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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🌬️ Breathe smarter, live fresher — don’t let stale air hold you back!

OPTIMIZED LONGEVITY - Set of 3 filters ensures continuous peak air purification with recommended biannual replacements.
DUAL PROTECTION POWER - Activated coconut carbon layer neutralizes odors and harmful gases while the particle filter traps pollen, dust, and viruses.
SEAMLESS COMPATIBILITY - Genuine Blueair filter designed to perfectly fit Classic 500/600 Series models for guaranteed performance.
TURBOCHARGED CLEAN AIR - Experience up to 4x faster removal of smoke, VOCs, and allergens than standard carbon filters.
TRUSTED BRAND ASSURANCE - Maintain your Blueair purifier’s elite efficiency with authentic replacement filters engineered by Blueair.

The Blueair Classic 500/600 Series Genuine DualProtection Filter combines an activated coconut carbon layer with a high-efficiency particle filter to remove odors, VOCs, smoke, pollen, dust, and airborne pathogens up to 4 times faster than typical carbon filters. Compatible with multiple Blueair Classic models, this 3-filter pack is designed for optimal air purification performance with a recommended replacement every 6 months.

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Brand	Blueair
Model	501DPF
Part Number	501DPF
Wattage	1500 Watts
Compatible Devices	Air Purifier
Material	Carbon
Batteries Included	No
Batteries Required	No

Blueair Classic 500/600 Series Genuine DualProtection Filter; Classic 501, 503, 505, 510, 550E, 555EB, 580i, 601, 603, 650E, 605

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