You need one of these then.
It is a standard Coltri tower with yoke inlet and outlet.
This is just more smoke and mirror rubbish. All the test results from these “personal filters” has ranged from grossly inadequate to totally useless for a number of reasons.
Most of their problems are based on dwell time and gas velocity, resulting granted in some alterations to the outlet spigot hole diameter to reduce flow velocity in some later variants.
However with these “personnel filters” from Coltri et al the basic idea is only to “polish” air that is already up to a breathing air standard, there is no capacity to handle air from a compressor that has failed air purity. Further there is no BPR back-pressure regulator and non-return valve so the shell is in effect filled and discharged of pressure very rapidly at each and every fill. When not in use the shell is stored empty of pressure, allowing the chemical to rapidly degrade.
This causes two detrimental effects:
1. It breaks down the chemical into powder or dust by the rapid decompression
2. The lack of a BPR reduces the already inadequate amount of chemical to adsorb
3. Coltri et al the suppliers fail to address the fact that oil particulate is adsorbed not absorbed so dirty long chain hydrocarbons adsorbed by the new chemical are simply desorbed back out into the next cylinder being charged.
The advantages of using the original posters idea of a small standard size filter shell is obvious:
1. Greater weight of, greter amount of, and greater volume of chemical.
2. Lower gas velocity as the diameter of the pressure front is lowered by the greater diameter of the filter cartridge chemical.
3. Longer dwell time as the length and diameter ratio of the standard 60 to 70 mm diameter cartridges is greater.
4. Ability to filter air to a recognised breathing air standard even when the main compressor filter fails or is is totally spent for at least 12000 cu ft of process (with BPR) about 150 cylinder fills.
IMHO this is the main reason why these products are called “Personnel Filter” it is frankly a bull**** statement They should be tested as filters under a recognised breathing air standard and not allowed to be sold to unsuspecting users. Or change the name to “Placebo Filter”. Just a thought LOL Iain Middlebrook