questions about using a hood fan for ventilation
I have been working on my ventilation, I had a box built and it had plexiglass on three sides and open on the front and my fan wasn't strong enough - I need a 700 cfm fan. Instead of getting a squirrel cage fan I bought a hood fan that is 760 cfm and I took the filter out, my question is how high should the fan be installed above the table and do you still need the box around the fan. I am confused because sometimes I see people with some sort of hood above without a box. We installed the fan at the top of the box, I have to find my tape measure to see how high it is, but the flame is dancing around and if I torch for very long it make me feel funny. We are going to work on it this weekend and I have some smoke bombs to check the air flow. I noticed I do need to seal the window better where the fan is vented out - the pipe is 8". The window behind where I get fresh air does have a fan in the window that is not used do I need to take it off the window and just have the screen there? Also if I move the hood up higher I might have to vent out the roof, straight up- would that be better? This is so confusing and I know how important it is to have good ventilation. Also, how big of an opening do I need in the air flow window for 760 cfm - if it is to large would it be better to block the bottom or the top half of the window?
Thanks Pam
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