Mike Bremner":m8ur5zsa said:
Any reason you want a powered one and not a 3M one with replaceable filters for example?
Having used all options, I'd say powered hoods are the ultimate option for user comfort in extended use and offer a higher level of [theoretical] protection... I really rate the 3M gear including their powered hoods hoods (though they're prohibitively expensive)
Powered Hoods by design need much bigger filters to deal with the volume of air moved, which makes them both more expensive and more shortlived (as they're always filtering, not just on inhalation), which is the major downside...
My real question is why you feel RPE is required at all... Is it really that dusty
and you have no way to minimise the dust or remove the dust producing process?
Serious dust protection like these options is very rare in industry, because it's widely identified as both better for health and cheaper to either collect or not produce hazardous amounts of dust to start with, I really feel that this is something which is missed in the great dust discussion,
Don't spend money on an expensive mask which takes expensive filters or an alarmingly frequent basis, until you've minimised the source of dust to begin with.
I appreciate this doesn't address the OP's question directly, but hazardous atmospheres and health protection have become pet subjects from my professional life...