Alen T100 Desktop HEPA Air Purifier Quick Review

The smallest and most compact Alen air purifier tower series, the Alen Desktop HEPA Air Purifier T100 is specially developed for desktop/ table use notably in an office cubicle or a room. Without skimming too much of its features, the Alen T100 Desktop HEPA also comes with the renown lifetime warranty, easy change filter slot and is Energy Star certified. Through the standard 3 layers filtration, Alen T100 Desktop HEPA air purifier also offers decent filtration against common airborne pollutants and light gases/ odors but the question is, will this air cleaner live up to our expectation? Let’s find out.
± 169 p
     Annual filter ^    
± 33 - 98 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 T100 Specification

ProductAlen T100
15.2 x 38.1 x 25.4 in
(38.6 x 96.8 x 64.5 cm)
Weight8 lb (3.6 kg)
Coverage (up to)125 sq. ft. (12 m2)
Airflow speed67 cfm (114 - 0 m3/h)
Dust free (CADR)
Pollen free (CADR)
Smoke free (CADR)
- Lifespan
- Replacement cost ($)
HEPA filter
- Lifespan
- Replacement cost ($)
6 months
Carbon filter
- Lifespan
- Replacement cost ($)
Ionizer/ TechnologiesIonizer
UV-light/ PCO
Other filter
All-in-one filter
- Lifespan
- Replacement cost ($)
Optional/ Addon
HEPA-Silver Filter TF30-Silver
6 - 18 months+- $69
HEPA-OdorCell FilterTF30-MP
6 - 18 months+- $89
HEPA-Fresh Filter TF30
6 - 18 months+- $59
Noise level43 - 60 dBA
Power usage level30 W
Timer/ Scheduler
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

  • 3-stage filtration
  • Washable pre-filter
  • HEPA-Fresh filter
  • 4 fan speeds with auto mode
  • SmartSensor Technology (AQ sensor)
  • 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


  • Low entry price.
  • Extremely portable. Able to fit in most luggage.
  • Comes with a pre-filter that will extend the HEPA filter usage life.
  • Nearly zero sound on speed 1 or 2 setting. Only fan white noise at speed 3 setting.
  • Very low energy consumption at only 30 watts maximum per hour.
  • Hassle-free filter change design.
  • Protected by a lifetime limited warranty.


  • Weak airflow performance/ applicable area.
  • No filter change indicator.
  • No stand-alone deodorization filter. Optional filters purchase is required.

The smallest among the group, The Alen T100 air purifier is even shorter than the already compact Alen T500. With a much smaller size, the unit is also lighter thus perfect for someone who needs a small air purifier on their work-space/ desk. Constructed in a black plastic housing with dual sides/ back air vent, expect great airflow circulation within its capable boundaries. Last but not least, there is a digital display with a clear, intuitive control panel at the top of the air purifier; similar to Alen T500 layout. Rounding the spec list is You also have an Auto-off safety feature that disables the unit when the front cover is open, ETL and UL listed, Energy Star certified and lifetime warranty.

Applicable area, airflow, noise level and power input

If there is a trade for such a compact, portable size, this section will probably be it. At only 12 m2 (125 sq. ft.) with 2 charges of air, Alen T100 will fit in great at office desk or table that is close to the intended target. Despite the limitation, the 3-stage filtration Alen T100 filters are great in removing common allergens such as dust, mold, pollen and pet dander with up to a maximum of 113 m³/h airflow delivery. The noise level is uncharacteristically similar to Alen T500 that offer almost double of the airflow performance. Nevertheless, it is still low between 42.5 dB to 53 dB. Power consumption is the lowest in the group; only 30 watts used hourly.

Final thoughts on Alen T100

To sum up, Alen T100 is a compact, portable and very affordable HEPA Air Purifier. Being a HEPA air purifier, it is great at dealing with airborne pollutants and allergens at a specific range. The emphasis should be upon the keywords “specific range.” The T100 has a weak airflow performance and that has contributed to a low purifying applicable area. With that being said, Alen T100 air purifier greatest value would probably be the portability of the product where you could easily bring it along during travel or a long visit to an allergy season area. Not too bad after all.

At what cost

Alen T100 MRSP/ RSP
+- 169
Alen T100 annual filter replacement cost
Annual Filter Cost
+- 33 - 98
^ 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 T100 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 T100

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 T100 Desktop 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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