is it large, medium or small?

I purchased mine at Menards, not Amazon but I wouldn't even give my 3M™ OV/P100 Household Multi-Purpose Respirator a half a star. These are probably great for little kids, but if you're an adult, plan on wearing it on your nose or on your chin since it isn't big enough to reach both areas comfortably without pinching your nose. Either that or I must have got a bad one. Also when I lit a match and shook it out, I could smell the sulfur dioxide like I wasn't wearing a mask at all.

Would this be a good respirator for keeping out the vapors of drylok? Or ... should I use the 3M Paint Project Respirator, 6000 Series?

WFace.e This For Vapors And Primarily Painting. No Complaints Yet! Just Always Perform The "Self Check" Listed In The Use Manual To Ensure A Good Seal To Your Face.

Would this provide good protection against stain that is being sprayed on a board fence...what about cleaning out a chicken coop?

This respirator is designed specifically for the following applications: certain non-harmful sprays and vapors from pesticides, stains, varnishes, coatings and sealants.

Does anyone know if this will work well for herbicide (like round up, etc.) out door spraying ?

Yes this will work Most product labels require this type of respirator. Cal osha approved

3m P100 Ov Odor Particulate Multi Purpose Reusable Respirator 65021

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Description

🛡️ Breathe Boldly, Work Confidently — The Ultimate Shield for Your Projects

SUSTAINABLE SAFETY - Reusable design means less waste and more value—protect yourself and the planet simultaneously.
ODOR VAPOR DEFENSE - Specialized organic vapor cartridge reduces odors from stains, varnishes, and sealants—stay fresh on the job.
TAILORED COMFORT FIT - Adjustable head straps ensure a secure, personalized fit for all-day wear without fatigue.
ELITE FILTRATION POWER - NIOSH-approved P100 filter blocks 99.97% of harmful particles and organic vapors—breathe confidently.
LIGHTWEIGHT DURABILITY - Engineered with lightweight materials for maximum comfort and long-lasting use across multiple projects.

The 3M P100/OV Multi-Purpose Reusable Respirator 65021 combines NIOSH-approved P100 filtration with an organic vapor cartridge to block 99.97% of solids, aerosols, and certain vapors. Designed for professionals tackling stains, varnishes, and coatings, it features adjustable straps for a custom fit, lightweight construction for comfort, and a reusable design for sustainable, long-term protection.

Specifications

ASIN	B002NMFLU2
ASIN	B0GSHHD648
Age Range Description	Adult
Best Sellers Rank	#568 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Reusable Respirators
Brand Name	3M
Closure Type	Headband
Color	Multi-color
Customer Reviews	4.6 4.6 out of 5 stars (1,262)
Date First Available	March 13, 2026
Department	Unisex
Fabric Type	reusable-respirators
Filter Class	P100
Fit Type	Adjustable
Global Trade Identification Number	00051141902777
Included Components	1 Pack
Item Dimensions D x W x H	4.5"D x 7.7"W x 7.7"H
Item Package Quantity	1
Item Shape	shape
Item Type Name	reusable-respirators
Item Weight	11.2 ounces
Manufacturer	3M
Manufacturer	3M
Material	Plastic
Material Features	Natural,Organic
Number of Items	4
Part Number	65021H1-DC
Product Style	Reusable-respirators
Recommended Uses For Product	The 3M P100/OV Odor/Particulate Multi-Purpose Reusable Respirator 65021 is recommended for use with certain non-harmful sprays and vapors from stains, varnishes, coatings, and sealants. It is also suitable for wood sanding, polyurethane application, and pesticide spraying
Reusability	Reusable
Size	Medium
Special Features	NIOSH-APPROVED OV CARTRIDGE WITH P100 FILTER filters at least 99.97% of solids and liquid aerosols as well as certain organic vapo
Style Number	65021H1-DC
UPC	051141902777
Unit Count	1 Count
Warranty Description	Limited Warranty. This 3M product will be free from defects in material and manufacture. If this 3M product is defective, your exclusive remedy shall be, at 3M's option, replacement of the 3M product or refund of the purchase price of the 3M product. This warranty gives you specific legal rights, and you may have other rights which may vary from state to state, or country to country. To obtain war…

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Excellent communication throughout the order process. Product is perfect.

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The delivery time was excellent, and the packaging was secure.

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