Doesn’t the pre-filter reduce air flow through the filter?

It depends on the conditions. They are washable, so i change mine out and wash then every 45 days.

Do these fit 211 auto?

They are for a stand alone air purifier for your home.

Do these fit on the Blue Air 411 unit they look the same size?

I would think so. They're really stretchy...maybe keep reading the full product description; it may tell you.

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🌬️ Elevate your air game with style and ease!

EFFORTLESS REFRESH - Simply swap or toss in the washing machine to keep air fresh and clean
COMPACT PERFECT FIT - Precisely designed 7.5 x 6.2 x 0.5 inches for seamless Blueair Blue Pure 211+ compatibility
VIBRANT STYLE UPGRADE - Choose from Lunar Rock, Diva Blue, Lavender Purple, or Forest Green to match your vibe
SMART INVESTMENT IN CLEAN AIR - Affordable, durable replacements that keep your environment healthier and your purifier efficient
PROLONG YOUR PURIFIERS POWER - Pre-filters trap pollen, dust & pet dander, boosting main filter longevity

The Cabiclean 4 Pack 211+ Replacement Washable Pre-Filters are designed exclusively for Blueair Blue Pure 211+ air purifiers. These washable pre-filters capture larger particles like pollen, dust, and pet dander, extending the life of your main filter. Available in four stylish colors, they are easy to install, maintain, and replace every 2-3 months, ensuring optimal air purification performance and a personalized touch to your living space.

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Brand Name	Cabiclean
Model Info	211+
Item Weight	5.6 ounces
Product Dimensions	7.5 x 6.2 x 0.5 inches
Item model number	211+
Part Number	Buleprefilter-4
Color	Color Set 1
Compatible Device	Blueair Blue Pure 211+ air Purifier
Batteries Included?	No
Batteries Required?	No

4 Pack 211+ Replacement Washable Pre-Filters for Blueair Blue Pure 211+ air purifier, Removes Pollen, Dust, Pet Dander, Color include Lunar Rock, Diva Blue, Lavender Purple, Forest green

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