Thien Baffle on the fly project #2: day 2

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Blog entry by Holbs posted 02-24-2014 05:43 AM 1043 reads 0 times favorited 3 comments Add to Favorites Watch
« Part 1: day 1 Part 2 of Thien Baffle on the fly project series Part 3: day 3 »

I decided to change the height of my Thien Baffle to 16”. Why? Because the HVAC hoods I have seen so far have a rapid structure change from circular to rectangle, I have a 3HP dust collector (which is unknown if a Thien Baffle can even handle a 3HP), and when you step on a 6” spiral duct you can come to 8” high and 4.5” wide oval which should be good enough. 8” x 2 = 16”.
While at the Home Depot, I bought hardboard, and 1/2” pipe insulation. I am unsure if using the pipe insulation will function correctly, but heck… for 97 cent worth a shot. I also built the support structure. This week, I’ll be getting the 1/16” lexan and ordering the 7” bellmouth (for my 7” chimney inlet to the DC).

3 comments so far

View Holbs's profile


891 posts in 1068 days

#1 posted 02-26-2014 02:37 AM

I made a fatal engineering flaw. wonder who can spot it.
had to re-do the baffle plate and 1/8” hardboard. have learned, to cut MDF outside. went as far as i could til sun went down. 95% completed with the redo.

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457 posts in 656 days

#2 posted 02-28-2014 01:16 AM

Maybe you hid the fact that you cut too far around by placing that hardboard on there. Your 120 to 240 degree openings appear to be OK. Looks like nice workmanship.

View Holbs's profile


891 posts in 1068 days

#3 posted 02-28-2014 01:21 AM

the start of the opening is too close to the inlet.. the end of the cut is too close to the inlet. I had it backwards :) It’s only nice workmanship because of the Microfence device i’m using. A VERY sweet jig to have. Will be doing a review on LJ’s about it when all done and cleaned up.

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