Field Controls TRIO Plus S
Room air purifier · suggested up to 507 sq ft · True HEPA (H13) + activated carbon
A room air purifier rated to clear 327 CFM of smoke-sized particles — enough for a room up to about 507 sq ft.
Buy this purifier
Find it on Amazoncurrent price & sellers vary by listing
Field Controls TRIO Plus S room air purifier
Find it on Amazon →Affiliate link. We may earn a commission — it never changes your price or our specs. Opens an Amazon search for this exact model.
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 327 — 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 94%
of the 218 units with a published smoke CADR
Suggested room size
Better than 94%
of the 218 units with a published room size
Compare similar air purifiers
Frequently asked questions
How big a room does the Field Controls TRIO Plus S cover?
AHAM suggests it for a room up to 507 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 Field Controls TRIO Plus S?
Its AHAM Clean Air Delivery Rate is 342 for dust, 327 for smoke and 386 for pollen, with a PM2.5 CADR of 335. CADR is cubic feet of clean air delivered per minute — higher clears a room faster.
Does the Field Controls TRIO Plus S use a real HEPA filter?
Its filter is listed as True HEPA (H13) + activated carbon. True HEPA captures 99.97% of particles down to 0.3 microns. The activated-carbon layer also helps with odors and gases.
How much power does the Field Controls TRIO Plus S use?
About 88.2 watts on its smoke-clearing setting, which works out to 3.7 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 Field Controls TRIO Plus S?
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.