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Old 03-30-2009, 12:32 PM   #1
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Running Flexible Beside Metal


Hello!

Is it OK to run a flexible duct along side a metal duct? I'm installing a heat/light/vent unit in a basement bathroom and just want to make sure that I'm not creating a potential fire hazard if the ducts were to be touching each other. I don't think so...but just want to clear the question out of my mind!

Thanks for your help!

Mark


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Old 03-30-2009, 01:07 PM   #2
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Running Flexible Beside Metal


no problem Ducts do not get that hot.

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Old 03-30-2009, 07:36 PM   #3
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Running Flexible Beside Metal


Thanks Bob! I was just concerned that the heat from the metal duct (at least during winter) might cause some problems with the flexible duct.

Mark
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Old 03-30-2009, 11:24 PM   #4
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Running Flexible Beside Metal


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Old 03-31-2009, 08:00 AM   #5
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Running Flexible Beside Metal


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LOL! Well, my concern is...if the metal duct gets hot from the air when the furnace is on...would there be any heat transfer/fire issues if there is a flexible duct laying right on top of and/or touching the metal duct?

Mark
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Old 03-31-2009, 11:14 AM   #6
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Running Flexible Beside Metal


Your furnace discharge air temp shouldn't be high enough to start a piece of paper on fire(roughly 460F).
Let alone transfer enough heat to another pipe to start a fire else where.
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Old 03-31-2009, 12:23 PM   #7
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Running Flexible Beside Metal


Are you thinking of using those plastic flexible ducts?

If this is a duct for the bath exhaust go with a smooth rigid metal duct. Also, slope it towards the outside in case you get condensation building up inside it...another reason to avoid flex duct with ridges. You can also insulate it. Just my preference.
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Old 04-02-2009, 07:49 PM   #8
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Are you thinking of using those plastic flexible ducts?
Nope...it's aluminum. This is for a basement bathroom that will get more sink & potty use than shower use.

Thanks for the assistance everyone!
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Old 04-03-2009, 09:51 AM   #9
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Running Flexible Beside Metal


A nice extra is a timer switch. Smell will linger in the room after you leave, so it's nice to have the fan running an extra 5 minutes or so after to clear out the odor.

Of course it's not necessary if you can remember to come back later and turn off the fan.
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Old 04-03-2009, 09:59 AM   #10
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Originally Posted by Mazz View Post
A nice extra is a timer switch. Smell will linger in the room after you leave, so it's nice to have the fan running an extra 5 minutes or so after to clear out the odor.

Of course it's not necessary if you can remember to come back later and turn off the fan.
Moisture too, since this is what the fan is designed for. Now it CT we are required by code to use a timed switch for the fan and it needs to be tied to the light so it will always get used.
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Old 04-03-2009, 10:05 AM   #11
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Is that for commercial? Seems strict for residential.
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Old 04-03-2009, 10:14 AM   #12
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Running Flexible Beside Metal


for residential. Want to be assure to limit mold Cold here and one does not open the window to ventilate a bath during the winter.

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