Description
Coway Square Fit Air Purifier (AP-1125G) at a Glance
* Lowest noise per manufacturer specifications. Perceived noise and performance may vary with operating mode, placement, and usage environment.
Key Features
Smart Mode That Adjusts to Air Quality on Its Own
Automatically adjusts fan speed to real-time air quality. The unit's 4-color LED display also shows current indoor air quality at a glance.
4-Stage Filter for Particles & Odors
Applies the Pre-Filter, Double Deodorization Filter, Deodorization Filter, and Particulate Filter in sequence to tackle everything from large dust to odors and fine particles.
Ultra-Quiet Sleep Mode as Low as 20dB
Use low-noise operation at bedtime — great for bedrooms, kids' rooms, and studies where quiet matters.
7.2-Inch Slim Design for Space Efficiency
Its slim, roughly 7.2-inch-deep form sits unobtrusively near walls or furniture. Available in White and Sage Green.
Specifications
| Model | AP-1125G |
|---|---|
| Product Type | Square Fit air purifier for small to mid-size spaces |
| Coverage Area | 2 ACH: 686 ft² (64 m²) / 1 ACH: 1,373 ft² (128 m²) |
| Filter Configuration | Pre-Filter · Double Deodorization Filter · Deodorization Filter · Particulate Filter |
| Modes | Smart Mode · Eco Mode · Ultra-Quiet Sleep Mode |
| Air Quality Display | Real-time 4-color LED Air Quality Indicator |
| Size | 14.4 × 7.2 × 19.7 in (W × D × H) |
| Weight | Approx. 15.4 lb |
| Color | White · Sage Green |
Coverage areas assume 8-ft ceilings and are ACH-based: 2 ACH purifies the room's air roughly once every 30 minutes; 1 ACH, roughly once every 60 minutes.
Filters & Maintenance
| Filter | Role | Replacement & Care Cycle | Official Price |
|---|---|---|---|
| Pre-Filter | First-stage capture of large dust, hair, and more | Wash and clean regularly | No separate replacement confirmed |
| Double Deodorization Filter | Everyday odor control | Not listed on the AP-1125G official product page | No dedicated Coway USA listing confirmed |
| Deodorization Filter | Odor and gas management | Not listed on the AP-1125G official product page | No dedicated Coway USA listing confirmed |
| Particulate Filter | Captures fine particles | Not listed on the AP-1125G official product page | No dedicated Coway USA listing confirmed |
Based on our September 2026 review of Coway USA's official product and filter pages. We could not confirm an official listing with individual sale prices and recommended replacement cycles for AP-1125G-specific replacement filters, so no assumed prices or cycles are listed.
Purification Performance & Quiet Operation
| Particle Performance | Coway's U.S. product page notes 0.01μm particle removal performance. Performance may vary with test conditions and actual usage environments. |
|---|---|
| Smart Mode | Automatically adjusts fan speed based on real-time air quality |
| Eco Mode | Designed to adjust fan operation while air stays clean, reducing unnecessary energy use |
| Quiet Mark | The AP-1125G is listed as a Quiet Mark certified product, with Sleep Mode noise as low as 20dB per the manufacturer. |
Rental & Purchase Pricing
| Service Plan | Term | Standard Regular Rate |
|---|---|---|
| In-Home Maintenance | 6 Yrs | $34.99 / month |
| In-Home Maintenance | 5 Yrs | $39.99 / month |
| In-Home Maintenance | 3 Yrs | $42.99 / month |
| Self-Maintenance | 6 Yrs | $30.99 / month |
| Self-Maintenance | 3 Yrs | $38.99 / month |
| One Pay | — | $999 |
Rental and lump-sum promotions may change by period. Check currently available offers.
View This Month's Promotions →Confirmed regular rates as of September 2026; taxes not included. Extended regional rates excluded — Standard only. Please confirm promotion availability and final order pricing during your consultation.
Ideal Spaces
Bedrooms, Kids' Rooms & Studies
The 20dB-at-lowest Sleep Mode and slim depth balance quiet operation with space efficiency.
Mid-Size Living Rooms & Open Living Spaces
With 686 ft² of coverage at 2 ACH, it works in living spaces larger than a bedroom too.
For Households That Prefer Automatic Operation
Smart Mode and the 4-color air quality display take the hassle out of manually checking and adjusting air conditions every time.
Frequently Asked Questions
What is the recommended room size for the AP-1125G?
Per Coway USA: 686 ft² (64 m²) at 2 ACH and 1,373 ft² (128 m²) at 1 ACH. 2 ACH means the room's air is purified roughly once every 30 minutes.
What filters does the AP-1125G use?
It uses a 4-stage filter system: Pre-Filter, Double Deodorization Filter, Deodorization Filter, and Particulate Filter.
Does the fan speed change automatically with air quality?
Yes. Smart Mode automatically adjusts fan speed based on real-time air quality, shown on the unit's 4-color LED air quality display.
Can I use it in a bedroom?
Per the manufacturer, the Ultra-Quiet Sleep Mode runs as low as 20dB. Perceived noise may vary with fan speed, placement, and surroundings.
What are the dimensions and weight?
It measures about 14.4 × 7.2 × 19.7 inches and weighs about 15.4 lb.
What colors are available?
U.S. sales materials list White and Sage Green. Actual orderable colors may vary with stock.
Where can I check replacement filter prices and schedules?
We could not confirm a standalone listing with model-specific prices and replacement cycles for AP-1125G replacement filters in Coway USA's current official filter catalog. Rental customers should follow their service schedule; self-maintenance and one-time-purchase customers should confirm the latest filter info when ordering.
How much are the rental and one-time purchase prices?
At regular rates: in-home maintenance $34.99/mo for 6 years, $39.99/mo for 5 years, $42.99/mo for 3 years; self-maintenance $30.99/mo for 6 years, $38.99/mo for 3 years. One-time regular price $999, taxes not included.
