I see no words in the item description that indicate the quantity as plural, is this a 3 pack or a single?

Watch the video. The machine uses 3 filters at the same time, so it's a 3 pack, that provides a single change of all 3 filters in the machine. The recommendation is one of these 3 packs every 6 months for a complete filter change.

Is this the standard filter used in HepaSilent model for Blueair 500/600 Series Air Purifiers?

Yes. BlueAir only produces one set of 3 filters for the 500/600 series. If you go to their website, www.blueair.com you can read about their HEPASilent Technology. The old original blueair filters used to also have an activated charcoal layer as part of the standard filter. They have done away with that extra layer. If you want to filter cigarette smoke they have another smoke filter series called SmokeStop. The original SmokeStop filters had some extra type of ingredients to filter out VOCs etc. The new non SmokeStop filters don't have the activated charcoal layer so it doesn't filter out any VOCs at all. The old ones used to be able to filter out fumes from new carpet out gassing etc, but not the new ones. Older was better. Just another way to make more money now, ha,ha. We have no choice but to purchase what they offer. Anyone at BlueAir listening?

my Blue air 501 machine takes 3 filters. Is this only 1 filter or the 3 that it needs?

It was a little confusing at first, but the full read to RECOMMENDED to change filter once every 6 months, or dependent on usage. This filter can be recycled after it's changed. The 500/600 Series air purifiers use 3 separate filters, this replacement pack contains a set of 3 filters." It says that it contains the pack / the set of three. These are the dual protection filters. I use the regular ones that are around $79.

Hi, can these be used in the Blueair 680i model? Thanks!

Blueair 500/600 series models should all use the same size filter. If you read the description, it said compatible with 680i.

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Description

🌬️ Breathe smarter, live fresher — upgrade your air game now!

ODOR VOC NEUTRALIZER - Naturally eliminates smoke, VOCs, and household odors without chemicals
RAPID AIR PURIFICATION - Removes pollutants up to 4x faster than standard carbon filters
ALLERGEN BLOCK TECHNOLOGY - Effectively traps pollen, dust, pet dander, mold spores, viruses, and bacteria
ULTIMATE DUAL PROTECTION - Combines activated coconut carbon and particle filter for unmatched air purity
SUSTAINABLY SOURCED HIGH POROSITY - Eco-friendly coconut carbon pleated for maximum filter surface area and efficiency

The BLUEAIR Classic 500/600 Series Genuine Dual Protection Replacement Filter features a high-performance activated coconut carbon layer combined with a particle filter, delivering up to 4x faster removal of pollutants including smoke, VOCs, allergens, and bacteria. Designed for select Classic models, this eco-conscious filter maximizes air purification efficiency with a pleated design and sustainably sourced materials.

Specifications

Brand	BLUEAIR
Model	501DPF
Product Dimensions	33.02 x 23.62 x 6.86 cm; 450 g
Part Number	501DPF
Special Features	{"AllergenBlock": ["Extra protection against allergens. Traps and neutralizes dust, pollen and pet dander"]}, {"DualProtection": ["$149.99"]}, {"Everyday filter": ["$149.99"]}, {"Particle & Carbon": ["Our original filter. Removes allergens and traps light household odors from pets, cooking and smoke"]}, {"Particle": ["$99.99"]}, {"SmokeBlock": ["2x more activated carbon than our original filter. Removes up to 99.99% of wildfire smoke"]}, {"language_tag": ["en"]}, {"manufacturer_part_number": []}, {"rating_count": ["26"]}
Colour	White
Wattage	1500 watts
Compatible Devices	Air Purifier
Material Type	Carbon
Batteries included?	No
Batteries Required?	No
Item Weight	450 g

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