Stadler Form Roger Big
No store we follow ships this model to the United States. This page says what it can do, and which similar robots you can buy here.
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Before you buy, compare it with 2 recommended alternatives
No store here sells this model today, so beside it the highest-scored model for the same room size that one does, and the cheapest of the top 10.
Green is the best of these 3, also when they share the lead.
| This model Stadler Form Roger Big | Highest score here Blueair Blue Pure 311i Max Best on 2 facts | Cheapest of the top 10 Blueair Blue Pure 311i+ Max | |
|---|---|---|---|
| Price and ranking | |||
| The lowest price today at a store that ships to you, shipping included. A price with an asterisk comes from a store abroad, and its shipping cost is our own estimate. Lowest price | – | $229Blueair (brand store) best | $254Blueair (brand store) |
| Our own score out of 10: 60% measured facts and 40% store ratings. Price does not count. Score | not in our ranking | ||
| Where the model stands in our ranking, among the purifiers for the same size of room. Rank | – | rank 2 of 11 for open-plan spaces | rank 3 of 11 for open-plan spaces |
| The average of the stars buyers give at the stores, with the number of reviews behind it. We only compare it from 20 reviews. Customer rating | – | – | – |
| Room size | |||
| The size of room the purifier suits, with the largest room the maker names for it. Room size same on all | open-plan spaces | open-plan spacesup to 439 ft² | open-plan spacesup to 525 ft² |
| Size, noise and age | |||
| How tall the purifier is. It decides whether it fits on a shelf or under a window sill. In this comparisonWhen it matters
Source
| – | 19 in (48.3 cm) best | 21 in (53.3 cm) |
| The month the model first went on sale. It shows how old the technology in it is. On the market since | – | December 2024 | April 2025 |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
Stadler Form Roger Big specifications
The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.
Also sold or tested as: SF-R-018 (Europe) source
Cleaning performance 3 facts
- Clean air delivery rate (CADR)
Among the models we track
433 cfm (736 m³/h) on this model
Lowest
15 cfm (25 m³/h) Highest
600 cfm (1,019 m³/h) Middle
177 cfm (300 m³/h)Higher than 158 of the 164 models we track.
When it matters
- A large living room or an open-plan space.
- Clearing the air quickly after cooking, smoke or a window opened in pollen season.
- In a small bedroom most purifiers keep up on a low setting.
Source: stadlerform.com · checked on Oct 25
How much clean air the purifier delivers an hour, measured with smoke, dust and pollen. A higher figure cleans a bigger room or the same room faster.
- 433 cfm (736 m³/h)
- CADR measured to
Source: stadlerform.com · checked on Oct 25
The test the CADR comes from. AHAM AC-1 and the DOE test are independent and comparable. A maker's own test is not.
- Not stated
- Room size we compare on
Among the models we track
660 ft² (61 m²) on this model
Lowest
23 ft² (2 m²) Highest
915 ft² (85 m²) Middle
269 ft² (25 m²)Higher than 158 of the 164 models we track.
When it matters
- Choosing a purifier for one room you know the size of.
- Rooms with a high ceiling, which hold more air than the floor area suggests.
- In a room well under the stated size, any model in the list will do.
Source: derived, no source of its own · checked on Oct 25
The room size where the purifier changes the air 4.8 times an hour under a 2.5 m ceiling, worked out from its CADR. We use it so every model is compared on the same rule.
- 660 ft² (61 m²)
Filter 2 facts
- HEPA filter class
When it matters
- Allergy to pollen, dust mites or pet dander.
- Fine dust from traffic, wood stoves or wildfire smoke.
- For smells alone the particle filter’s class decides little: the carbon filter does that work.
Source: stadlerform.com · checked on Oct 25
How fine the filter is. True HEPA and H13 catch at least 99.97% of particles at 0.3 microns. HEPA-type is a weaker claim with no test behind it.
- H12 HEPA
- Activated carbon filter
129 of the 132 models we track have this.
When it matters
- Cooking smells, smoke and pet odors.
- Gases from new furniture, paint or cleaning products.
- Against pollen and dust alone it adds nothing.
Source: stadlerform.com · checked on Oct 25
A filter of activated carbon that takes out smells and some gases. It does not catch particles.
- yes
Noise and power 3 facts
- Noise at the lowest speed
Among the models we track
26 dB on this model
Lowest
10 dB Highest
50 dB Middle
24 dBHigher than 85 of the 128 models we track.
When it matters
- A bedroom, where it runs while you sleep.
- A home office or a quiet room where it runs all day.
- In a busy living room with the TV on you will hardly hear the low setting.
Source: stadlerform.com · checked on Oct 25
The sound level at the lowest speed, as the maker measures it.
- 26 dB
- Noise at the highest speed
Among the models we track
58 dB on this model
Lowest
30 dB Highest
70 dB Middle
53 dBHigher than 101 of the 137 models we track.
When it matters
- Clearing the air fast, which needs the top speed.
- Open-plan spaces where sound carries.
- If you only run it on its low settings the top figure hardly matters.
Source: stadlerform.com · checked on Oct 25
The sound level at the highest speed, as the maker measures it.
- 58 dB
- Power at the highest speed
Among the models we track
90 W on this model
Lowest
3 W Highest
2,200 W Middle
45 WHigher than 131 of the 144 models we track.
Source: stadlerform.com · checked on Oct 25
The power the purifier draws at its highest speed.
- 90 W
Build 1 fact
- Weight
Among the models we track
23.1 lb (10.5 kg) on this model
Lowest
0.7 lb (0.33 kg) Highest
169.8 lb (77 kg) Middle
11.7 lb (5.3 kg)Higher than 136 of the 154 models we track.
When it matters
- Moving the purifier from room to room, up and down the stairs.
- A shelf or a table that has to bear it.
- If it stays in one place it hardly matters.
Source: stadlerform.com · checked on Oct 25
What the purifier weighs. It counts most if you move it from room to room.
- 23.1 lb (10.5 kg)
Warranty and certification 1 fact
- Warranty
Among the models we track
2 years on this model
Lowest
1 year Highest
5 years Middle
2 yearsHigher than 16 of the 90 models we track.
When it matters
- A robot with a dock full of pumps and moving parts, where more can break.
- An expensive robot you plan to keep for years.
- For a cheap robot you would replace rather than repair, the extra years count for less.
Source: stadlerform.com · checked on Oct 25
The warranty the maker gives in the United States.
- 2 years
Sources: stadlerform.com
The maker
Stadler Form
- Headquarters: Switzerland
- Founded in 1998
Stadler Form is a Swiss maker of air treatment products. Martin Stadler founded it in Zug in September 1998 after he could not find a humidifier that met his standards, and it is still based there. The company says it works with partners in more than 50 countries.