CraftWEB Hot Glass Talk  

Go Back   CraftWEB Hot Glass Talk > Hot Glass > General Hot Glass Discussion

Reply
 
Thread Tools Display Modes
  #1  
Old 03-13-2018, 03:09 PM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
I forget....

what is the suggested CFM for an exhaust hood above a furnace and glory hole?

Its been 17 years since I built a studio and its an eye opener to realize how much I have forgotten about these little details.
__________________
<eben epoiese>
Reply With Quote
  #2  
Old 03-13-2018, 03:14 PM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
To further explain what I am designing....

I can't do large wall mounted fans behind the equipment and would have do do a rectangular hood with a plenum that leads to a 12" duct to an opening though the wall. Im thinking a 12" inline duct fan would have to be used to suck out air from the hood, and might even use 2 ducts.
__________________
<eben epoiese>
Reply With Quote
  #3  
Old 03-13-2018, 03:27 PM
Kenny Pieper Kenny Pieper is online now
Registered User
 
Join Date: Feb 2003
Location: Burnsville N.C.
Posts: 805
Kenny Pieper is on a distinguished road
If you can do one large one that turns slow rather than a number of small ones that turn fast it will be much quieter.
Reply With Quote
  #4  
Old 03-13-2018, 04:50 PM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 20,005
Pete VanderLaan is on a distinguished road
Kenny is right. The difference between 12 and 16 is huge. Make that hood as small as you can and insulate it as well as humanly possible using dead air spaces. Crank the exhaust up. You will love this advice when you fire it. Spare little expense on that hood. You may spend 20 years swearing at it or by it.

We sit in my shop and it's a little cold very often/ We turn the vents down. You can splurge, come up and see.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #5  
Old 03-13-2018, 07:20 PM
Max Epstein Max Epstein is offline
Registered User
 
Join Date: Sep 2016
Location: Tallahassee, FL
Posts: 154
Max Epstein is on a distinguished road
Wet Dog has an excel spreadsheet. I'll Facebook it to you when I get home in the next couple days.
Reply With Quote
  #6  
Old 03-13-2018, 11:42 PM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Thanks guys.

I hear you on the larger fan Kenny. The issue is my land lord at the new place is having a hard time with the thought of cutting a large hole in the wall. 16 might be too big for his britches.
__________________
<eben epoiese>
Reply With Quote
  #7  
Old 03-14-2018, 08:03 AM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 20,005
Pete VanderLaan is on a distinguished road
I have three holes all 24's. I use two and don't need the third. The goal was insulating the hood and I mean really insulate it and then do your air changes based on the cubic capacity of the hood. The key is the number of fresh air changes per minute. Once every two minutes makes for a rather warm shop. Once a minute is an improvement. If you recall the Santa Fe system, it changed the room air once every 20 seconds and that was not for just the hood it was a room 24x24 x16.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #8  
Old 03-14-2018, 08:22 AM
Brian Graham's Avatar
Brian Graham Brian Graham is offline
Registered Abuser
 
Join Date: Mar 2004
Location: Canal Fulton - Ohio
Posts: 478
Brian Graham is on a distinguished road
Is there a window opening that could be used partly or in whole? If done right the window could be restored back pretty easily. Looks like you have no shortage of space to store a window or part of one.
__________________
The revolution will not be televised.
Reply With Quote
  #9  
Old 03-14-2018, 02:52 PM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Quote:
Originally Posted by Brian Graham View Post
Is there a window opening that could be used partly or in whole? If done right the window could be restored back pretty easily. Looks like you have no shortage of space to store a window or part of one.
Not gonna happen. I tried.

Pete- I remember Santa Fe. You could barely open the doors when the fans were on. It was like trying to battle Hal to get into the pod bay in 2001 space odyssey
__________________
<eben epoiese>
Reply With Quote
  #10  
Old 03-14-2018, 03:21 PM
Kenny Pieper Kenny Pieper is online now
Registered User
 
Join Date: Feb 2003
Location: Burnsville N.C.
Posts: 805
Kenny Pieper is on a distinguished road
The fan under my the hood is 36" turns relatively slow but moves lots of air. You can hardly hear it. It has louvers when closed will keep the cold air out in the winter and when they are open without the fan on they allow much of the hot air to escape without the fan being on.
Reply With Quote
  #11  
Old 03-14-2018, 04:50 PM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 20,005
Pete VanderLaan is on a distinguished road
Kenny and I are attacking the same demon from different directions. Both work. I was working against serious toxins. If all you melt is clear, you can plan for that. I hope you want to do more and plan for more. I''ll always be here as an advisor.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #12  
Old 03-14-2018, 05:31 PM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Quote:
Originally Posted by pete vanderlaan View Post
kenny and i are attacking the same demon from different directions. Both work. I was working against serious toxins. If all you melt is clear, you can plan for that. I hope you want to do more and plan for more. I''ll always be here as an advisor.
im going to melt color!!
__________________
<eben epoiese>
Reply With Quote
  #13  
Old 03-14-2018, 05:46 PM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Im thinking i will do 40 lb melts and roll it out into Bar. we use a lot of opaque yellow, Ivory and copper blue. It makes sense to me to just roll it out as opposed to gather it hot as I can then turn the color pot off when its not in use as opposed to leaving it on to use as a convenience.
__________________
<eben epoiese>
Reply With Quote
  #14  
Old 03-14-2018, 06:52 PM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 20,005
Pete VanderLaan is on a distinguished road
Opaque yellow is... cadmium? How do you use it. The real point of color from the pot is direct use.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #15  
Old 03-14-2018, 07:21 PM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Quote:
Originally Posted by Pete VanderLaan View Post
Opaque yellow is... cadmium? How do you use it. The real point of color from the pot is direct use.
Not selenium ? Ill have to review my notes.
__________________
<eben epoiese>
Reply With Quote
  #16  
Old 03-14-2018, 08:16 PM
Jordan Kube Jordan Kube is online now
?
 
Join Date: Aug 2003
Location: Seattle, WA
Posts: 1,590
Jordan Kube is on a distinguished road
You may be disappointed with how much bar a 38# pot produces. Its best use is hot. Your labor spent making bar brings the price much closer to commercial color.

Any color pot is better than no color pot though! Do what you want with it
__________________
WWUD? Think for yourself.
Reply With Quote
  #17  
Old 03-15-2018, 05:17 AM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Quote:
Originally Posted by Jordan Kube View Post
You may be disappointed with how much bar a 38# pot produces. Its best use is hot. Your labor spent making bar brings the price much closer to commercial color.

Any color pot is better than no color pot though! Do what you want with it
Ah you are right. Back to the drawing board
__________________
<eben epoiese>
Reply With Quote
  #18  
Old 03-15-2018, 07:43 AM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 20,005
Pete VanderLaan is on a distinguished road
I agree with Jordan. The real point of hot color is time saved in making work coupled with your being able to use excessive amounts of color. I admit to occasionally making a bar or two from a pot if it's to be used for thread but otherwise it's inefficient. An 80 lb pot is the smallest for making bar and then it makes sense only if you're selling bar.

And it most definitely is cadmium. Selenium will make a peach or a brown depending on the base glass. Copper will most definitely not be happy around cadmium. If it's been in a pot, you'll never get a nice yellow from the pot again. More like mustard.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #19  
Old 03-15-2018, 08:01 AM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Points taken. First things first though.. I have got to move, set up the new hood and plum in gas and electric. I have an old pottery kiln that I am going to convert into a color furnace... maybe. Or o might just make a brand new spiffy mini melter.
__________________
<eben epoiese>
Reply With Quote
  #20  
Old 03-15-2018, 08:59 AM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 20,005
Pete VanderLaan is on a distinguished road
don't make it electric unless you have no other choice. Color and electricity are unfriendly with each other. You could do a little safety system like the one I described with the BASO valve.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #21  
Old 03-15-2018, 09:23 AM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Quote:
Originally Posted by Pete VanderLaan View Post
don't make it electric unless you have no other choice. Color and electricity are unfriendly with each other. You could do a little safety system like the one I described with the BASO valve.
Yes. I know that. The base valve is a good idea.
__________________
<eben epoiese>
Reply With Quote
  #22  
Old 03-15-2018, 10:33 AM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 20,005
Pete VanderLaan is on a distinguished road
Dudley sells them. You need a high pressure one. He has a very nice stainless steel needle valve too
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #23  
Old 03-15-2018, 11:33 AM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Quote:
Originally Posted by Pete VanderLaan View Post
Dudley sells them. You need a high pressure one. He has a very nice stainless steel needle valve too
For natural gas?
__________________
<eben epoiese>
Reply With Quote
  #24  
Old 03-15-2018, 01:02 PM
Pete VanderLaan's Avatar
Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
Posts: 20,005
Pete VanderLaan is on a distinguished road
The standard BASO or generic is used on hot water heaters which normally run household pressure of perhaps 6 oz. I woud certainly hope your new shop can have 2lb from the meter with a good sized orifice so it can flow at least 750K BTU's. That, in a baso value would be high pressure. Most services require special permitting to have more than 2lb in a building.
__________________
Where are we going and why am I in this basket?
Reply With Quote
  #25  
Old 03-15-2018, 02:06 PM
Eben Horton Eben Horton is online now
Registered User
 
Join Date: Apr 2002
Location: Wakefield, RI
Posts: 4,212
Eben Horton is on a distinguished road
Ahhh. Ok. That makes a lot of sense.
Thanks pete. All this is going to take time
__________________
<eben epoiese>
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 12:50 PM.


All published comments within these message boards are the opinions of its contributor and does not represent
the opinion(s) of the owner(s) of this website. Please see the Terms of Use file for more details.

Books to Help Artists Avoid Online Scams: Top 10 Email Scams | Social Media Scams

Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
CraftWEB.com. Opportunity Network. 2008. All Rights Reserved.