This listing states material: fiberglas, but in description, states no fiberglas.which is correct?

I have the same question... Its very disheartening that, after 3 months, absolutely no one can tell you what this material actually is

can i use this on mattress to protect from dust mites?

I don't think that would work, I would get a plastic cover for the mattress.

We have older round ceiling vents. Going to cut to size but are these supposed to go on outside of vent or the inside? Does it matter?

Typically you want your filters to be in line right before your furnace/blower. That way all the junk being sucked in through the return duct in your house doesn't collect inside your furnace or duct system, I'll usually use filters over the vents as a secondary if I think a location really needs it or the customer requests it. That all being said, either inside or outside the vent works the same as long as you can ensure there are no holes where air (and therefore microscopic particulates) can infiltrate.

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Merv 13 Filter Material for Air Filters (32 Ft²) , Stops Air Particles, Allergens, Dust, Mold and Pet Dander as Small as 0.3 Microns, Efficiency Breathable DIY Design (16 Square Feet)

Product ID: 485945103

Details

Air Filter Construction
Pad/Roll
Brand
PRETTYWIT
Compatible Air Conditioners
Inventor
Compatible devices
Furnace
Filter Shape
Rectangular
MERV rating
13

📏Large 16 sq ft DIY customizable size

🦠Filters particles down to 0.3 microns

🌬️Breathable, lightweight, no fiberglass

€ 80.02

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌟 Elevate your air game—because your lungs deserve the best!

MICROSCOPIC DEFENSE - Captures 90% of harmful particles as small as 0.3 microns for cleaner, safer air.
BREATHE EASY LIVE BETTER - Soft, breathable material ensures high airflow without compromising protection.
TRUSTED QUALITY SUPPORT - Backed by reliable customer service and satisfaction guarantee for peace of mind.
CUSTOM FIT ULTIMATE CONTROL - Generous 16 sq ft roll lets you tailor your filter perfectly to any HVAC or furnace system.
HYPOALLERGENIC FIBERGLASS FREE - Safe for sensitive environments—no fiberglass irritation, just pure clean air.

The PRETTYWIT MERV 13 Filter Material offers a high-efficiency filtration solution that traps airborne particles as small as 0.3 microns, including dust, allergens, mold, and pet dander. Designed as a large 16 sq ft roll, it’s perfect for DIY customization to fit various HVAC and furnace filters. Made from breathable, hypoallergenic, and fiberglass-free material, it ensures safe, comfortable airflow while significantly improving indoor air quality. Ideal for homes, offices, and warehouses, this filter material combines professional-grade performance with user-friendly design and dependable customer support.

Specifications

ASIN	B08K3BDHR6
Air Filter Construction	Pad/Roll
Best Sellers Rank	4,111,708 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 3,438 in Air Purifier Filters
Brand Name	PRETTYWIT
Common Applications	Appliances, Residential
Compatible Air Conditioners	Inventor Chilly 9000BTU
Compatible Devices	Furnace
Compatible Hvac Systems	residential
Country Of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (307)
Filter Shape	Rectangular
Item Dimensions L x W x Thickness	2.15L x 0.7W x 0.03Th metres
MERV Rating	13
Manufacturer	AIRBAY
Manufacturer Part Number	65
Material Type	Fibreglass
Model Number	65
Number of Items	1
Number of Packs	1
Product Grade	new
UPC	193499920871
Unit Count	1.0 count

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€ 80.02

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Italy.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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