Sealing a fabric duct
Sealing a fabric duct
(OP)
I am testing a 150'long 4" dia fabric duct carrying air which enters the duct at ~ 5 psi. Due to the seam along the hose and the losses between duct connections (one every 50 ft) I am losing an incredible amount of pressure and airflow.
I have recently ordered some "Vyna Bond" to seal the seam on the duct. I will try and tape the hose connections as well.
Has anyone had experience sealing a seam? Any other suggestions on how to seal the duct? Any long term suggestions on fabricating a duct which is lightweight and flexible (preferably fabric) yet well sealed?
Thanks in advance.
I have recently ordered some "Vyna Bond" to seal the seam on the duct. I will try and tape the hose connections as well.
Has anyone had experience sealing a seam? Any other suggestions on how to seal the duct? Any long term suggestions on fabricating a duct which is lightweight and flexible (preferably fabric) yet well sealed?
Thanks in advance.





RE: Sealing a fabric duct
Is pressure really 5 psi? or is it 5 inches w.c.? 5 psi is way past the rated pressure of any of the fabric ducts I am familiar with for HVAC purposes.
RE: Sealing a fabric duct
Thanks.
RE: Sealing a fabric duct
RE: Sealing a fabric duct
RE: Sealing a fabric duct
Compositepro -- I agree that the seam will be a portion of the problem. I guess the Vyna Bond will help me seal off the seam so I can go to the next major problem (Good thing I bought 5 gallons right?).
To be honest I don't know if it is coated or not. Similar ducts are PVC coated. This particular duct has a layer or two of insulation between the air and the outer duct layer.
RE: Sealing a fabric duct
Or is this what you are building?
B.E.
RE: Sealing a fabric duct
I may be asking for too much -- Regardless, it has been helpful to hear other's ideas.
Thanks!