|Forum topic by Ziffster||posted 03-20-2013 02:26 PM||1700 views||0 times favorited||24 replies|
03-20-2013 02:26 PM
Dust collection has advanced significantly in the past few years yet most comparative reviews I can find are from nearly 10 years ago and many of those fail to provide meaningful data.
Has anyone seen any good comparative information regarding the best bang for your buck in dust collection that actually works? I would love to go with a cyclone but at $1500 for the ones which are proven to work properly they are about twice what I have budgeted.
What do I mean by meaningful?
(1) Actual performance curves (CFM versus Head Loss) so I know that the unit I choose will be able to deliver 1000CFM connected to real ductwork which I have calculated to have about 7” of losses at 1000CFM. My current DC is rated at 1700CFM but when connected (2 car garage sized shop with about 30’ of 6” trunk and 6’ of 4” flex to the machine) the CFM drops down below 500 CFM.
(2) Filtering efficiency (does it remove the most dangerous dust from the air – dust in the 0.5 to 4.0 micron range). Simply quoting manufacturer claims doesn’t provide me with much confidence with how easy it is to distort the facts.
For example, one vendor states ‘Proven to remove 99.9% of the particles in the air down to 0.5 micron” but upon talking with them they admitted how they ‘proved’ their claim was with material collected from a planer. Think about this for a minute – perhaps 99.5% is large stuff like chips with only 0.5% being dust. A little math and what the numbers actually indicate is that they only collect 80% of the dust.
When asked what they meant by “What do you mean ‘collects down to 0.5 micron?”
They came back with ‘The smallest particle size we have found our filer captures a statistically significant proportion of is around 0.5 micron.”
They wouldn’t elaborate further – so (as an engineer) this means the capture rate on small particles could be as low as 5% or perhaps even less.