We now have access to Australian made fans from one of the major fan suppliers and we have the fan engineering expertise and experience to help our customers in selecting the right fan for the job.

To select the right fan you need to, at the least,  know the volume of air you want to move plus the pressure the fan must work at to move that air. We are not talking of little bathroom ceiling fans (you usually only need to know only the volume there), but of larger fans connected to duct systems. You also need to consider noise, safety, efficiency and other things like available space, maintenance, etc.
Follow this link for more information: Fans

Hi,
We are building a seperate site with about 30 pages of serious information on the pneumatic vacuum cleaners we sell.
Check it out at http://power-vacuum-cleaners.com
There could be a solution for your waste problem, or maybe you worry a little bit about the condition of the water in your rainwater tank.
Maybe you want to shift some powdery product from one container to another, or suck up slurry or orther liquid from a hole in the ground.
See you there,
Johan