Air purifier Black Friday and Prime Day deal check: match the smoke CADR to the room before you trust the discount

Do not buy an air purifier because the deal badge is bright; buy it because its smoke CADR covers your room’s square feet. If it does not, the discount is on the wrong unit.

The price and any “Save” figure on each card above are Amazon’s live numbers with Amazon’s time stamp; this page states no price of its own.

Is the discount real?

The percentage depends on the denominator. Amazon’s seller guidance defines the struck-through List Price as the suggested retail price from a manufacturer, supplier or seller, validated against sales in its store and external competitor prices, and a Typical Price as the median customers paid in Amazon’s store over the past 90 days, excluding limited-time promotions.

A saving against a List Price nobody paid is a different claim from a saving against the 90-day median. The FTC’s Guides Against Deceptive Pricing, 16 CFR 233.1, accept a former-price comparison only when the former price is the actual, bona fide price offered to the public on a regular basis for a reasonably substantial period.

Amazon’s announcement puts Prime Big Deal Days at October 6-7, 2026, from 12:01 a.m. PDT on October 6, for Prime members. Black Friday is Friday November 27, 2026 and Cyber Monday November 30, by the calendar: as of 2 October, Amazon had not published a Black Friday window on any page this site could open.

Which smoke CADR fits your room?

CADR, the Clean Air Delivery Rate, is the volume of filtered air a unit delivers per minute, measured separately for tobacco smoke, dust and pollen. AHAM’s rule is a smoke CADR at least two-thirds of the room’s floor area in square feet; for wildfire smoke, a smoke CADR equal to the room area.

EPA’s Guide to Air Cleaners in the Home prints a chart in the same range: 100 sq ft needs a minimum CADR of 65 cfm, 600 sq ft needs 390 cfm. The CADR calculator runs the rule; by it the Coway Airmega 400’s smoke CADR of 328 covers about 490 sq ft and the Winix 5510’s 253 about 380.

Why is the room size on the box the wrong number?

The large number on a listing is the area the unit turns over once an hour; the AHAM figure is the area at 4.8 air changes an hour. The maker pages print both.

The Winix 5510 is the clean example: 1,882 divided by 392 is 4.8, the air-change basis Winix prints (OwnerSpec’s arithmetic). Its Amazon title reads “Up to 1881 Ft² in 1 Hr”; a 1,881 sq ft room needs a smoke CADR around 1,250 by AHAM’s rule.

The second trap is a CADR with nobody behind it. AHAM’s Verifide directory lists certified models by CADR, suggested room size, manufacturer and brand; the AHAM seal prints all three CADR figures. Only the Winix page above prints an AHAM verified figure; Levoit gives one CADR without naming the pollutant. A number not in the directory is the maker’s own test.

Does it make ozone?

EPA’s air cleaner guide says no federal agency has approved ozone generators for use in occupied spaces and advises against air cleaners that intentionally produce ozone; electrostatic precipitators, ionizers, UV lights without adequate lamp coatings and plasma air cleaners may have the potential to emit it. EPA points to the CARB and AHAM lists and certifies no brand.

The California Air Resources Board sets the ozone emission limit for electronic air cleaners at 0.050 ppm, has required certification for portable indoor air cleaners sold in California since 2010, and publishes the wording to look for: Meets California ozone emissions limit, CARB certified. On the pages read, Winix lists CARB for the 5510, Levoit calls the Core 300-P CARB compliant and ozone free and the Vital 200S-P, Coway Mighty and Airmega 400 pages do not mention CARB. An ionizer or plasma mode that cannot be switched off is a reason to pick another unit.

What will the filters cost after the sale?

The purchase price is one line; filters are every year after. Fill in from the maker’s page:

• Filters per year = 12 / maker interval in months
• Yearly filter cost = filter price x filters per year
• Add a second line for any unit with two filters on different intervals

A unit with no genuine filter for sale, or no published interval, cannot be costed; the replacement filter by model page lists part numbers and intervals.

Buy it on sale or skip it?

What should you do first?

1. Measure the room: length x width in feet.
2. Multiply by two-thirds (or by one for wildfire smoke) to get the minimum smoke CADR.
3. Read the smoke CADR and the 4.8-air-change room size on the maker’s page, not the box figure.
4. Look for the CARB certified wording and check whether any ionizer mode switches off.
5. Open the filter page: interval in months, and whether a genuine filter is sold.
6. Compare the card’s saving against the Typical Price, not only the List Price.

OwnerSpec’s bedroom and living room air purifier review compares these units on the same specs.

Frequently asked questions

Sources

1. Amazon, Prime Big Deal Days 2026 announcement (retailer listing or retailer-hosted document)
2. Amazon Sell, Engage customers with an Amazon List Price (retailer listing or retailer-hosted document)
3. Cornell LII, 16 CFR 233.1 Former price comparisons (university or extension service)
4. AHAM, Tips for choosing the ideal portable room air cleaner (manufacturer or vendor document)
5. AHAM Verifide, Directory of certified room air cleaners (manufacturer or vendor document)
6. EPA, Guide to Air Cleaners in the Home (government or regulatory source)
7. California Air Resources Board, Air Cleaner Information for Consumers (government or regulatory source)
8. Winix America, 5510 Air Purifier product page (manufacturer or vendor document)
9. Coway, Airmega Mighty AP-1512HH product page (manufacturer or vendor document)
10. Coway, Airmega 400 product page (manufacturer or vendor document)
11. Levoit, Core 300-P air purifier product page (manufacturer or vendor document)
12. Levoit, Core 300 Series original replacement filter page (manufacturer or vendor document)
13. Levoit, Vital 200S-P smart air purifier product page (manufacturer or vendor document)