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 Air Filter (32 Ft²) - Prevents Particulates, Allergens, Dust, Mildew, Pet Dander - Efficient Breathability, DIY Design (16 sq ft)

Merv 13 Filter Material Air Filter (32 Ft²) - Prevents Particulates, Allergens, Dust, Mildew, Pet Dander - Efficient Breathability, DIY Design (16 sq ft)

Product ID: 725761472

Details

Brand
PrettyWit
MERV Rating
13
Compatible Devices
Furnace
Item Weight
0.13 Kilograms
Compatible Air Conditioners
Inventor
UPC
193499920871

✂️32 ft² DIY cut-to-fit design

🌬️Efficient breathability without fiberglass

🛡️MERV 13 captures 90% of 1-3µm particles

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€ 7947.18

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Breathe Boldly: Filter Smarter, Live Healthier!

VERSATILE RELIABLE - Ideal for homes, offices, warehouses, and medical facilities seeking premium air protection.
FIBERGLASS FREE COMFORT - Safe, hypoallergenic material ensures breathable air without irritating fibers or chemicals.
SUPERIOR PARTICLE DEFENSE - Blocks 90% of allergens, dust, and pet dander down to 0.3 microns for cleaner, healthier air.
EFFORTLESS DIY INSTALLATION - Lightweight, flexible design makes cutting and fitting a breeze—upgrade your air quality in minutes.
CUSTOMIZABLE FIT FOR ANY SPACE - Generous 32 sq ft sheet lets you tailor your filter size perfectly to your HVAC or furnace needs.

The PrettyWit MERV 13 Filter Material offers a commercial-grade air filtration solution that captures up to 90% of airborne particles as small as 0.3 microns. With a large 32 sq ft fiberglass-free sheet, it’s designed for easy DIY customization to fit various HVAC and furnace systems, providing efficient breathability and superior protection against allergens, dust, mold, and pet dander in any environment.

Specifications

ASIN	B08K3BDHR6
Brand	PrettyWit
Brand Name	PrettyWit
Compatible Air Conditioners	Inventor Chilly 9000BTU
Compatible Devices	Furnace
Customer Reviews	4.3 out of 5 stars 272 Your Review
Item Dimensions L x W x Thickness	2.15L x 0.7W x 0.03Th m
MERV Rating	13
Manufacturer	AIRBAY
Material	Merv 13素材。
Material Type	Merv 13素材。
Model Number	65
Number of Items	1
Product Dimensions	2.15L x 0.7W x 0.03Th m
Product Grade	Brand New
UPC	193499920871
Unit Count	1.0 Count

Reviews

E**N

clean air

27.12.2025

A**R

Works well.

1.01.2026

P**.

Great to create replacement filters

10.07.2025

G**N

Great Product

22.07.2025

T**N

32 ft2 or 16 ft2

13.12.2022

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