Can I use this filter for mask(face mask) liner?

Because of the micron size of viruses, only very specific masks have any chance of filtering them out-and even those ones HAVE to be professionally fitted to have any efficacy (like the N95-which even when professionally fitted and used properly only stops 95% of virus micron size) and MUST be worn under very strict guidelines otherwise it offers no more virus protection than the cloth and surgical masks- which do not do not stop virus micron size from getting thru at all. To actually stop virus micron size you will either have to invest in a professionally fitted N95 and strictly follow the wearing protocol or to purchase a professionally rated respirator that guarantees to filter micron size of 0.01 or under (such as what virologists use in labs). Do not forget that viruses enter thru mucous membranes and so eye protection (such as goggles) will also be a MUST if you want to be truly protected from anything with a virus micron size. Hope this helps!

It says it's 1/4 inch thick in the picture and 1/16 in thick in the description, which is it?

1/16th, but can be doubled, tripled, or quadrupled, etc., in thickness.

Can this be put inside the air opening of a window AC unit to block out the light that comes through the vent?

I would rate its opacity to approx. 70%-80% (when clean and new). Remember, this is designed to trap small dust particles. As it does its job, it will become more opaque as well as not pass air efficiently.

I don't know the answer for his particular filter material, but washing was not recommended for other carbon filter pads I used in the past.

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🌬️ Breathe Boldly: Tailor-Made Carbon Filtration for the Air You Deserve

EFFORTLESS UPGRADE - No tools or tech skills needed—install in minutes and instantly boost your indoor air quality.
MULTI USE VERSATILITY - Compatible with Whirlpool, KitchenAid, 3D printers & standard filtration systems—one filter to rule them all.
CUSTOM FIT ZERO WASTE - Cut your own perfect filter sizes from one large sheet—fits air purifiers, ACs, range hoods & more.
DEEP CLEAN AIR DEFENSE - 3/16" thick activated carbon traps dust, pet hair, smoke, odors & VOCs for fresher breathing.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly made in the USA with rigorous quality control for reliable, long-lasting filtration.

The Fresh Headquarters Cut-to-Fit Carbon Pad is a premium 3/16" thick activated carbon filter sheet measuring 16" x 48", designed for universal compatibility with air purifiers, HVAC systems, range hoods, and more. Made in the USA, this versatile filter can be custom cut to size, providing superior removal of dust, pet hair, smoke, odors, and VOCs. Easy to install without tools, it offers professional-grade air purification that enhances indoor air quality and supports healthier living environments.

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Brand	FRESH HEADQUARTERS
Model	14207192
Product Dimensions	48 x 16 x 0.25 cm; 100 g
Part Number	14207192
Compatible Devices	Air Purifier
Material Type	Carbon
Batteries included?	No
Batteries Required?	No
Item Weight	100 g

Fresh Headquarters Cut‑to‑Fit Carbon Pad Pre‑Filter Roll – Universal Activated Carbon Sheet for Air Purifier, Furnace, AC, Range Hood, 3D Printer & More Odor/VOC Control

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Description

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Fresh Headquarters Cut‑to‑Fit Carbon Pad Pre‑Filter Roll – Universal Activated Carbon Sheet for Air Purifier, Furnace, AC, Range Hood, 3D Printer & More Odor/VOC Control

Details

Description

Specifications

Have a Question? See What Others Asked

Common Questions

Fresh Headquarters Cut‑to‑Fit Carbon Pad Pre‑Filter Roll – Universal Activated Carbon Sheet for Air Purifier, Furnace, AC, Range Hood, 3D Printer & More Odor/VOC Control