Every figure below names its source. Each one is a manufacturer
specification read off the listing itself. The judgments are ours.
Two microns
The finest filtration rating published on the American half of this shelf.
Thirty microns on the Rockler here. Five on both WEN machines. Two on this one.
The fraction you cannot see
Chips on the floor are a nuisance. The dust that matters is the part that never
lands.
Wood dust is classified as a Group 1 carcinogen by the IARC, and the particles
that reach the deep lung are below about ten microns — which is to say, invisible
in a shaft of sunlight through a workshop window.
So the number that decides what a collector is worth is not its airflow. It is
what its filter stops. A machine that moves a great deal of air through a coarse
bag is a machine that measures the room’s dust and puts it back.
And two microns is still a bag
Not a cartridge, and not a tested machine.
A cloth bag catches what its weave catches and leaks at the seams and the clamp
as it loads. The published Metabo on the European half of this shelf is bought
on a letter instead — class M, tested as a whole machine rather than as a filter
medium, and its page calls the letter the specification.
Two microns is the right direction. It is not the same kind of claim.
Seven amps, published
The only tool-current limit on either half of this shelf.
Seven amps at 120 volts is about 840 watts: a random orbital sander, a router, a
biscuit joiner, a small band saw. Not a table saw, which draws 13 to 15. Not a
planer. Not a 2 HP router on startup.
So the auto-start outlet serves the small end of the shop, and the big machines
switch the collector by hand.
The published Einhell on this shelf has tool-triggered start and does not say
what it carries. Nor does the ECOMAX here. This page does.
Seven hundred and eighty in, eight hundred and ninety-five out
Both numbers are on the page: 6.5 A full load at 120 V, and 1.2 HP.
Six and a half amps at 120 volts is about 780 watts drawn. One point two
horsepower is about 895 watts delivered.
A motor of this size is perhaps seventy to eighty per cent efficient, so 780 in
is 550 to 620 out — about 0.8 HP.
The two WEN collectors on this shelf publish amps and claim no horsepower. That
is the position that cannot be contradicted by its own page.
CSA listed
The only safety certification published on either half of this shelf.
It is a third-party listing of the electrical construction, and on a 120 V
machine with a switched outlet in it that is the part worth having certified.
The European machines here publish dust classes, which are a different kind of
third-party number — and no machine on this shelf publishes both.
Availability
Read on the day this page was built: $269 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-07. The live price is at the top of the page.