Replacement interval 3-4 months per PuroAir
- Covered by PuroAir's 2-year warranty
Who it's for
For PuroAir 400 owners who would rather pay for the manufacturer part than risk an aftermarket cartridge sealing poorly. Households with pets, smoke exposure or heavy dust will hit the 3 to 4 month interval reliably. Anyone running several purifiers and watching annual cost should price third-party options first.
What buyers say
From Amazon customer reviews.
Buyers are consistent on two points that pull in opposite directions: the filters do visibly capture dust and the purifier runs quietly with no smell from new media, but almost every positive review adds a note about price. One buyer called them grossly overpriced while still rating the filtration highly, and another said they are not inexpensive but last a reasonable stretch. Installation draws no complaints at all, with several owners describing it as opening the back panel and dropping the cartridge in.
Strengths and trade-offs
Drawn from this product's published specifications.
- Genuine PuroAir part, so fitment is not a gamble
- Carbon layer targets odors, not just particulate
- Two cartridges cover roughly six to eight months
- Slides in without tools
- Costly per cartridge compared to generic filters
- Fixed 3-4 month interval adds up annually
- Fits the PuroAir 400 only
Performance notes
A combined cartridge works in stages: the outer pre-filter catches hair and lint so the HEPA media is not blinded early, the HEPA layer captures fine particulate, and the carbon layer adsorbs gas-phase odor molecules that HEPA media cannot hold. Carbon saturates on a schedule of its own, so a filter that still looks clean can stop controlling odor. That is why the 3 to 4 month interval matters more than visual inspection.
Specifications
| Brand | PuroAir |
|---|---|
| Model | PA400 |
| Dimensions & fit | |
| Item Weight | 1.7 pounds |
| Item Dimensions L x W x Thickness | 16.9 × 2.6 × 12.6 inches |
| Construction & materials | |
| Material Type | Activated Carbon, Polypropylene, Polyurethane |
| Air Filter Construction | Pleated |
| Compatibility & installation | |
| Compatible Air Purifier Models | PuroAir 400 air purifier |
| Included components | |
| Unit Count | 2 |
| Included Components | 2 PuroAir 400 Replacement HEPA Air Filters |
| Warranty & support | |
| Warranty Description | 30 days |
| Other details | |
| Number of Items | 2 |
| Common Applications | Allergen Reduction, High Strength, Odor Reduction |
| Product Grade | Proffesional Grade Filtration |
Other PuroAir air purifier filters
How it compares
This product against the closest alternatives we track in air purifier filters.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| PuroAir 400 Replacement FilterThis product | 4.8 / 5 | 749 | 4.2 / 5 |
| Levoit Vital 100 Air Purifier Genuine Replacement FilterLevoit | 4.8 / 5 | 6,200 | 4.5 / 5 |
| Honeywell HEPA Air Purifier Filter Replacement Kit for HPA300Honeywell | 4.8 / 5 | 4,505 | 4.5 / 5 |
| Core 300 Replacement Filter for LEVOIT Core 300Colorfullife | 4.7 / 5 | 3,000 | 4.2 / 5 |
| Nispira F1 C01 T02 HEPA Replacement Filter for 3M Filtrete Room Air Purifier FAP-C01-F1Nispira | 4.6 / 5 | 928 | 4.2 / 5 |
Similar air purifier filters from other brands
Questions about the PuroAir PA400
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How often should the PuroAir 400 filter be changed?
PuroAir specifies every 3 to 4 months. A two-pack therefore covers roughly six to eight months of continuous use in one purifier.
Will this fit any PuroAir model?
It is made for the PuroAir 400. Check the model number on your unit before ordering, since other PuroAir purifiers take different cartridges.
Is the carbon layer washable?
No. Activated carbon adsorbs odor compounds until it saturates and cannot be rinsed back to usable condition, which is why the whole cartridge is replaced.