The Ventelation Challenge - Should You Choose To Accept It

[LampworkbyLori]

I've studied the 3 or 4 forums that cover lampworking and I just keep more and more confused.

I plan to have my island-style hood and vent built and installed by a local HVAC person, but like everybody says, we're the ones who need to come up with the design.

Here are my basic requirements:

1. Island-style hood that backs up against a wall with adjustable chains for hanging. (No pre-conceived dimensions, baffles OK)
2. 115 V Squirrel cage fan.
3. Smooth ducting (non-flexible), about 4'-6' straight up from the hood.
4. One 90 degree turn at the top to the outside wall.
5. Finish off the ducting by converting the round or rectangular ductwork to a rectangular exit (2" x").
6. screen and flexible louvers (on the rectangular vent cover).
7. No 10" ducting! I have to drill through brick and need to make as small a hole as possible (hence the rectangular exit duct).

Your mission, should you choose to accept it, is to design a vent system based on this info. If you can back it up with facts/calculations, and I use your plan, I'll pay you $10.

[MikeAurelius]

Lori - there is going to have to be a big enough hole in the brick wall - no way around it, sorry.

How large is the hood?

[LampworkbyLori]

Can the hole be rectangular? If so, what dimensions?

The hood can be any size.

[MikeAurelius]

Minimum rectangular dimensions is going to be around 6" deep by about 9" wide, but I'd have to verify that based on the size of the hood.

[LampworkbyLori]

I think I need to be more specific in what I'm asking for. If you could design a vent system with only the restrictions I've mentioned, how would you do it?

What size would you make the hood?
What fan would you attach (model number)?
What would be the minimal diameter non-flexible tubing required with one 90 degree bend?

I have all of these variables at my disposal in order to build the best system for me and my bobcat. I think I can get away cheaper than buying the Glasscraft hood by hiring an HVAC person to build from my specs.

By the way, am I going to loose anything by having louvers on the vent duct?


Thanks!

[MikeAurelius]

I think I need to be more specific in what I'm asking for. If you could design a vent system with only the restrictions I've mentioned, how would you do it?

Sorry, no. An exhaust system cannot be designed under those restrictions.

[boroburner]

Sounds like you are going to have to have a mason in to make a larger hole for you. or maybe you could go with a couple of smaller holes?
Have a look at Carlsile's website i think they have pics of their hood on the site. Ive heard that it is an amazing setup, and works extremley well.
B

[LampworkbyLori]

Thanks all for the great input and information! Additional info welcomed.

[boroburner]

do you have a window near your work station?
if so you could run the air out of it.
-do you know the CFM of your fan?
-what do you intend to make? ie, beads, or bigger stuff?
B