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Old 10-11-2012, 06:21 PM
brung99's Avatar
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Default Does an angled FLUE make a difference ??

Hi All,

Im installing a modular oven in a corner position under a hip roof. As a result, it is sitting directly underneath the hip rafters. Therefore, i have to place a couple of 45 degree bends in the flue in order to bypass these rafter beams. My question is, is does having an angled/bent flue affect it's performance to any extent that i will notice? Will it make a difference to the way i cook ?

Hoping to hear from anybody who has any experience and can advise.

Thanks.
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  #2  
Old 10-11-2012, 06:47 PM
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Default Re: Does an angled FLUE make a difference ??

Once the flue and oven get to temp I doubt you would notice any difference. You may need to bring it up slower than most (big maybe here). After that it will not be a problem.
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Old 10-11-2012, 07:18 PM
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Default Re: Does an angled FLUE make a difference ??

It sounds like you are venting out through a roof. That leads me to believe your flue is going to be fairly tall, much taller then the couple of feet common on ovens that are built free standing. If that is the case your vent will probably draw better then most ovens, even with the offset.
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Old 10-11-2012, 08:38 PM
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Default Re: Does an angled FLUE make a difference ??

Yep, it will be made up of 3 x 900mm stainless steel tubes, with the angled piece that joins the two straight lengths cut a bit shorter. All up, it will be over 2 metres extending through the roof (BTW, the piece within the roof area and extending out will be contained in an extra double walled "drop box" for safety).

Great to hear that this shouldn't be a problem. Thanks for your input fellas.
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Old 10-11-2012, 08:51 PM
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Default Re: Does an angled FLUE make a difference ??

Actually, 30 degrees is the maximum allowed by code. If possible increase the size of the flue if you have to have an angled exhaust, and minimize the angle as much as possible. The issue is not draw as much as it is flue fires which are notorious for burning down structures.
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Old 10-12-2012, 07:16 PM
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Default Re: Does an angled FLUE make a difference ??

Quote:
Originally Posted by Tscarborough View Post
Actually, 30 degrees is the maximum allowed by code.
Hi Tscarborough,

I live in Sydney and have checked all relevant documentation/regulations and it seems that a 45 degree bend in the flue to pass through walls or around other structures is permissible.

Anyway, I went back outside today and have replanned the positioning of the oven. I'm moving it over about half a meter so that the flue can go straight between the rafters without obstruction. Although I had hoped for it to be sitting symmetrical in that space, I'd rather have a straight flue for draw & safety issues, and not to mention a better look, than for it to be sitting perfectly in the corner with a horrible looking bent flue.

Thanks again for everyones advise.

BTW, I'll post some progress photo's shortly.

Regards,
Bruno
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Old 10-12-2012, 09:26 PM
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Default Re: Does an angled FLUE make a difference ??

We all like hot photos. And pictures of ovens are good too.

Chip
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  #8  
Old 10-12-2012, 09:42 PM
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Default Re: Does an angled FLUE make a difference ??

It may well be in Australia, I only reference IBC and US codes. Even then there is latitude, but best practice is 30 degrees.
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Old 10-12-2012, 10:41 PM
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Default Re: Does an angled FLUE make a difference ??

Quote:
Originally Posted by mrchipster View Post
We all like hot photos.
Just for you Chip a hot pic, the inside of my gas forge, temperature of around 1600c.

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Old 10-13-2012, 01:35 AM
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Default Re: Does an angled FLUE make a difference ??

Hi Al,

What do you forge? Crocodile Dundee knives? If so I want one.
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