Levoit LAP-B851S-WNA: CADR, room size and running cost
Smoke CADR 85 cfm · Room size 132 sq ft (ENERGY STAR) · 90 kWh/yr ≈ $16.48/yr electricity (estimate)
Certified specs
| Smoke CADR | 85 cfm |
|---|---|
| Dust CADR | 90 cfm |
| Pollen CADR | 109 cfm |
| PM2.5 CADR | 87 cfm |
| ENERGY STAR effective room size | 132 sq ft (1.55 × smoke CADR, per 10 CFR 429.68) |
| Annual energy use | 90 kWh/yr |
| Integrated energy factor | 5.6 cfm/W |
| Smoke CADR per watt | 5.86 cfm/W |
| Ozone emissions (reported) | 0 ppb |
| Technology | Fan and Filter |
| Filter types listed | HEPA |
| Automatic mode | None |
| Connected (app/Wi-Fi) | Yes (Wi-Fi) |
| ENERGY STAR Most Efficient | Yes |
| Markets | United States, Canada |
| Date certified | 2025-07-24 |
| ENERGY STAR partner | Arovast Corporation |
| Other model numbers ENERGY STAR lists as equivalent | LAP-B851S-****,LAP-B851S-****,* can represent different character or can be blank. |
| Source | ENERGY STAR record 4481120 · Product Finder page |
How many air changes per hour would it give?
Estimate: air changes per hour (ACH) = smoke CADR × 60 ÷ room volume, at the top fan speed used for the CADR test. Real-world ACH is usually lower (lower fan speeds, furniture, filter loading).
| Room | ACH, 8 ft ceiling | ACH, 9 ft ceiling | AHAM sizing |
|---|---|---|---|
| 100 sq ft | 6.4 | 5.7 | Meets AHAM 2/3 rule |
| 150 sq ft | 4.2 | 3.8 | Below AHAM 2/3 rule |
| 200 sq ft | 3.2 | 2.8 | Below AHAM 2/3 rule |
| 300 sq ft | 2.1 | 1.9 | Below AHAM 2/3 rule |
| 400 sq ft | 1.6 | 1.4 | Below AHAM 2/3 rule |
| 500 sq ft | 1.3 | 1.1 | Below AHAM 2/3 rule |
| 700 sq ft | 0.9 | 0.8 | Below AHAM 2/3 rule |
AHAM's 2/3 rule: choose a smoke CADR of at least 2/3 of the room's area (8 ft ceiling). By that rule this model suits rooms up to about 128 sq ft.
Estimated yearly electricity cost
| Where | Residential rate | Per year | Per month |
|---|---|---|---|
| Louisiana | 12.72¢ | $11.45 | $0.95 |
| U.S. average | 18.31¢ | $16.48 | $1.37 |
| California | 33.61¢ | $30.25 | $2.52 |
| Hawaii | 48.00¢ | $43.20 | $3.60 |
Estimate = 90 kWh/yr × rate. Rates: EIA Table 5.6.A, July 2026 (preliminary). Filter replacement cost is not included (data gap: not in ENERGY STAR data). Use your own rate and hours.
On battery during an outage (estimate): 90 kWh ÷ 5,840 active hours ≈ 15 W average, which runs slightly high because the annual figure includes standby. A 1,024 Wh portable power station at an assumed 85% inverter efficiency would run it about 56 h. Top fan speed can draw more. Try other stations in the runtime calculator on our power station site.
Similar CADR from other brands
| Model | Smoke CADR (cfm) | ENERGY STAR room size (sq ft) | Energy use (kWh/yr) | Est. electricity/yr* |
|---|---|---|---|---|
| Blueair 4612522000 | 82 | 127 | 30 | $5.49 |
| Blueair 3131000100 | 80 | 124 | 43.67 | $8.00 |
| Blueair 1831022000 | 90 | 140 | 75 | $13.73 |
| Medify Air MA-14 | 75 | 116 | 86 | $15.75 |
| Clorox Type AP40 | 79 | 122 | 88 | $16.11 |
| Dreo DR-HTF022S | 90 | 140 | 102 | $18.68 |
| Bosch Air 2000 | 86 | 133 | 104 | $19.04 |
*Estimate: ENERGY STAR annual kWh × U.S. average residential rate 18.31¢/kWh (EIA, July 2026 (preliminary)). ENERGY STAR's annual figure assumes 16 hours/day of operation under the DOE test procedure.
Compare this model side by side with any other · All Levoit models
See Levoit air purifiers on the manufacturer's site (plain link, not an affiliate link)
We have not tested this product. Figures are as listed in ENERGY STAR data retrieved 2026-10-17.