Air Quality research
What is CADR
What is CADR explained with source boundaries, specification context, and BenchPicked methodology notes.
Written by BenchPicked Editorial Team · Sources checked May 16, 2026
Executive Summary
Bottom line
Clean Air Delivery Rate (CADR) defines AHAM AC-1 room air cleaner certification by quantifying cubic feet per minute (CFM) of particle-free air across smoke (0.09–1.0 µm), dust (0.5–3.0 µm), and pollen (5.0–11.0 µm). Use verified Clean Air Delivery Rate (CADR) calculations, hardware tradeoff rules, and 3-year consumable math to compare models such as A higher-CADR purifier, A quieter compact purifier, and Source control or ventilation.
- Best Suited For
- people choosing a room air cleaner for a defined room and operating routine
- Core Buying Check
- use what is cadr to make a product decision without overreading promotional claims
- Key Evaluation Context
- matching cleaned-air delivery, noise, filter upkeep and room conditions
Decision matrix
Compare each documented specification against your room, routine, or operating requirements before checking live prices.
| Evaluation Factor | Documented Spec / Status | Buyer Takeaway |
|---|---|---|
| Primary engineering metric | cubic feet per minute (CFM) of particle-free air across smoke (0.09–1.0 µm), dust (0.5–3.0 µm), and pollen (5.0–11.0 µm) | Use cubic feet per minute (CFM) of particle-free air across smoke (0.09–1.0 µm), dust (0.5–3.0 µm), and pollen (5.0–11.0 µm) as your primary filter when sizing options in AHAM AC-1 room air cleaner certification. |
| Sizing & calculation rule | Under the standard AHAM 2/3 rule assuming an 8-foot ceiling, multiply the smoke CADR figure by 1. | Apply this formula to raw spec-sheet numbers rather than headline marketing banners. |
| 3-year ownership check | Hardware + consumables + power/subscriptions | Cross-check recurring filters, batteries, or membership fees across a higher-CADR purifier and competitors. |
Claim and evidence record
All 1 structured specification claims on this page are cross-referenced against the primary records listed below. Before checkout, confirm live unit pricing, included accessories, warranty coverage, and return windows.
When another option is the better fit
Winix 5510 or Honeywell HPA300 (Large-Room High-CADR Purifiers)
Choose this when your room square footage exceeds 360 sq ft at 4.8 ACH and requires higher cubic-feet-per-minute smoke and dust CADR airflow.
Levoit Core 400S / 400S-P (231–260 CFM Mid-Size Bedroom & Living Purifier)
Choose this when you want verified 358 sq ft (4.8 ACH) room coverage paired with a 24 dB sleep mode and 38W power draw.
Levoit Core 300S (141 CFM Compact Bedroom Purifier)
Choose this when low-decibel bedside operation in a smaller ~219 sq ft room matters more than open-concept high-speed airflow.
Product example
Apply these criteria to Levoit Core 300S: CADR, Room Fit, Noise, and Filter Costs
Use this approved product option as a concrete example while applying the criteria on this page. Confirm its published specifications and current seller terms before ordering.
Read the product researchCompare tested models: Levoit Core 400S / 400S-PWinix 5510Honeywell HPA300Coway Airmega AP-1512HH
Research details
How Clean Air Delivery Rate (CADR) Works: Core Physics & Measurement Rules
Evaluating Clean Air Delivery Rate (CADR) begins with AHAM AC-1 room air cleaner certification, where accurate comparisons depend on cubic feet per minute (CFM) of particle-free air across smoke (0.09–1.0 µm), dust (0.5–3.0 µm), and pollen (5.0–11.0 µm). Under the standard AHAM 2/3 rule assuming an 8-foot ceiling, multiply the smoke CADR figure by 1.55 to find the maximum square footage where the unit achieves 4.8 air changes per hour (ACH). For example, a purifier rated at 233 CFM smoke CADR covers roughly 361 square feet at 4.8 ACH, even if promotional boxes advertise 1 ACH coverage above 1,500 square feet.
Performance Bottlenecks & Design Compromises
Higher CADR requires either a larger blower impeller, higher motor RPM, or lower pressure drop across the pleated media. Compact desktop purifiers below 150 CFM struggle to clear open-concept living rooms because room air mixes faster than a small fan can cycle the volume. Conversely, oversized 400+ CFM towers can run on medium or low speed in a 250-square-foot bedroom, delivering high turnover without 52+ dB high-gear wind noise.
Step-by-Step Spec Audit Before You Buy
Always size your shortlist using the lowest of the three published CADR numbers—typically smoke CADR—rather than pollen CADR or unverified marketing square footage. Cross-check the AHAM Verifide directory or manufacturer spec table for separate smoke, dust, and pollen CFM listings before comparing upfront unit prices. If a manufacturer refuses to disclose independent smoke and dust CFM numbers, assume its coverage headline is inflated by 1-ACH math.
Common Buyer Mistakes & Unverified Claims
Shoppers frequently fall for 'up to X sq ft in 60 minutes' claims, which represent 1.0 ACH—too slow to keep up with continuous wildfire smoke infiltration or pet dander shedding. Another common mistake is assuming CADR measures gas or VOC removal; standard AHAM AC-1 CADR strictly quantifies particulate filtration, not activated carbon adsorption capacity.
Applying Clean Air Delivery Rate (CADR) Benchmarks to Your Shortlist
To put Clean Air Delivery Rate (CADR) into practice across options like A higher-CADR purifier, A quieter compact purifier, and Source control or ventilation, log each candidate's published cubic feet per minute (CFM) of particle-free air across smoke (0.09–1.0 µm), dust (0.5–3.0 µm), and pollen (5.0–11.0 µm) alongside its warranty scope and return policy. Ranking hardware by verified AHAM AC-1 room air cleaner certification capacity per dollar—rather than promotional feature count—prevents undersized purchases and unexpected maintenance expenses over a 36-month ownership cycle.
Full source-attributed specification record (0 fields)
Source notes
- EPA Guide To Air Cleaners In The Home · Government · Checked May 16, 2026
- AHAM Verifide Room Air Cleaner Directory · Industry Standard · Checked May 16, 2026
Questions
Which specific numbers matter most when evaluating Clean Air Delivery Rate (CADR)?
When auditing Clean Air Delivery Rate (CADR), prioritize cubic feet per minute (CFM) of particle-free air across smoke (0.09–1.0 µm), dust (0.5–3.0 µm), and pollen (5.0–11.0 µm) measured under standardized AHAM AC-1 room air cleaner certification test conditions. Recording those exact baseline figures for Clean Air Delivery Rate (CADR) lets you size hardware accurately without relying on peak promotional claims.
What design tradeoffs affect real-world Clean Air Delivery Rate (CADR) performance?
Every product in AHAM AC-1 room air cleaner certification balances cubic feet per minute (CFM) of particle-free air across smoke (0.09–1.0 µm), dust (0.5–3.0 µm), and pollen (5.0–11.0 µm) against physical size, acoustic output, and power or consumable draw. Pushing one variable higher in Clean Air Delivery Rate (CADR)—such as compact housing or ultra-quiet sleep operation—inevitably requires a tradeoff in peak throughput or runtime.
How should I verify Clean Air Delivery Rate (CADR) claims before ordering?
To verify Clean Air Delivery Rate (CADR) before checkout, cross-check the manufacturer's engineering spec sheet for cubic feet per minute (CFM) of particle-free air across smoke (0.09–1.0 µm), dust (0.5–3.0 µm), and pollen (5.0–11.0 µm) and confirm replacement part or subscription pricing. If a listing omits verifiable AHAM AC-1 room air cleaner certification disclosures for Clean Air Delivery Rate (CADR), treat that missing parameter as a hard operating limit.
Which models or benchmarks are best for comparing Clean Air Delivery Rate (CADR)?
For a transparent Clean Air Delivery Rate (CADR) comparison in AHAM AC-1 room air cleaner certification, benchmark your shortlist against A higher-CADR purifier, A quieter compact purifier, and Source control or ventilation. Compare each Clean Air Delivery Rate (CADR) candidate across cubic feet per minute (CFM) of particle-free air across smoke (0.09–1.0 µm), dust (0.5–3.0 µm), and pollen (5.0–11.0 µm), 3-year consumable or membership cost, and open-box return coverage before buying.
Before you buy
Recheck fit and current terms
Compare Levoit Core 300S: CADR, Room Fit, Noise, and Filter Costs with the criteria on this page, then confirm the current seller terms.
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