Blueair 4431311000(Blue signature SP3i)(ROW)
Room air purifier · suggested up to 498 sq ft · HEPA-Type + activated carbon
A room air purifier rated to clear 321 CFM of smoke-sized particles — enough for a room up to about 498 sq ft.
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Blueair 4431311000(Blue signature SP3i)(ROW) room air purifier
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At a glance
Who it's for
Large living rooms and open-plan spaces that need real air-cleaning power.
The standout number
Smoke CADR of 321 — the number that decides how fast it clears wildfire smoke and fine particles.
The catch
The carbon filter that handles odors and gases wears out faster than the HEPA — budget for replacements.
The Verified Label — every AHAM-tested spec
not ENERGY STAR
US market
Clean Air Delivery Rate (CADR) — source: AHAM
Coverage & power — source: AHAM (+ computed)
Filter & identity
How it ranks
Where this unit sits among the 218 room air purifiers we track, on the two numbers that decide one: how fast it clears fine smoke particles, and how big a room it covers. Percentiles are computed from our corpus (higher = better).
Smoke CADR
Better than 92%
of the 218 units with a published smoke CADR
Suggested room size
Better than 92%
of the 218 units with a published room size
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Frequently asked questions
How big a room does the Blueair 4431311000(Blue signature SP3i)(ROW) cover?
AHAM suggests it for a room up to 498 square feet. That rating assumes it runs on high and cleans the air about 4.8 times an hour. For faster cleaning — say for wildfire smoke or allergies — size it to a smaller room than the maximum.
What is the CADR of the Blueair 4431311000(Blue signature SP3i)(ROW)?
Its AHAM Clean Air Delivery Rate is 309 for dust, 321 for smoke and 330 for pollen, with a PM2.5 CADR of 315. CADR is cubic feet of clean air delivered per minute — higher clears a room faster.
Does the Blueair 4431311000(Blue signature SP3i)(ROW) use a real HEPA filter?
Its filter is listed as HEPA-Type + activated carbon. "HEPA-Type" is not the same as true HEPA — it captures fewer of the smallest particles. The activated-carbon layer also helps with odors and gases.
How much power does the Blueair 4431311000(Blue signature SP3i)(ROW) use?
About 30.4 watts on its smoke-clearing setting, which works out to 10.6 CADR per watt — a measure of how much clean air you get for the electricity it draws. It is not ENERGY STAR certified.
Where can I buy the Blueair 4431311000(Blue signature SP3i)(ROW)?
It's a retail unit, so the fastest way to find it is to search for the exact model on Amazon and compare current sellers and price. The replacement filters are the recurring cost — check those before you commit to a brand.
Sources. Clean Air Delivery Rate (dust / smoke / pollen), PM2.5 CADR, suggested room size, ENERGY STAR status and power draw come from the AHAM Verifide air-cleaner directory (the industry's independent CADR test). Average CADR, clean-air-per-watt and the percentile figures are computed by Verified HVAC Data from those published ratings. We publish no star ratings and take no payment for placement. "Not published" means AHAM's record doesn't disclose it — we never fill a spec with a guess.