Flex Duct Support

[dbucknavich]

First time seeing this, 1-1/2 inch metal strap supporting flex duct. Always have just seen the nylon strap before. IRC refers to manufacturer's specs but I am having a little trouble finding something. While I look further, I thought I could get a quick answer here. Sorry for not havong a pic, but I have a new vista computer and have yet to figure out how to crop and resize. Thanks in advance.

[Michael R. Boyett]

Dylan...check your e-mail for a flex duct installation guide that may be of some help. It is too big to post here. It says 1.5" is acceptable.

[dbucknavich]

Thank you Michael. I wish I could show the picture. The straps look loke they are about to cut right through the duct. I can live with it though. I told the homeowner to pay me to come back each year to monitor.

[mnahrgang]

Originally Posted by dbucknavich

... Sorry for not havong a pic, but I have a new vista computer and have yet to figure out how to crop and resize. Thanks in advance.

Dylan,
I've been struggling with Vista and MS Office 2007 for a couple of months now too. Nothing seems to work as it should. I've found that if you open the image in MS Office Picture Manager you can click on the Picture menu. There is a Resize option on that menu. This will open a "resize" window on your screen and you can proceed from there.
Hope that helps.
Mark

[dbucknavich]

Mark,

That did it. Much obliged.

[David A. Andersen]

The straps look loke they are about to cut right through the duct.

If so, it is likely that the support spacing is inadequate.

[Humberto Carvajal]

This is the information I use in my reports if it helps you...

The Sheet Metal and Air Conditioning Contractors National Association (SMACNA) recommend that flex duct be supported with the following guidelines:


Ducts should not sag more than 1/2 inch every foot between supports
Support straps should be spaced no farther apart than 5 feet
Support straps should be 1-1/2 inches wide or more

Maybe someone that is a HVAC contractor can elaborate.