reduce range hood vent size or elbow it all over the place?

Posted by fourempties on August 18, 2006, 3:49 pm

I have a high performance range hood that I need to vent up and then
sideways about 10 feet to the outside. The manufacturer requires a 7"
round duct. In order to use a 7" duct I'll have to vent it up, put in a
90, run it across the top of my cabinets, put in a 45 to get in front
of a joist, then another 45 to get back straight, then a 90 up, and
then a 90 to go to the outside. If I reduce it to a 4" duct, I can go
up, put in a 90 and go straight to the outside.

So, which is the lesser of the 2 evils? Any help would be very much
appreciated.

Posted by Bubba on August 18, 2006, 5:28 pm

wrote:

>I have a high performance range hood that I need to vent up and then
>sideways about 10 feet to the outside. The manufacturer requires a 7"
>round duct. In order to use a 7" duct I'll have to vent it up, put in a
>90, run it across the top of my cabinets, put in a 45 to get in front
>of a joist, then another 45 to get back straight, then a 90 up, and
>then a 90 to go to the outside. If I reduce it to a 4" duct, I can go
>up, put in a 90 and go straight to the outside.
>So, which is the lesser of the 2 evils? Any help would be very much
>appreciated.

If the manufacturer requires a 7" vent but a 4" will work much easier
then by all means, reduce the vent size by almost 50%. It wont hurt a
thing. The manufacturers usually take things to the extreme and allow
for a lot of fudge factor. I would reduce it to 3" but NO smaller. 3"
pipe is cheaper and will do the same job as the 4". You should be all
set to go.
Bubba

Posted by fourempties on August 18, 2006, 7:35 pm

OK- thanks for your help. I may have to cut some of the duct pipe short
and blow it through the baby's nusery for about 2 or 3 feet, but I can
set up a fan to direct the air back into the ductwork before it reaches
the corner where the crib is. I should be able to go back up to a 5"
pipe at that point and just hang a furnace filter from the ceiling to
catch any food debris and grease. You are a real asset to this board.
Thanks for all of your insight.

Bubba wrote:

> wrote:

> >I have a high performance range hood that I need to vent up and then
> >sideways about 10 feet to the outside. The manufacturer requires a 7"
> >round duct. In order to use a 7" duct I'll have to vent it up, put in a
> >90, run it across the top of my cabinets, put in a 45 to get in front
> >of a joist, then another 45 to get back straight, then a 90 up, and
> >then a 90 to go to the outside. If I reduce it to a 4" duct, I can go
> >up, put in a 90 and go straight to the outside.
> >So, which is the lesser of the 2 evils? Any help would be very much
> >appreciated.

> If the manufacturer requires a 7" vent but a 4" will work much easier
> then by all means, reduce the vent size by almost 50%. It wont hurt a
> thing. The manufacturers usually take things to the extreme and allow
> for a lot of fudge factor. I would reduce it to 3" but NO smaller. 3"
> pipe is cheaper and will do the same job as the 4". You should be all
> set to go.
> Bubba

Posted by Steve Scott on August 18, 2006, 7:58 pm

Didn't he just help you figure out what to do?

wrote:

>OK- thanks for your help. I may have to cut some of the duct pipe short
>and blow it through the baby's nusery for about 2 or 3 feet, but I can
>set up a fan to direct the air back into the ductwork before it reaches
>the corner where the crib is. I should be able to go back up to a 5"
>pipe at that point and just hang a furnace filter from the ceiling to
>catch any food debris and grease. You are a real asset to this board.
>Thanks for all of your insight.
>Bubba wrote:

>> wrote:

>> >I have a high performance range hood that I need to vent up and then
>> >sideways about 10 feet to the outside. The manufacturer requires a 7"
>> >round duct. In order to use a 7" duct I'll have to vent it up, put in a
>> >90, run it across the top of my cabinets, put in a 45 to get in front
>> >of a joist, then another 45 to get back straight, then a 90 up, and
>> >then a 90 to go to the outside. If I reduce it to a 4" duct, I can go
>> >up, put in a 90 and go straight to the outside.
>> >So, which is the lesser of the 2 evils? Any help would be very much
>> >appreciated.

>> If the manufacturer requires a 7" vent but a 4" will work much easier
>> then by all means, reduce the vent size by almost 50%. It wont hurt a
>> thing. The manufacturers usually take things to the extreme and allow
>> for a lot of fudge factor. I would reduce it to 3" but NO smaller. 3"
>> pipe is cheaper and will do the same job as the 4". You should be all
>> set to go.
>> Bubba

--
Every morning is the dawn of a new error...

Posted by Murdentech on August 18, 2006, 8:22 pm

> OK- thanks for your help. I may have to cut some of the duct pipe short
> and blow it through the baby's nusery for about 2 or 3 feet, but I can
> set up a fan to direct the air back into the ductwork before it reaches
> the corner where the crib is. I should be able to go back up to a 5"
> pipe at that point and just hang a furnace filter from the ceiling to
> catch any food debris and grease. You are a real asset to this board.
> Thanks for all of your insight.

ROFLMAO... good reply.

> Bubba wrote:

>> wrote:

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