Silver vs Black flex duct


Old 09-16-06, 12:10 PM
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Silver vs Black flex duct

What is the difference between silver and black flex duct. Both seem to come in 4.2 and 6R (at big box store). Are they interchangable? Can you use both on the same HVAC unit or should you use the same throughout the system?
Old 09-16-06, 09:34 PM
airman.1994's Avatar
Join Date: Dec 2005
Location: VA
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never got any from Box store! But get flex all the time from sheet metal store in my area VA foil (silver) is the way to go. It is stronger. Don't know if same every where else.
Old 09-16-06, 09:40 PM
Ed Imeduc's Avatar
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Location: Mountain Williams Missouri
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The R are the same . But I think the silver seems to hold up better in the attic. I think its from the high heat there .----- from the outside not from the inside of it. In a crawl space dont matter both hold up the same . also on some silver they have like a tie in or hanger rings on it to run wire to it to hold it up. You can mix it up anyway you want silver or black. Use the same ties and mastic duct sealants

ED my .02 cents

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