I've seen this done two ways, there is one I like much more than the other.
The first and easiest way is to have the
hazer set in
manual mode (were whenever it gets
power it heats up and then starts emitting
haze at a
preset level). In this case you would have only the
DMX relay patched into the board as a
non-dim. You would connect the
relay to some source of constant
power (could be a wall
outlet to save dimmers). The fan and
hazer would be plugged into the
relay. Then when the
non-dim channel for the
relay on the
console is given any value above 0% it powers up the
hazer and fan and a short time later you have
haze. This setup is easy, but has several problems namely the lack of control of exactly when the
haze will happen (there will be a delay because the
hazer has to heat up before it can emit
haze).
A better and more typical situation is to have the
hazer patched into the
console as well as the
relay. In this situation you still have the
relay plugged into any convenient constant
power source and the fan and
hazer plugged into the
relay. The only difference physically is the extra data cable running to the
hazer. In this case when you know you're going to want
haze soon (like say, at 15 minute
call before the show) you give the
non-dim channel for the
relay a value above 0% and leave it there until you're done using the
hazer (For instance, in the last
cue of the show). Then when you want
haze you bring up the
channel for the
hazer to the desired
level and it will more-or-less immediately start spitting out
haze at whatever
level you set it to. This is a much better situation both in terms of the health of your equipment and repeatability. Also you can potentially free up a
dimmer in your rack. I don't remember if an
Element can patch a
fixture profile, but even if it can't the
hazer should only be a
channel or two.
As a side note many
DMX controlled hazers have a place to
plug the fan into them so you can control both the
level of
haze emitted and how fast the fan spins. I'd look into that and see if you can do that with your setup. That way you don't have the fan spinning at full blast all show long.