(click here) If you notice, in my growroom I use plexiglass (from Home Depot) since it's lighter and I can cut-n-drill the stuff for easier hanging and adjusting. Just don't let the fan blow the heat down twords the plants, and don't get it close enough to melt the plexiglass. And yes, it's effective.

When drilling plexiglass, go slow or it will crack. Thicker is better. Avoid scratching it too much, but keep it clean.