Defrost vent duct solution

I am in the process of replacing my CMC defroster vents with the curved aluminum ones. I probably won't do more until next winter.

I purchased these vacuum cleaner nozzles from amazon.

https://www.amazon.com/Hardwoo...ols%2C187&sr=1-1

Unfortunately, the depression in the middle was an issue. I cut it out and patched the holes with some fiberglass stuff that hardened under UV light. I cut sticky pieces and stuck them over the openings.  Then I put them outside for a while to harden.

I am going to use 1 1/4" vacuum cleaner hose.  I plan to use 1 1/4" helmet fans in the hose to boost airflow. The fans are a bit noisy.

The photos show how far I have gotten on the project.  I have yet to learn if the nozzles will clear the gauges and other stuff under the dash.

Another interesting complication is that I have Tenax fasteners for my tonneau where the slots will be.  I plan to reinstall them through the slots where you can see the little black marks.

I am undecided about whether to paint the aluminum pieces. It seems like most replicas leave them unfinished while most original Speedsters have them painted to match the dash covering.

Mike   My simple method is to butt the aluminum defroster vents against the windshield base rubber as this clears the Tenex fasteners. I also use the smaller auto upholstery nozzles,  glue them to the underside of the dash with Seam Sealer & use duct tape to keep them in place until the seamer has dried.     https://www.ebay.com/itm/20355...7Ctkp%3ABFBM8pOgwbVg   

I wanted to enclose the whole aluminum piece.

I used similar small shop-vac nozzles that I go at True Value or Ace. I think the pipe size is 1.25" and I got some hose from an online vendor designed for cars/airplanes.

I drilled down from on top the dash and used two countersunk screws to hold the vac pieces. Vac pieces had stick-on foam tape to seal under the dash. Then I used touch-up paint to hide the screws. Finally installed aluminum trim pieces from Carey Hines at Beck.