forum threadllxphatxll posted Oct 06, 2025 06:29 PM
Item 1 of 2
Item 1 of 2
forum threadllxphatxll posted Oct 06, 2025 06:29 PM
Air Purifiers for Home Large Room, Cover Up to 2600 Ft² with Washable Filters, Powerful Turbo Mode, PM2.5 Air Quality Display, 22dB Sleep Mode, Air Cleaner for Pets Hair, Smoke, Od
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- H13 instead of H14 = 10x less promised filtration
- Thin sprayed on charcoal coated mesh instead of large pellets in thicker honeycomb frame = way less impactful at removing smells
- 1 sided entry instead of dual sided for more of these rectangular units that have sold for about $57 (with 2 H14 filters included at that price)
- Only 4 listings total showing replacement H13 filter with charcoal mesh $20-$22 for 1x, $30 for 2x. For the similar AP303/304 filters for the other dual-sided intake units out there -- there are over 25 listings and prices are $23 for 2x to $41 for 4x and again those have the better pellet for smell removal and some are H14. (You can run those leaving one side sealed in bag if you want to reduce your filter cost if you don't have as large of a room or as dirty air to save money)
At least it has an abundance of air flow holes and the removable, washable metal screen pre-filter and PM2.5 sensor/auto mode. I'd pay $39 for this over a $19-$29 round tiny one without auto/sensor. But I'd pay $18 more for a better one as noted above as the reasons why.Assumptions (so we're explicit)
1. Manufacturer "coverage" claims (the inconsistent ones we found) are interpreted as area cleaned once per hour (1 ACH) — i.e., the claim = square feet that get one air change per hour.
2. Standard ceiling height = 8 ft (if your ceiling differs, multiply/divide final CADR by your height ÷ 8).
3. CADR formula used:
CADR (cfm) = (area in sq ft × ceiling height in ft × ACH) ÷ 60
For 1 ACH this simplifies to: CADR = (area × 8) ÷ 60 with our 8-ft assumption.
4. Real purifiers lose airflow because of filter resistance. I present three scenarios for how much of the theoretical airflow remains as effective CADR: conservative 60%, typical 75%, optimistic 90%.
> I'll compute for the three common coverage claims we saw: 2,600 sq ft, 1,420 sq ft, and 538 sq ft.
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Exact calculations (digit-by-digit shown)
A. Coverage = 2,600 sq ft (manufacturer's largest claim)
1. Volume = 2,600 × 8 = 20,800 cu ft.
2. CADR @ 1 ACH = 20,800 ÷ 60 = 20,800 ÷ 60 = 346.666... cfm → 347 cfm (rounded).
3. Adjusted effective CADR ranges:
Conservative (60%): 0.60 × 347 = 208.2 → 208 cfm.
Typical (75%): 0.75 × 347 = 260.25 → 260 cfm.
Optimistic (90%): 0.90 × 347 = 312.3 → 312 cfm.
B. Coverage = 1,420 sq ft
1. Volume = 1,420 × 8 = 11,360 cu ft.
2. CADR @ 1 ACH = 11,360 ÷ 60 = 11,360 ÷ 60 = 189.333... cfm → 189 cfm.
3. Adjusted effective CADR ranges:
60%: 0.60 × 189 = 113.4 → 113 cfm.
75%: 0.75 × 189 = 141.75 → 142 cfm.
90%: 0.90 × 189 = 170.1 → 170 cfm.
C. Coverage = 538 sq ft
1. Volume = 538 × 8 = 4,304 cu ft.
2. CADR @ 1 ACH = 4,304 ÷ 60 = 4,304 ÷ 60 = 71.7333... cfm → 72 cfm.
3. Adjusted effective CADR ranges:
60%: 0.60 × 72 = 43.2 → 43 cfm.
75%: 0.75 × 72 = 54 → 54 cfm.
90%: 0.90 × 72 = 64.8 → 65 cfm.
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Summary (plausible CADR values for HAP-607 based on each coverage claim)
If the HAP-607 truly targets 2,600 sq ft at 1 ACH, plausible effective CADR ≈ 208–312 cfm (typical ≈ 260 cfm).
If it targets 1,420 sq ft, plausible effective CADR ≈ 113–170 cfm (typical ≈ 142 cfm).
If it targets 538 sq ft, plausible effective CADR ≈ 43–65 cfm (typical ≈ 54 cfm).
> Practically speaking, the ~260 cfm number (the "typical" result for the 2,600-sq-ft claim) matches the order of magnitude of many consumer purifiers that claim large coverage — but again, it's an estimate based on marketing claims, not a verified AHAM value.
What the numbers mean for room sizing / performance
For a 200 sq ft bedroom (200 × 8 = 1,600 cu ft):
To reach 4 ACH (recommended for strong removal): required CADR = (1,600 × 4) ÷ 60 = 6,400 ÷ 60 = 106.67 → 107 cfm.
So the HAP-607, under the 1,420-sq-ft typical estimate (142 cfm), would be fine; under the 538 claim typical (54 cfm) would be insufficient for 4 ACH.
For a 500 sq ft living area: required CADR for 4 ACH = ((500×8)×4) ÷ 60 = (4,000×4) ÷ 60 = 16,000 ÷ 60 = 266.67 → 267 cfm.
That means only the optimistic/typical results for the 2,600-sq-ft claim (≥260 cfm) would be adequate; the 1,420 claim results would fall short.
Caveats / uncertainty sources
Manufacturer "coverage" claims are inconsistent and often optimistic. Interpreting them as 1 ACH may be wrong in some listings.
Real CADR depends on filter type, actual fan curve, and whether the device meets AHAM testing conditions. That's why I used the 60–90% adjustment band.
Noise and sustained performance: some purifiers hit a high CFM briefly but are noisy or throttle back when filters load.
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