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: 544283575

Details

Brand
PrettyWit
Compatible Devices
Furnace
MERV Rating
13
Material
Fibreglass
UPC
193499920871

📏Large 32 ft² coverage

🌬️Filters particles down to 0.3 microns

🛡️MERV 13 rated filtration

Description

🌟 Breathe Brilliance: Upgrade to MERV 13 and own the clean air advantage!

ELITE AIR DEFENSE - Blocks 90% of harmful particles as small as 0.3 microns for cleaner, safer breathing.
GENEROUS COVERAGE - A massive 32 square feet of filter material—custom cut to fit your unique HVAC or DIY needs.
EFFORTLESS DIY UPGRADE - Easily cut and install to instantly elevate your home or office air quality with professional-grade filtration.
FIBERGLASS FREE SAFETY - Crafted without fiberglass for a safer, eco-conscious air filter solution you can trust.
HYPOALLERGENIC BREATHABLE - Soft, non-irritating design ensures maximum airflow without compromising protection.

This MERV 13 filter material offers professional-grade air purification by capturing 90% of particles in the 0.3 to 10 micron range, including allergens, dust, mold, and pet dander. With a large 32 ft² size, it’s perfect for custom HVAC or DIY air filter projects. Hypoallergenic, breathable, and fiberglass-free, it ensures safe, efficient filtration for homes and workplaces alike.

Specifications

ASIN	B08K3BDHR6
Brand	PrettyWit
Brand Name	PrettyWit
Compatible Devices	Furnace
Customer Reviews	4.3 out of 5 stars 307 Reviews
MERV Rating	13
Manufacturer	AIRBAY
Manufacturer Part Number	65
Material	Fibreglass
Material Type	Fibreglass
Model Number	65
UPC	193499920871
Unit Count	1.0 Count

Reviews

J**S

Perfect for anything with a fan

Perfect for anything with a fan. Just cut to fit the intake side of the fan and the air exiting the fan will be cleaner. I have used it on a box fane and it collects an amazing amount of dust. I have also been using it on two window air conditioners to filter the air. I don't know why I didn't think of this years ago but it is absolutely fantastic and I will continue to do this for the rest of my life. Try it and you will be amazed.

15.08.2023

P**.

Great to create replacement filters

I used this to revive an old Rigid air filter system. OEM filters are no longer available so this is a practical alternative.

10.07.2025

E**N

clean air

they worked great

27.12.2025

A**R

Works well.

Works well to reduce airborne particulates by filtration. I have noticed a decrease in respiratory issues after use.

1.01.2026

S**.

Mobile home

I live in a mobile home and the furnace only uses a certain kind of because of the size of furnace…..they suck(pun intended) they are terrible….this one is fantastic cut to size ….allergen certified…dander….smoke…hair….this one gets it all……best I’ve used…I recommend

4.10.2024

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