I'm new in the vacuum infusion so I have a few questions.
I want to make a composite part and for the female mold I'm gonna use a fire scale diam. 80 cm. depth 14 cm. I had the idea to make a box around in formica so I have a flange to attach the vacuum bag. Can you give me some advice about the position for installing the vacuum and infusion line. Do I place the infusion connector (with or without spiral tube) in the middle of the part or on the flange? For the vacuum line, is a connector enough or better in combination with a spiral tube?

I would increase the amount of spiral around the resin feed to make a nice U shape going at least half way across the mould. You don't normally need spiral on the vacuum side as long as the vacuum port is on the edge of the cloth and peel ply.  As per the video you could even make a resin break. 

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant