Alen A375 HEPA Air Purifier Quick Review

Not the most attractive looking air purifier, Alen A375 HEPA manage to retain its robust airflow with plenty of add on you would fancy. With extra focus on practicality, majority owner that used Alen A375 HEPA would appreciate the convenience this air purifier bring. Compare with its applicable area, airflow output, size, power consumption, and noise level, so what are the superb features of Alen A375 HEPA and how is the airflow applicable area? Without the need of introduction, learn about our air purifier review below.
± 599 p
     Annual filter ^    
± 69 - 138 p
 Online price*
** MRSP (Manufacturer's Suggested Retail Price)/ RSP (Retail selling price) is provided by cleanairprice.com. Accurate at the time of posting.
^ Annual filter cost is calculated based on filter price and 12 hours of usage. Pricing could vary depending on air quality, usage frequency, and speed.

Alen A375 Specification

ProductAlen A375
17.5 x 18.5 x 8 in
(44.5 x 47 x 20.3 cm)
Weight19 lb (8.6 kg)
Coverage (up to)650 sq. ft. (60 m2)
Airflow speed32 - 178 cfm (54 - 302 m3/h)
Dust free (CADR)
Pollen free (CADR)
Smoke free (CADR)
- Lifespan
- Replacement cost ($)
HEPA filter
- Lifespan
- Replacement cost ($)
6 - 12 months
+- 69
Carbon filter
- Lifespan
- Replacement cost ($)
Ionizer/ TechnologiesIonizer
UV-light/ PCO
Dual UV lamps
Other filter
All-in-one filter
- Lifespan
- Replacement cost ($)
Optional/ Addon
HEPA-Silver Filter BF25A-SILVER
6 - 12 months+- $79
HEPA-OdorCell Filter BF25A-MP
6 - 12 months+- $89
Noise level38 - 65 dB
Power usage level104 W
Timer/ Scheduler8 hours
Auto mode
Air qualityAQ indicator
Filter change indicator
More color options
Wi-Fi/ BTBluetooth
Remote control
Child lock
WarrantyLifetime Limited Warranty
Email/ Phone support

Key features

  • 4-stage filtration
  • Washable pre-filter
  • Better HEPA-Fresh filter (0.3 microns grade)
  • 4 fan speeds (Low, medium, high, turbo) with auto mode
  • Advanced SmartSensor – Monitors nearby airborne pollutants including dust and odor
  • Wall-mountable slot
  • 2 UV lamps and Photo Catalytic Oxidation (PCO) Technology
  • Selectable up to 12 hours timer
  • [Optional] filters - HEPA-Silver Filter (excellent against common pollutants) or HEPA-OdorCell Filter (Excellent against gases and odor)
  • Lifetime limited warranty


  • Wide purifying applicable area. Great for living hall or even studio apartment.
  • Pre-loaded with HEPA-fresh filter.
  • Built-in Smartsensor + Auto mode.
  • Comes with wall-mountable slot.
  • Pre-set timer (up to 12 hours of airflow circulation).
  • Ionizer and UV lamp could be turn on or off by personal preference.
  • Lifetime warranty.


  • Outdated design. (Discontinued in most area)
  • Additional filter purchase such as HEPA-Silver filter and HEPA-OdorCell filter is needed against bacteria, odor and viruses.
  • Loud fan noise on higher speed.

Not exactly the most striking design, the white covered plastic is sturdily constructed with side air intake surrounding Alen A375 UV. Considerably compact compare with modern air purifier, Alen A375 UV UV multi-gas air purifier is much smaller (shorter to be exact) and slimmer than Alen BreatheSmart model. Even so, it is still packed with all the standard features you would find in any of the series. Weight is on the heavy side, nevertheless, you could still carry this unit around by grabbing on the back handle or even hang it by the wall with the available wall-mount slot. A blue color digital display with buttons is located at the front panel. You also have a filter life timer which detects the filter lifespan based on the filter used. Other than that, Alen A375 UV comes with Auto-off safety feature that disables the unit from functioning when the front cover is open, ETL (Edison Testing Laboratory) and UL (Underwriters Laboratories Inc) listed<, Energy Star certified and lifetime warranty.

Applicable area, airflow, noise level and power input

With 2 charges of air distribution, Alen A375 UV offers a respectable 60m2 or 650 sq. ft. of air-purifying applicable area. Airflow delivery rate is good too, with the pairing of pre-filter, HEPA-Fresh filter and ionizer, the air purifier can deliver between 55 m³/h to 297 m³/h airflows. Thanks to its WhisperMax technology that curb the noise sound, the noise level is at a standard level between 38 dB to 64.3 dB. Finally, the power input level for Alen A375 UV is slightly high if compared with Alen A350; at 104 watts on the high-speed setting.

Final thoughts on Alen A375 UV

Alen A375 UV HEPA Air Purifier is a fantastic option for someone that is looking for an air cleaner to remove common allergens and household odors. Compared with its sibling the A350, Alen A375 UV comes with additional UV lamp which is good against gases, odors, and remote control. However, it has to trade-off with weaker air circulation and airflow applicable area that might be critical of some. Both models also come with standard Advanced SmartSensor technology and filtration. If you are stuck between the 2 choices, I would suggest you go with the cheaper option.

At what cost

Alen A375 MRSP/ RSP
+- 599
Alen A375 annual filter replacement cost
Annual Filter Cost
+- 69 - 138
^ Replacement filters/ estimated cost
SPA-550A is the least expensive in Rabbit Air BioGS and MinusA2 series; not so much so when compared with other similar high purifying range air purifiers from Winix, Honeywell. While CADR figures are not overly impressive, you do receive a great deal of premium features as standards like Auto mode, air quality sensor, timer and remote control (with holder). On the other end, annual filter replacement cost is close to flawless as the filter lifespan is lengthy (up to 3 years) and can be purchased in a bundled replacement kit. For the filter maintenance factor alone, Rabbit Air SPA-550A will be well worth the purchasing price in long-run.
As mentioned earlier, competitors model like Winix NK105/ HR1000, Alen BreatheSmart series or Blueair 205 offer wider purifying coverage and better CADR with a cost. If you already decided on BioGS 2.0, Rabbit Air SPA-550A has a fixed price regardless from channels like Bestbuy, Overstock or official website. As we are part of Amazon affiliate, you can support us by purchasing from Amazon that comes with free shipping and 30-day no questions asked return policy. Alternatively, you can consider purchasing from Rabbit Air's website (again no discount) that add the merits of 90-day money back guarantee and stock availability assurance. Finally, all official, non-import Rabbit Air purchase comes with 24x7 technical support/ customer service and a 5 years official manufacturer warranty.

Alen A375 VS the challengers

Rabbit Air BioGS 2.0 SPA-625A

Rabbit Air BioGS 2.0 SPA-625A

As the model name rightly pointed, this is the higher version of BioGS series that offers better airflow performance and coverage (625 VS 550 sq.ft.) with a minor price increase. Everything else is exactly the same.
Honeywell HPA300

Honeywell HPA300

Another popular alternative in the list, Honeywell HPA300 is cheaper with better CADR performance than Rabbit BioGS. In long-run though, the higher filter replacement cost and less filtration depth might come back to haunt you.
Rabbit Air MinusA2 SPA-700A

Rabbit Air MinusA2 SPA-700A

Space-friendly, swappable front panel, 6-stage filtration (medium + customized filter), wider purifying coverage and of course better overall CADR. Rabbit Air MinusA2 is no doubt the upgrade both aesthetically and functionality at a premium cost.
Winix 5500-2 PlasmaWave

Winix 5500-2

Our highly recommended air purifier that is well-rounded in terms of pricing with performance ratio. Winix 5500-2 also has an identical setup as Rabbit BioGS in dimension, practicality features and filtration performance. The main differences between the 2 are BioGS has a much lower filter maintenance cost while 5500-2 gain a much lower price point.

Final thoughts on Alen A375

If you are looking for an air purifier that will do a fantastic job in alleviating common household pollutants, smokes and odors, look no further. As the positive review clearly outweigh the cons in Amazon reviews, 92% of them leave an exceedingly positive 4 – 5 stars. Users like Rabbit Air SPA-550A top-notch build quality, consistent performance with effective four-stage filtration, reliable customer service and economical operating cost from the prolong filters lifespan. The remaining 5% that leave a neglectable 1 - 2 stars is experiencing poor filtration performance mainly on smoke and odors. If we have to pick a bone with this air purifier, its older brother (SPA-625A) offers a better deal in terms of price ratio.

Verdicts and ratings

Build quality
Particle Filtration
Smoke Filtration
Alen A375 HEPA Air Purifier

Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.

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