Plastic glass may bubble and discolor or even melt down if the temperature gets out of control. Single strength glass can be cut to fit by HD and will not cost you a bunch of money. Double strength glass is better only because it's easer to handle. Pick up some silver furnace heat tape to seal the edges of the hood to keep the air moving through the hood and not vent into the room. A Dayton blower works but they are a little noisy you can have HD order inline vent fans as long as the vent pipe run is not to long the inline fans can work.

It's better to push the air through a hood then it is to pull it through....fyi