Lampwork Etc.
 
Mountain Glass Arts

LE Live Chat

Enter Live Chat

No users in chat




Beads of Courage


 

Go Back   Lampwork Etc. > Library > Safety

Safety -- Make sure you are safe!

Reply
 
Thread Tools
  #1  
Old 2019-06-17, 3:05pm
sbas sbas is offline
Junior Member
 
Join Date: Jun 17, 2019
Posts: 1
Default Ventilators/fans question

Hi everyone

I´ve seen a variety of different types of fans with the same cfm but at very different prices. Usually inline fans are the most expensive while attic vents gable fans and simple exhaust fans are cheaper. So, if the cfm is enough, does it matter what type of fan I´m using? or do attic fans push instead of pulling air?

Thanks.
Reply With Quote
  #2  
Old 2019-06-17, 8:04pm
Eileen's Avatar
Eileen Eileen is offline
Loving learning
 
Join Date: Oct 11, 2010
Location: Florida
Posts: 11,649
Default

I cannot claim to be an expert, but for what it's worth:

I thought attic fans pulled out, but they are pulling the air up into your face. I always thought you wanted to draw it away from you and out.

The makeup air is really important, so figure out how it can come in and past you to vent the fumes away and out.
__________________
My current "hot" fantasy involves a senior discount on glass & tools!
Reply With Quote
  #3  
Old 2019-06-17, 8:20pm
Speedslug's Avatar
Speedslug Speedslug is offline
Phill
 
Join Date: Mar 21, 2009
Location: Winnebago, MN
Posts: 2,489
Default

Most fan cfm numbers are totally bogus.

Until you get up into the 2000 cfm range (and the associated big $$$) most of the numbers listed for a ventilation fan are pretty much twice or three times what they actually deliver if that.

I used the fan from my old house furnace rated for 100,000 btu for my 2100 square foot, 150 year old house.
It's a squirrel cage fan about a foot across and I am not real certain that it moves air fast enough or with the volume as I would prefer unless I decide to enclose the back and sides.
__________________
The Zombie Apocalypse is Upon Us.

Last edited by Speedslug; 2019-06-17 at 8:22pm.
Reply With Quote
  #4  
Old 2019-06-18, 11:56am
Subduction's Avatar
Subduction Subduction is offline
Member
 
Join Date: Jun 22, 2018
Location: WA
Posts: 45
Default

A fan specification almost as important as CFM is SP: Static Pressure https://www.dscr.com/blog/static-pressure-important/
A simple box fan on the floor might have high CFM but if mounted in a window and wind is blowing against that side of the building, the CFM might be nil.

A good quality fan will have a published CFM vs SP table or graph. I'd say the layout of your studio determines the design of fan to buy. If you need to go through ductwork, get an inline fan (although I haven't found any with metal (not plastic) impellers). The squirrel cage fans are typically better at blowing than sucking (although they can work well enough).

Myself, I bought a 1/4 HP commercial duty direct drive propeller fan to go in the window of my basement garage. I will be making a hood over the work bench to direct fumes to the fan. HVACquick.com is great to work with. Canarm sent me a previously returned fan and did not bother to properly repackage it for shipping. HVACquick gave me a generous partial refund for the bent corner that resulted.

Last edited by Subduction; 2019-06-18 at 12:04pm.
Reply With Quote
  #5  
Old 2019-06-20, 8:11pm
Alaska Alaska is offline
Alaska Boro
 
Join Date: Dec 10, 2009
Location: Anchorage, Alaska
Posts: 1,065
Default

Have been using a Soler & Palau T-250 Fan which fits 10 inch round duct in combination with a barley box. All installed in 2012 and is still performing well and without issues.

Folks are correct in that SP is a major factor in air flow. One must take into account, run length, number and type of elbows, etc to determine the overall CFM. And as pointed out, a window box fan is not an acceptable option for the lampworker.
Reply With Quote
Reply

Tags
fans, safety, safety questions, ventilation


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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 On
HTML code is Off
Forum Jump




All times are GMT -7. The time now is 10:19pm.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Your IP: 54.224.52.210