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Post subject:Straight Offset vs. Mitered Offset
 Posted: Aug 10, 2006 - 04:25 PM #5116
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Joined: Jun 28, 2006
Posts: 12
Location: Des Moines
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Hopefully this is the right forum.
Which is better? I've heard both sides....
Mitered is better because the actual dimension doesn't change.
Mitered is not better because it increases the actual offset in a shorter distance.
Any thoughts?
Shon |
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Post subject:mitered offset versus straight sided offset
Posted: Aug 11, 2006 - 02:17 AM #5119
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Power User
Joined: Sep 16, 2003
Posts: 213
Location: McEwen, TN.
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I believe this is what Shon is refering to..see attached drawing..
8" offset on a 12" duct within 16" Drawn both ways. I think I would prefer
the mitered offset..Not an expert speaking,tho.......
"smart too late; old too soon"
bordontn |
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Post subject:RE: Straight Offset vs. Mitered Offset
Posted: Aug 11, 2006 - 03:36 AM #5120
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Joined: Feb 12, 2006
Posts: 25
Location: Winnipeg , Manitoba, Canada
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| I prefer the mitered offset as well. If i remember correctly anything offseting more than 15 degree should be mitered or if one wants to do one better go with a radius offset. |
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Post subject:RE: Straight Offset vs. Mitered Offset
Posted: Aug 11, 2006 - 12:21 PM #5121
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Joined: Jun 28, 2006
Posts: 12
Location: Des Moines
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bordontn nailed it with that drawing. Is there anyway to calculate the CFM that can be moved through each offset, according to the degree of the angle?
Just food for thought.
Shon |
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Post subject:RE: Straight Offset vs. Mitered Offset
Posted: Feb 26, 2008 - 04:19 AM #7283
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Joined: Feb 26, 2008
Posts: 1
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hey buds, i'd like to know more or learn a lot regarding mathematical solution involving air duct fabrication. In my country there are no graphic calculator so far issued or on sales for consumption, I used my old scientific calculator that took me almost an hour to do a layout of one fitting( regardless of size & metal thickness). Would you or is there someone who could help me or teach do a little mathematical solutions on solving my problems regarding sheet metal layout.  |
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Post subject:RE: Straight Offset vs. Mitered Offset
Posted: Feb 29, 2008 - 11:02 AM #7301
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Power User
Joined: Feb 19, 2006
Posts: 131
Location: Texas
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Post subject:RE: Straight Offset vs. Mitered Offset
Posted: Feb 29, 2008 - 02:57 PM #7302
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Power User
Joined: Nov 13, 2007
Posts: 113
Location: Omaha, NE
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| In the bottom drawing the cross-section area drops a considerable amount off its original size. (See his 10-3/8ths measurement?) The actual restriction is also a factor of length. |
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Post subject:RE: Straight Offset vs. Mitered Offset
Posted: Mar 03, 2008 - 02:00 AM #7307
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Power User
Joined: Nov 01, 2006
Posts: 94
Location: McEwen,Tn.
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MattM...That top drawing...You could probably add 35-45 ft.in duct length. 12x12 @ .08 would be 800cfm/850fpm
The lower drawing @ .08 would be 800cfm/950fpm at that point..still have to add 35-45ft.for the offset restriction....
Sumpin like that. A longer radius offset would only add about 10 ft. to your total length.........a radius 45° is worth 5 ft.
bordontn2 |
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"Old too soon/ smart too late"
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