ke_ch Posted August 12, 2009 Share Posted August 12, 2009 how to draw the offset of a duct? if my duct goes to one way and then has to offset 90 degree. what is the radius should the round connection be? Did anybody have any example? Quote Link to comment Share on other sites More sharing options...
mdbdesign Posted August 12, 2009 Share Posted August 12, 2009 2 x dia of duct??? Quote Link to comment Share on other sites More sharing options...
ke_ch Posted August 12, 2009 Author Share Posted August 12, 2009 2 x dia of duct??? what about if I want to connect a branch duct to a main duct which is bigger than the branch duct Quote Link to comment Share on other sites More sharing options...
mdbdesign Posted August 12, 2009 Share Posted August 12, 2009 Use reduction or something like on picture Quote Link to comment Share on other sites More sharing options...
chelsea1307 Posted August 12, 2009 Share Posted August 12, 2009 no need to reduce your main to branch off with something smaller. Quote Link to comment Share on other sites More sharing options...
CADMASTER1128 Posted August 12, 2009 Share Posted August 12, 2009 I don't know if this will help, but this is how I draw my HVAC ducts. Drawing organically drawn by StykFace. Quote Link to comment Share on other sites More sharing options...
mdbdesign Posted August 12, 2009 Share Posted August 12, 2009 ...or something like this: (just learn how to add picture:-))) ) Quote Link to comment Share on other sites More sharing options...
chelsea1307 Posted August 12, 2009 Share Posted August 12, 2009 learn something new everyday, ive never seen branch off a reducer Quote Link to comment Share on other sites More sharing options...
tzframpton Posted August 12, 2009 Share Posted August 12, 2009 learn something new everyday, ive never seen branch off a reducer This is very common in the HVAC industry. Granted its a custom fitting that usually costs more which can drive up bid price, but for very widely used sizes, this is definitely common. Quote Link to comment Share on other sites More sharing options...
tzframpton Posted August 12, 2009 Share Posted August 12, 2009 what about if I want to connect a branch duct to a main duct which is bigger than the branch duct Are you using MEP or plain AutoCAD? Quote Link to comment Share on other sites More sharing options...
chelsea1307 Posted August 12, 2009 Share Posted August 12, 2009 Granted its a custom fitting that usually costs more which can drive up bid price, . could be why i havent seen it, we do a lot of schools and they have to take the lowest bid, so we avoid custom things that can be done with standard parts Quote Link to comment Share on other sites More sharing options...
mdbdesign Posted August 12, 2009 Share Posted August 12, 2009 Sometimes it is just impossible to avoided Quote Link to comment Share on other sites More sharing options...
tzframpton Posted August 12, 2009 Share Posted August 12, 2009 Sometimes it is just impossible to avoided Not only that, but a 12x10x8 fitting is a standard catalog fitting which doesn't fall under the "custom" fitting part of a duct manufacturer. But a 16x8x6 would be because its FAR less used than the other, so a duct manuf. would have plenty of stock of the typical ones used. Quote Link to comment Share on other sites More sharing options...
Tankman Posted August 14, 2009 Share Posted August 14, 2009 Years ago I was a layout man for industrial duct work. I was surprised when we fab'd duct to move cotton around a processing plant. Cotton would wear out the duct very fast, we reinforced the duct with heavy steel which the cotton would polish the inside of the duct, and soon, blow out the fittings. Quote Link to comment Share on other sites More sharing options...
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