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Suggestions for a log run kitchen exhaust

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Suggestions for a log run kitchen exhaust Mike Hartigan 02-24-2008
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Posted by Mike Hartigan on February 24, 2008, 8:48 pm
I'm finishing up my basement bar that includes a range with a grill.
These beasts tend to generate some smoke, so a vented exhaust is a
must. I've got a nice, beefy blower, but I'm concerned that the 20'
duct that will be installed above the suspended ceiling will leak
smoke and/or grease, particularly since the blower will be installed
at the hood, meaning that there will be positive pressure along the
entire length of the duct. How can I minimize this? 4" PVC would be
nice, but I suspect that it wouldn't be well suited to this
application (and probably not code). What are my options?

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Posted by DanG on February 24, 2008, 9:06 pm
Don't let a code authority or an insurance man know what you are
doing. That run of duct will need to be welded steel with fire
suppression. No joints allowed. It should technically be a
grease hood with Halon, but they may reluctantly allow adapting a
conventional hood with a remote Ansul valve. As far as I know,
you will need to install an exterior grease fan, not a push type.

Ain't code compliance wonderful?

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net



> I'm finishing up my basement bar that includes a range with a
> grill.
> These beasts tend to generate some smoke, so a vented exhaust is
> a
> must. I've got a nice, beefy blower, but I'm concerned that the
> 20'
> duct that will be installed above the suspended ceiling will
> leak
> smoke and/or grease, particularly since the blower will be
> installed
> at the hood, meaning that there will be positive pressure along
> the
> entire length of the duct. How can I minimize this? 4" PVC
> would be
> nice, but I suspect that it wouldn't be well suited to this
> application (and probably not code). What are my options?



Posted by AZ Nomad on February 25, 2008, 7:47 am
>Don't let a code authority or an insurance man know what you are
>doing. That run of duct will need to be welded steel with fire
>suppression. No joints allowed. It should technically be a
>grease hood with Halon, but they may reluctantly allow adapting a
>conventional hood with a remote Ansul valve. As far as I know,
>you will need to install an exterior grease fan, not a push type.

>Ain't code compliance wonderful?

Those sound the requirements for a restaurant. Aren't the requirements in a
household going to be less stringent? Most home owners don't cook for a
thousand people every single night.

Posted by JoeSpareBedroom on February 25, 2008, 8:09 am
>>Don't let a code authority or an insurance man know what you are
>>doing. That run of duct will need to be welded steel with fire
>>suppression. No joints allowed. It should technically be a
>>grease hood with Halon, but they may reluctantly allow adapting a
>>conventional hood with a remote Ansul valve. As far as I know,
>>you will need to install an exterior grease fan, not a push type.
>
>>Ain't code compliance wonderful?
>
> Those sound the requirements for a restaurant. Aren't the requirements in
> a
> household going to be less stringent? Most home owners don't cook for a
> thousand people every single night.


Why should the science of fire prevention be any different at home than at a
restaurant? Maybe the ducts in a restaurant reach the danger level in a
month, and at home, two years, but at that magical moment, there's enough
grease in the pipes to make life interesting. The length of time to the
MOMENT is the variable.



Posted by Mike on February 25, 2008, 8:20 am
>
>
> >>Don't let a code authority or an insurance man know what you are
> >>doing. That run of duct will need to be welded steel with fire
> >>suppression. No joints allowed. It should technically be a
> >>grease hood with Halon, but they may reluctantly allow adapting a
> >>conventional hood with a remote Ansul valve. As far as I know,
> >>you will need to install an exterior grease fan, not a push type.
>
> >>Ain't code compliance wonderful?
>
> > Those sound the requirements for a restaurant. Aren't the requirements in
> > a
> > household going to be less stringent? Most home owners don't cook for a
> > thousand people every single night.
>
> Why should the science of fire prevention be any different at home than at a
> restaurant? Maybe the ducts in a restaurant reach the danger level in a
> month, and at home, two years, but at that magical moment, there's enough
> grease in the pipes to make life interesting. The length of time to the
> MOMENT is the variable.

Surely, the requirements are different for a home. For example, how
many combination microwave/exhaust hoods do you see in a restaurant
equipment catalog? And, last I checked, none of the $150 GE
microwaves at Best Buy included provisions for Halon. My restaurant
experience leads me to suspect that a month's worth of buildup in a
restaurant's ducts is more like a century's worth of buildup in a
residential kitchen. Your point, while certainly valid, is a bit of a
stretch.

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