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Search: Posts Made By: Dale M.
Forum: Safety 2013-10-07, 7:14pm
Replies: 28
Views: 35,868
Posted By Dale M.
Several things I am concerned with..... Make up...

Several things I am concerned with..... Make up air duct is only 8 inch where exhaust duct is 12 inch.... Make up air duct should be same size as exhaust, when doing fan calculations its easier...
Forum: Safety 2013-09-05, 3:58pm
Replies: 28
Views: 35,868
Posted By Dale M.
As long as a clean air flow is past your face and...

As long as a clean air flow is past your face and going out exhaust and torch fumes are going out exhaust, you are about as safe as it gets....

Dale
Forum: Safety 2013-09-05, 8:14am
Replies: 28
Views: 35,868
Posted By Dale M.
Air flow takes path of least resistance, that is...

Air flow takes path of least resistance, that is the door if its open, second is duct if door is closed....... Its that simple....


Dale
Forum: Safety 2013-09-04, 7:47am
Replies: 28
Views: 35,868
Posted By Dale M.
Evidently there is a misunderstanding about duct...

Evidently there is a misunderstanding about duct sizing....

http://www.artglassanswers.com/forum/viewtopic.php?f=12&t=273
...
Forum: Safety 2013-09-03, 7:09am
Replies: 28
Views: 35,868
Posted By Dale M.
Air flow takes the path of least resistance.......

Air flow takes the path of least resistance.... Mother nature has decided the door has less resistance to air flow than your duct work..... See other discussions (in Safety and Studio threads) about...
Forum: Safety 2013-09-02, 5:20am
Replies: 28
Views: 35,868
Posted By Dale M.
Make up air inlet duct is to small and to many...

Make up air inlet duct is to small and to many bends.... Same rules apply for make up air as exhaust, large diameter tube (should be same size as exhaust), minimal bends ... Though its NOT...
Forum: Safety 2013-07-23, 5:20am
Replies: 28
Views: 35,868
Posted By Dale M.
In all the calculations, the total length of duct...

In all the calculations, the total length of duct has to be figured in the calculations....

If you have 10 feet of exhaust, and 22 feet of fresh make up air, you have to do all calculations as 32...
Forum: Safety 2013-03-12, 12:21pm
Replies: 28
Views: 35,868
Posted By Dale M.
As long a opening for makeup air is equal to or...

As long a opening for makeup air is equal to or larger than your exhaust (duct) you are probably ok... Just remember any duct work that is part of make up air is part of your ventilation "system"......
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