Why is this filter producing a smell with over 160+ days left?

If you are using a DualProtection (previously "SmokeStop") filter, the filter will always have a smell of burnt charcoal as long as the charcoal remains effective. While strong at first, it should soon taper off to the point where you only smell it if your nose is right at the air outlet of the unit. If you don't smell it there, then the filter no longer is effective at removing odors/VOCs.

Why does this filter come in two parts (carbon can be pulled away using the cloth tab)?

As mentioned, original Blueair filters do not have a separate carbon layer which can be pulled off. The good news is, a separate, removable carbon layer means you can replace it when the carbon is no longer effective (which is typically much sooner than the particle filter needs replacing, so it can save you money). The bad news is, you are not using the intended Blueair filter, which means you are probably not getting the same level of filtration with the same airflow as you would be otherwise.

how much carbon is in the combination filter? Blueair chat told me about 7 lbs, but that is much more than the weight of the product so am skeptical

There is no carbon in this filter or the ones I buy, I have in the past bought the smoke eater filter. That filter has carbon, found that the cost is not worth it

On the dp filter i received, on the black metal side, it says to face the fan - is that the intake side? so left: white, right: black when cover open?

Years ago I was told directly by the Blueair techs in Sweden, that the black carbon side of the filter needed to face outwards, so the metal grid on the particle side of the filter faces away from the ionizer at the air inlet. Otherwise the metal grid would dissipate the charge on the particles and reduce the efficiency of the filter. If it is indeed the case now that it doesn't matter, then definitely place the filter with the carbon side facing inwards, as the carbon element clogs up with dust much quicker than the pleated element of the filter.

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🌬️ Elevate your air game with Blueair’s DualProtection – because your lungs deserve the best!

SMART MAINTENANCE - Recommended filter replacement every 6 months keeps your air purifier performing at peak efficiency ♻️
BREATHE CONFIDENTLY - Captures pollen, dust, pet dander, mold spores, viruses, and bacteria for healthier indoor air 🌿
DUAL PROTECTION POWER - Activated coconut carbon layer neutralizes odors & VOCs while particle filter traps allergens 🛡️
SEAMLESS COMPATIBILITY - Genuine Blueair filter fits Classic 400 Series models for effortless upgrades 🔄
TURBOCHARGED CLEAN AIR - Removes pollutants up to 4x faster than standard carbon filters ⚡

The BLUEAIR Classic 400 Series Genuine DualProtection Filter combines an activated coconut carbon layer with a high-efficiency particle filter to remove odors, VOCs, and airborne pollutants up to 4 times faster than standard carbon filters. Compatible with multiple Blueair Classic 400 models, this 6-month lifespan filter ensures superior indoor air quality by capturing allergens, smoke, bacteria, and viruses, making it an essential upgrade for health-conscious professionals.

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Manufacturer	Blueair
Part Number	402DPF
Product Dimensions	52.07 x 24.89 x 9.4 cm; 380 g
Item model number	402 DPF
Size	52.1 x 24.9 x 9.4 cm
Colour	White
Style	400 Series: Dual Protection Filter
Material	Carbon Fibre Activated Carbon Carbon fibre
Item Package Quantity	1
Included Components	Installation hardware
Batteries included?	No
Batteries Required?	No
Item Weight	380 g

Blueair Classic 400 Series Genuine DualProtection Filter; Classic 402, 403, 410, 450E, 455EB, 405, 480i

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