Description
Coway Noble Air (AP-2021A) at a Glance
* Filter performance based on manufacturer test conditions. Actual purification performance may vary with room layout, pollution levels, ventilation, and usage conditions.
Key Features
Architectural Design That Complements Any Room
The straight-lined tower design in Pebble Gray sits naturally in living rooms, dining areas, offices, and more.
Hidden Display That Appears Only When Needed
The controls and display are neatly arranged on the top panel — check and adjust operating mode, airflow, fan speed, and air quality info all in one place.
360° Purification with 4-Sided Intake
The 4D structure draws polluted air from all four sides, pulling surrounding air in broadly without relying on one direction for efficient purification.
Real-Time Air Quality with the PM1.0 Sensor
The PM1.0 sensor detects indoor particle levels and provides an intuitive air quality display for quick checks of your current indoor air.
Specifications
| Model | AP-2021A |
|---|---|
| Product Type | Mid-to-large premium air purifier |
| Coverage Area | 1,103 ft² at 2 ACH / 2,205 ft² at 1 ACH |
| Dimensions | 12.6 × 12.6 × 31.7 in |
| Weight | Approx. 33.07 lb |
| Filter Configuration | 4D Pre-Filter → Indoor Fume + Double Deodorization → Deodorization → 4D Particulate |
| Intake | 4-sided intake · 360° air circulation |
| Airflow | Full Circulation · Front Focus · Rear Indirect |
| Sensor | PM1.0 real-time air quality sensor |
| Color | Pebble Gray |
Filters & Replacement Schedule
| Filter | Primary Role | Recommended Replacement | Price |
|---|---|---|---|
| 4D Pre-Filter | Captures hair, large dust, and other large particles | Wash regularly | — |
| Indoor Fume Filter | Manages gaseous substances such as formaldehyde and ammonia | 4–6 months | $35 |
| Double Deodorization Filter | Secondary control of everyday odors and gaseous pollutants | 4–6 months | $35 |
| Deodorization Filter | Activated-carbon-based control of household and cooking odors | 24 months | $70 |
| 4D Particulate Filter | Captures ultrafine particles | 12 months | $140 |
Replacement cycles and prices per the Coway USA official Filters Shop as of September 2026, for AP-2021A-compatible filters. Actual replacement timing may vary with usage hours and indoor pollution; prices are subject to change.
Rental & Purchase Pricing
| Term | In-Home Maintenance | Self-Maintenance Standard |
|---|---|---|
| 6-Year Rental | $43.99 / month | $39.99 / month |
| 5-Year Rental | $48.99 / month | — |
| 3-Year Rental | $53.99 / month | $49.99 / month |
| One Pay | $1,499 | — |
Rental and lump-sum promotions May vary by period. Check currently available offers.
View This Month's Promotions →Regular rates shown. A special September 2026 promotion on AP-2021A rental and one-time purchase is running separately — please check the promotions page or your consultation for actual pricing. Extended self-maintenance rates excluded.
Recommended For
For Those Managing Large Living Rooms & Open Spaces
Its 1,103 ft² coverage at 2 ACH works well for managing air in connected spaces like living and dining rooms.
For Those Who Want to Adjust Airflow to the Situation
The Air Pop-Up design lets you choose full circulation, front-focused, or rear indirect circulation.
For Those Who Want Performance & Interior Style
A great fit for spaces that want air-care features like the 4D filter and PM1.0 sensor wrapped in a premium tower design.
Frequently Asked Questions
What is the recommended room size for the Noble Air (AP-2021A)?
Per the current CowayCA product page and U.S. sales materials: 1,103 ft² at 2 ACH (2 air changes per hour) and 2,205 ft² at 1 ACH. Perceived performance may vary with room layout, ceiling height, ventilation, and pollution levels.
What filters does it use?
It uses a 4D filter system: 4D Pre-Filter, Indoor Fume Filter, Double Deodorization Filter, Deodorization Filter, and 4D Particulate Filter.
What are the filter replacement cycles and prices?
Per the Coway USA official sales page as of September 2026: Particulate Filter 12 months/$140, Deodorization Filter 24 months/$70, Double Deodorization Filter 4–6 months/$35, Indoor Fume Filter 4–6 months/$35. The 4D Pre-Filter is maintained by washing.
What are the advantages of 4-sided intake?
Designed to draw indoor air from all four sides — no reliance on a single direction — pulling surrounding air in broadly for effective circulation.
Can I also adjust the direction of airflow?
Yes. The Air Pop-Up design lets you direct purified air with Full Circulation, Front Focus, Rear Indirect, and more to suit your space and situation.
How do I check the indoor air quality?
The PM1.0 sensor detects indoor particle levels, and you can intuitively check current conditions through the top display and air quality indicator.
What are the dimensions and weight?
It measures 12.6 × 12.6 × 31.7 inches and weighs about 33.07 lb.
How much are the rental and one-time purchase prices?
In-home maintenance: $43.99/mo for 6 years, $48.99/mo for 5 years, $53.99/mo for 3 years. Self-maintenance Standard: $39.99/mo for 6 years, $49.99/mo for 3 years. One-time regular price: $1,499. Actual pricing may vary with taxes and promotions.
Recent Installation Areas
These are areas where customers have had this product installed. Only cities are shown to protect customer privacy.
- Flushing, NY
- Los Angeles, CA
- Montrose, CA
- Westmont, IL
- NY
- CA
- IL
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