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)

Product ID: 316022102

Details

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

📏Generous 16 sq ft DIY-friendly size

🦠Filters particles down to 0.3 microns

🛡️Fiberglass-free, safe & breathable

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COP 149812

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌬️ Breathe smarter, live better—filter like a pro!

SAFE BREATHABLE DESIGN - No fiberglass means irritation-free handling and worry-free indoor air quality.
SPACIOUS 16 SQ FT COVERAGE - Ample material to customize filters for any HVAC or furnace setup—cut to fit your exact needs.
SATISFACTION BACKED QUALITY - Confidently backed by responsive customer service to ensure your air stays fresh and safe.
ULTRA FINE PARTICLE DEFENSE - Captures airborne particles as tiny as 0.3 microns for cleaner, healthier air.
VERSATILE DIY COMPATIBILITY - Perfect for home, office, or warehouse air protection—empower your space with premium filtration.

The Merv 13 Filter Material offers a high-efficiency filtration solution capturing particles as small as 0.3 microns. With a large 16 square feet size, it’s perfect for DIY customization in HVAC and furnace filters. Made without fiberglass, it ensures safe, breathable air quality for homes and workplaces, backed by reliable customer support.

Specifications

ASIN	B08K3BDHR6
Air Filter Construction	Pad/Roll
Best Sellers Rank	#46,948 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #362 in Furnace Filters
Brand Name	PRETTYWIT
Common Applications	Appliances, Residential
Compatible Devices	Furnace
Customer Reviews	4.4 4.4 out of 5 stars (301)
MERV Rating	13
Manufacturer	AIRBAY
Manufacturer Part Number	65
Material Type	Merv 13 Material
Model Number	65
Number of Items	1
Product Grade	new
UPC	193499920871
Unit Count	1.0 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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Excellent communication throughout the order process. Product is perfect.

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COP 149812

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered 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 Colombia.

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