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 (16Ft²), Air Particles, Clean Living Basic Dust Small as 0.3 Microns, Efficiency Breathable DIY Design (16 Square Feet)

Merv 13 Filter Material for Air Filters (16Ft²), Air Particles, Clean Living Basic Dust Small as 0.3 Microns, Efficiency Breathable DIY Design (16 Square Feet)

Product ID: 316022102

Details

Air Filter Construction
Pad/Roll
Brand
PRETTYWIT
Compatible Devices
Furnace
Filter Shape
Rectangular
MERV Rating
13
Manufacturer
AIRBAY

📏Generous 16 ft² DIY cut-to-fit size

🦠Filters particles down to 0.3 microns

🛡️Fiberglass-free, safe & breathable

Description

🌬️ Elevate your air game—breathe smarter, live better!

SUPERIOR PARTICLE DEFENSE - MERV 13 rating captures ultra-fine airborne particles for cleaner, healthier air.
SAFE BREATHABLE MATERIAL - No fiberglass means irritation-free handling and worry-free indoor air quality.
CUSTOMIZABLE FIT FOR EVERY SPACE - Large 16 square feet sheet easily cut to your exact HVAC or furnace filter dimensions.
VERSATILE USE ACROSS ENVIRONMENTS - Perfect for homes, offices, warehouses—protect your space with trusted filtration.
HASSLE FREE SATISFACTION GUARANTEE - Backed by responsive customer service to ensure your air stays fresh and clean.

This MERV 13 filter material offers a high-efficiency solution to trap airborne particles as small as 0.3 microns. With a large 16 square feet size, it’s designed for easy DIY customization to fit various HVAC and furnace filters. Made without fiberglass, it ensures safe, breathable air filtration suitable for homes, offices, and commercial spaces. Trusted by thousands with a 4.4-star rating and backed by dedicated customer support.

Specifications

ASIN	B08K3BDHR6
Air Filter Construction	Pad/Roll
Best Sellers Rank	#198,258 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,098 in Furnace Filters
Brand Name	PRETTYWIT
Common Applications	Appliances, Residential
Compatible Devices	Furnace
Customer Reviews	4.3 4.3 out of 5 stars (310)
Filter Shape	Rectangular
Item Dimensions L x W x Thickness	84.65"L x 27.56"W x 1"Th
MERV Rating	13
Manufacturer	AIRBAY
Manufacturer Part Number	65
Material Type	Merv 13 Material
Model Number	65
Number of Items	1
Number of Packs	1
UPC	193499920871
Unit Count	1 Count

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