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

SAFE BREATHABLE DESIGN - No fiberglass means no irritation—just pure, breathable protection for your home or office.
TRUSTED QUALITY SUPPORT - Backed by a satisfaction guarantee and responsive customer service to keep your air fresh and worry-free.
SPACIOUS 16 SQ FT COVERAGE - Ample material to customize your HVAC or furnace filters with precision and ease.
ULTRA FINE PARTICLE DEFENSE - Captures airborne particles as tiny as 0.3 microns for cleaner, healthier air.
EFFORTLESS DIY CUSTOMIZATION - Cut and fit the filter material exactly to your needs, perfect for professional-grade air quality upgrades.

The PRETTYWIT Merv 13 Filter Material offers 16 square feet of high-efficiency filtration, capturing particles as small as 0.3 microns without fiberglass irritation. Designed for easy DIY customization, it’s ideal for upgrading furnace and HVAC filters in homes and workplaces, ensuring safer, cleaner air with trusted quality and customer support.

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Brand Name	PRETTYWIT
Model Info	65
Item Weight	4.6 ounces
Package Dimensions	12.91 x 9.13 x 2.95 inches
Item model number	65
Part Number	65
Color	16 Square Feet
Compatible Device	Furnace
Batteries Included?	No
Batteries Required?	No

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)

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