Using a wind directional cap on stack

Surf bum · Post by **Surf bum** » December 10th, 2016, 7:43 pm

In an area where you get a constant wind vortex due to roofline, would this help to prevent occasional backdrafting ?

Post by **Big T** » December 10th, 2016, 10:08 pm

It would probably help. I remember a guy built a contraption on his stack to stop back drafting but I don't remember what thread it was on.

Post by **Rodcrafter** » December 10th, 2016, 10:38 pm

I remember that but like BT I don't recall the thread. Yes I agree it should help

Making memories!

Surf bum · Post by **Surf bum** » December 11th, 2016, 10:33 am

Thanks guys for the reply. Only have this problem in the winter months when the wind changes to the nnw from the ssw. Searched site but couldn't find thread info either. Have a Happy Holiday.

The Czar · Post by **The Czar** » December 11th, 2016, 2:08 pm

Depending on the size and length of your stack....I know on a drum or short stack we usually take a charcoal chimney and turn it upside down over the stack and that seems to help...

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Post by **Tom_Heath** » December 11th, 2016, 9:50 pm

It even works On a tall stack. But ya that.

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Gizmo · Post by **Gizmo** » December 12th, 2016, 7:41 am

Edgar had a stack plate because I always used him in front of the house just below the roofline and the down draft/back draft was a real problem.
You should be able to fashion something with scrap metal and clamps to see if it works first but it's super simple. A piece of sheet metal about twice the area of the stack opening - then hold it above the end of the stack about half the diameter of the stack. I'm assuming you have a straight cut end on your stack. It provides just enough deflection to prevent the backdraft pressure but it can still breathe....

Post by **Rodcrafter** » December 12th, 2016, 2:53 pm

I sure have missed you Gizmo

Making memories!

Gizmo · Post by **Gizmo** » December 12th, 2016, 8:37 pm

gosh ....

The Czar · Post by **The Czar** » December 12th, 2016, 9:45 pm

RC....your just glad he's back so you don't have to answer any more questions!!

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Post by **Rodcrafter** » December 12th, 2016, 10:21 pm

You know too much about me DC!

Making memories!

Squiggle · Post by **Squiggle** » December 13th, 2016, 1:39 am

Surf bum · Post by **Surf bum** » December 16th, 2016, 5:33 pm

Busy, fabbed a mock up of a 3" directional cap with maybe a shark fin design vane out of scrap Mylar at work. Can't find an order 3" cap and can get a 4" stock cap and use a 3"×4" smoke increaser- but dont know if that would create more draft? Any thoughts? No problem building the 3", plan on using all anodized blue round head rivets for effect. But-if it increases draft with the 4" I could get it next week and drill and fill with blue rivets. Finished up an air inlet handle today with some scraped flight control parts and a seat adjuster handle from a ch-47. Getting tired of squatting. Happy Holidays to all.

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Using a wind directional cap on stack

Using a wind directional cap on stack

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Re: Using a wind directional cap on stack

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Re: Using a wind directional cap on stack

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Re: Using a wind directional cap on stack