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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Activated Carbon Filter Pad - Cut to Fit Air Vent Filters for Home, AC, Furnace, Range Hood & Vent - Charcoal Filter Sheets Material for Dust, Odor, Smoke & Allergen Removal - 1 Pack

Product ID: 46216302

Details

Air Filter Construction
Pad/Roll
Brand
FRESH
Compatible Devices
Air Box Fan
Filter Shape
Custom Shaped
Manufacturer
Fresh
Material
Activated

♻️Reusable & washable material

🌬️Optimized airflow retention

🛠️Custom cut-to-fit design

S$33

Duties & taxes included

In stock

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Description

🌿 Cut, Fit, Breathe: Your Home’s Secret to Cleaner, Fresher Air

ECO FRIENDLY COST SAVING - Durable, washable filter pad extends lifespan and reduces waste—smart for your wallet and the planet.
TAILORED FIT FOR EVERY VENT - Easily trim to size for any HVAC, AC, or range hood—perfectly customized clean air.
VERSATILE HOME AIR SOLUTION - Fits multiple devices including furnaces, box fans, and portable ACs for whole-home freshness.
POWERFUL ODOR ALLERGEN TRAP - Activated carbon neutralizes smoke, dust, pollen, and pet dander fast for fresher living spaces.
BREATHE FREELY WITHOUT COMPROMISE - Advanced filter media enhances air quality while maintaining optimal airflow—no system strain.

This activated carbon filter pad from Fresh Headquarters offers a customizable, cut-to-fit solution for HVAC, AC, furnace, and range hood vents. Designed to trap dust, odors, smoke, and allergens effectively, it maintains airflow while improving indoor air quality. The washable, reusable material extends filter life and reduces system strain, making it an eco-friendly and versatile choice for healthier home environments.

Specifications

ASIN	B074MKZNFW
Air Filter Construction	Pad/Roll
Best Sellers Rank	#23,932 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #126 in Air Purifier Filters
Brand Name	FRESH HEADQUARTERS
Common Applications	Allergen Reduction, Odor Reduction
Compatible Air Purifier Models	Honeywell 17000, Honeywell HPA100, Honeywell HPA200, Honeywell HPA300
Compatible Devices	Air Conditioner, Box Fan, Furnace, Range Hood
Customer Reviews	4.5 4.5 out of 5 stars (3,006)
Filter Shape	Custom Shaped
Item Dimensions L x W x Thickness	48"L x 16"W x 0.18"Th
Manufacturer	Fresh Headquarters
Manufacturer Part Number	14207192
Material Type	Activated Carbon
Model Number	14207192
Number of Items	1
Number of Packs	1
Product Grade	new
UPC	761315314045
Unit Count	1 Count

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