Don't put the CART before the HORSE!
There are many woodworkers that buy a dust collector on the basis of a CFM number. Unfortunately,
the air volume they are given is called "free air delivery", that means, there is not any pipe
attached to the dust collector. This CFM number may very well be enough air to evacuate the
machines, but when you add pipe to the collector you add resistance (static pressure). When
resistance is put on a collector, the CFM delivery decreases. The actual air delivery of a dust
collector is typically half of the "free air" factor once it is piped in. It is important to first
find out your systems CFM and RESISTANCE (static pressure), then purchase the right collector.
A dust collector must be able to overcome the piping resistance and pull vacuum from the machines
you need to operate simultaneously. For more detailed information see pages 10-13, where you will
find instructions on "Designing Your Dust System."
How do you make pipe connections?
We use the small-end (male-end) and large-end (female-end) method of connecting the components.
This is similar to the way plumbing fittings are connected. Fittings and small-end couplings are
male-end to slip into pipe and flexhose. A large-end coupling (COU2) is used to make
fitting-to-fitting connections. A small-end coupling is used to connect sections of pipe (COUP).
Secure the connection with pop-rivets and silicone caulking. Wipe the silicone around the outside
of the connection. By making a chemical bond, the silicone makes the connection airtight. Later
if you wish to change your system, using a razor blade you can easily cut the silicone.
We also have other options for connecting the components. There are Easy Connect Sleeves (ECS) and
Inside/Outside Couplings (IO). For larger systems we recommend our Angle Rings (RING and RING-U).
See pages 18-19 for more information. Also for an easy way of coupling flexhose you can use our
Quick Flexhose Disconnects (QFD), page 39.
So, you can fabricate fittings just like my local sheet metal shop?
Yes, Faster, Stronger, and more Cost Effective! When you need custom dust collection components
just make a sketch of your requirements, with sizes of each opening, the length and width and if
required mark openings small end for pipe or hose and large end for a fitting.
Air Handling Systems is your local sheet metal shop. Fax your request to (800) 438-7135 for
fast fabrication and delivery at a sensible cost.
I'm a small shop will you sell direct to me?
We sell directly to individuals, and companies of all sizes. Even, if just a few parts are
required for your system, we can service your needs. Place your order by phone, fax, mail or
online at www.airhand.com. We accept all major credit cards: MasterCard, Visa, or American Express.
We ship most orders within 48 hours.
Can plastic PVC be used for dust collection?
NO! PVC pipe will create static electric sparks which will create an explosion and fire and possible loss of life.
DON'T be one of the INSURANCE statistics, do it right the first time.
Continued on page 38...
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