I finally decided to set up a workshop in my basement to pour soft plastics. I read a number of posts on this site and others about the requirements to vent the fumes when pouring soft plastics. I started with a kitchen fume hood as I've seen many people use after a neighbor was doing a kitchen remodel. After reading a number of conflicting posts, searching the web, calculating serveral different measures for CFM, including considerations on duct lenght/width, static pressure etc, I learned about the limitations of the kitchen hood set up and decided to build my own custom hood based on designs I've seen.
Below is a picture of the current state of my project, a 36" x24" x 6" fume hood,. The bottom of the hood is 24" off the surface of the bench with 8" duct pipe converting to 6" after an 8" in-line duct fan (500 cfm) I found at Lowes for $32. The 500 cfm turned out to be a bust as it was designed to move air in a vent at 0 static pressure and doesn't pull the air up any better than the kitchen hood I started with. I'm looking for a fan that pulls around 500 cfm but I'm not sure what kind of fan is needed fo finish the project. I believe a squirrel cage type fan may be the right way to go. The hood space is 36" x 24" x 24" and I would like to consider using without sides, just the sheet metal in the back if posisble. any recommendations on what type of fan to get and where? I'd like to get one for around $100 if possible.
Here is another photo showing the underside of the hood.