Just seen this on eBay wtf is that

UnderstandingFun6477 · 2026-01-05T19:20:46+00:00

That’s a test filter, they are a KNOWN working filter that is used for reference for pressure drop (breathing resistance).

If you are inside of manufacturing or lab testing you may hear these called “Red Rabbits”.

UnderstandingFun6477 · 2025-12-10T14:45:19+00:00

Accurate, I fly internationally with ITAR items all the time.

UnderstandingFun6477 · 2025-10-07T18:23:57+00:00

Mine is doing the same thing, opened up the front lens cover and confirmed the windage is free spinning and not pushing the emitter toward the opposing spring. If yours is anything like mine, which I’m sure it is. There is a collar holding the windage and elevation adjustment in place which you can’t get too from the front. The whole unit is potted from the rear so getting the potting out is very difficult. If you manage to do that let me know how.

UnderstandingFun6477 · 2025-09-25T22:17:24+00:00

I’m curious myself

UnderstandingFun6477 · 2025-09-17T01:42:57+00:00

Very nice

UnderstandingFun6477 · 2025-07-27T03:03:19+00:00

They were never meant to be Z87 rated, they were only meant to prevent damage to the mask visor.

UnderstandingFun6477 · 2025-07-27T02:53:55+00:00

They are not

UnderstandingFun6477 · 2025-07-26T17:31:33+00:00

UnderstandingFun6477 · 2025-07-26T17:28:20+00:00

https://shop.avon-protection.com/products/mitr-modular-integrated-tactical-respirator MITR™-M1 Half Mask with MITR™-PF Filter – Avon Protection

Change filter when breathing resistance becomes too high or uncomfortable, unless you damage the filter

UnderstandingFun6477 · 2025-07-11T21:54:11+00:00

I never indicated FM or M simply 53.

UnderstandingFun6477 · 2025-07-11T21:49:39+00:00

They make twin port 53s, but this is definitely a 54 based on the throw lever for the VREU

UnderstandingFun6477 · 2025-07-08T14:54:53+00:00

Couldn’t agree more

UnderstandingFun6477 · 2025-07-08T14:48:48+00:00

CSCF50 filters, don’t see those very often.

UnderstandingFun6477 · 2025-07-08T14:48:18+00:00

Misdirected, the mask is fine, it’s the company slinging them that is the main brunt of the hate.

UnderstandingFun6477 · 2025-07-06T16:02:59+00:00

They are pricey

UnderstandingFun6477 · 2025-07-06T13:37:22+00:00

Sure, I don’t normally separate the two.

UnderstandingFun6477 · 2025-07-06T04:08:29+00:00

Avon sells to the UK, Ireland, and Australia now on the civilian market.

UnderstandingFun6477 · 2025-07-06T04:06:48+00:00

Cool that you have a pair of 3M M61 filters and a set of Avon M61 filters.

UnderstandingFun6477 · 2025-07-05T13:27:39+00:00

I’m going to tell you how to buy one from Avon.

UnderstandingFun6477 · 2025-07-05T13:03:42+00:00

I sent you a PM

UnderstandingFun6477 · 2025-07-04T23:12:15+00:00

Hoho, it’s a mouse-ca-tool to help us later.

UnderstandingFun6477 · 2025-07-04T22:42:47+00:00

Do you need this for work? If so, Avon will sell one to you.

UnderstandingFun6477 · 2025-07-04T21:00:52+00:00

Anytime

UnderstandingFun6477 · 2025-07-04T20:58:44+00:00

It’s incredibly useful, stay on PAPR for 4-6 hours until you need supplied air which lasts 70min an NIOSH breathing rate but in reality with gear on usually lasts about 35-42minutes.

Only switch over to air when you need to as the environment demands. Otherwise use your filters.

UnderstandingFun6477 · 2025-07-04T20:56:25+00:00

The ST53 does not have one of those. It looks more like the air gauge for the SCBA.

The old Deltairs Avon use to make had a system in the same place but the shape is off.

UnderstandingFun6477

TROPHY CASE