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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AIRBAY 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: 326258368

Details

Brand
PrettyWit
Compatible devices
Furnace
MERV rating
13
Material
Merv 13
Product dimensions
2.15L x 0.7W x

📏Generous 16 sq ft DIY cut-to-fit size

🦠Filters particles down to 0.3 microns

🛡️MERV 13 rated for superior air protection

R1329

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌬️ Breathe smarter, live better—filter like a pro with AIRBAY MERV 13!

CONFIDENCE BACKED QUALITY - Packed hygienically with a satisfaction guarantee—because your air deserves the best.
ULTRA FINE PARTICLE DEFENSE - Blocks airborne irritants as tiny as 0.3 microns for cleaner, healthier air.
FIBERGLASS FREE BREATHABLE - Safe, soft fabric material ensures easy handling and optimal airflow without fiberglass risks.
CUSTOMIZABLE FIT FOR EVERY SPACE - Massive 16 sq ft roll lets you tailor your filter perfectly—no more compromises.
VERSATILE USE ACROSS ENVIRONMENTS - Ideal for homes, offices, warehouses—protect your space and everyone in it.

The AIRBAY MERV 13 Filter Material offers a high-efficiency filtration solution capable of capturing particles as small as 0.3 microns. With a large 16 square feet size, it’s perfect for DIY air filter projects, allowing custom cuts to fit various furnace and HVAC systems. Made from soft, fiberglass-free fabric, it ensures safe, breathable air filtration suitable for residential and commercial environments. Backed by a customer satisfaction guarantee, this filter material helps reduce airborne contaminants and improve indoor air quality.

Specifications

ASIN	B08K3BDHR6
Air Filter Construction	Pad/Roll
Best Sellers Rank	#79,442 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #39 in Furnace Filters
Brand Name	PrettyWit
Common Applications	Appliances, Residential
Compatible Devices	Furnace
Compatible Hvac Systems	residential
Customer Reviews	4.3 4.3 out of 5 stars (307)
Filter Mounting Type	Slide In
Filter Shape	Rectangular
Item Dimensions L x W x Thickness	2.15L x 0.7W x 0.03Th Meters
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
Product Grade	new
UPC	193499920871
Unit Count	1.0 Count

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