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Alumaflex Wrapped Duct specs and questions

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3.5K views 7 replies 3 participants last post by  randomHVAC  
R
#1 ·
Hello,

I am looking to get ducts replaced in a narrow crawlspace. Original ducts are 1996, flex duct with the pink insulation and plastic wrap inside and out (black on outside, clear on inside). They are nasty and got infested by rodents. The house is in very very rural California mountains.

I would like to install rigid ducts, however a few areas are difficult for this and Alumaflex was mentioned.

Does anyone have experience with "Alumaflex" wrapped ducts? I can't seem to find a supplier that will sell me 1 piece and I can't seem to find a spec sheet. Can I just assume it's the exact same as the aluminum dryer vent duct at Home Depot just wrapped with insulation and foil on the outside? Does the installer need to stretch the duct tight?

I would assume I would need to tell future plumbers and electricians if they are ever down there, to NOT push up on the duct and crimp it, correct?

This will not be a DIY job. I just like to learn about what is going into my house to weight the pros/cons of $X dollars vs $Y dollars.
 
R
#2 ·
I tried to post a link to AC Pro that has this.

Manufacturer is "Universal" and I can't find any company that has the brand "Alumaflex" as something they claim is their product. I'm trying to figure out who makes this.
 
R
#4 ·
The above Alumaflex. I am just surprised I cannot find a single ounce of detail about it. Only 1 YouTube video of a guy building his own version of the above. Is it a good product? Pros/cons vs rigid?.
 
R
#6 ·
I get that and have asked. It's also my house and my money, I'm going to do my own due diligence, always have, always will. Nothing wrong with me wanting to know more from other parties. WTF. Not all contractors or installers are created equal.
 
J
#7 ·
I’ve never seen or installed alumiflex, looks like aluminum dryer vent with insulation wrapped around it. It is also probably expensive relative to rigid pipe.

I would run KD pipe if that’s what you requested. Screwed together with mastic air seal and wrapped with R8 duct wrap.
 
R
#8 ·
Thanks, contractor is quoting both ways (KD and Alumaflex). I did find this product sheet from a company called Flexmaster USA. They have R6 insulation already installed, so not sure if that saves money on the labor of doing KD on site.

https://www.flexmasterusa.com/Portals/2/Downloads/Triple Lock/TLM.pdf

The Flexmaster U.S.A.® Triple Lock Aluminum ducting is an all metal flexible duct that is constructed entirely without the use of adhesives. The Triple Lock mechanical joint makes an air tight seam, while the circumferential corrugations provide excellent strength and flexibility. Minimum bend radius to center line is one diameter. However, our recommended radius is 1 1⁄2 diameters in accordance with accepted practice. Triple Lock Aluminum ducting may be easily cut to size and hand formed into elbows or offsets to suit job conditions without subsequent sagging or droop. Triple Lock has much lower pressure loss than conventional cloth ducts due to the small but consistent corrugations that provide both strength and flexibility.
 
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