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Is any of the duct weatherproofed?

1 1/4 radius will have a lower pressure loss than the 1/2 radius. Problem is the elbow gets larger and clumsier to handle and install. Square throat w\ vanes are labor intensive.

I didn't think you could use the fillet command on a 3D object

ctbailey, Will that work on 2004?

I'm using CutePDF Writer to convert to PDF format, I was wondering if there was a way to keep all the layout tabs that I plot in one file. Currently, if have to send someone a PDF, I have to send them a file of each layout tab. I have veiwed drawing pdf's like this before and I was wondering how...

Thanks Exxit, thats whats I wanted to know And thanks to everyone else. All replies where helpful

Hi, I was wondering if there are any advantages or disadvantages in regards to setting drawing limits. I never set my drawing limits, I also never have the grid toggle on either. Thanks

Were is the duct line going, in the attic or in the basement? I try to use round duct first, then square duct(aka 8x8, 10x10, etc.), and so on with a maximum ratio of 4:1. Use galvinized sheet metal. If it's ran in the attic, wrap the outside rather then linning the inside. The liner tends to...

Thanks for the comments, I think setting the drawing to read-only will be fine. I forgot where that read-only check box was. thanks again

Is there a way to make a drawing read-only? I'm finding that once in a while someone updates an outdated drawings by mistake and I would like to make sure this cannot happen anymore.

As well as ASHREA for technical development, try Trane and Carrier

Speaking from a SCUBA divers stand point, if I had to raise something without a mechanical hoist, I would use air bags. So if I had to lower it, I quess I would do the opposite. Start with inflated and deflat the lift bag. 40' isn't very deep, how accurate do you have to be with your location...

Go with 18ga. and cross-break all sides. If your only using those 2 peices(28" Long & 60" Long), go with 16ga., It's kinda over kill, but with so few peices I can't imagine there being a bit cost difference. However, like I said 18ga. cross-broken should be fine.

msb01, Give ruskin.com a try, or greenheck. They're a pretty commonm item.

Sounds like you'd want to use a fire\smoke damper.

Autodesk ABS, East Coast Software or Quickpen are all 3D and good

Running in the trusses is going to be difficult for the installer. What about putting the unit in the attic and running the mains in the attic space, then they won't have any problems running the branch lines in oval down the wall cavities.

Are you talking about the main trunk lines in the basement?