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Old 01-10-2009, 10:52 AM   #1
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Is this legal?


I am finishing my basement. Right now I am running the ductwork. This is going to be the bedroom. I am wondering if I can just run one of those saddle vent boxes off of this existing duct. The existing one goes up into the room above it which is seldom used and I usually have the vents closed anyways. Each room will have their own dedicated duct straight off the main one. But they will each share this duct. I understand that each room will get a little less heat if I leave both vents open, but the basement stays at a pretty comfortable temperature no matter what and the room above it is just an office that heats itself pretty well from sunlight even without the heat on. Is it OK to do this?

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Old 01-10-2009, 10:58 AM   #2
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It is not dangerous or illegal. Go for it. Make sure you use a ceiling diffuser with a round screw in type of closable vent so you can shut it for summer/air cond use.

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Old 01-10-2009, 11:25 AM   #3
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Alright I was just planning on running the duct for this room and I realized there isn't enough room through the trusses unless I move some major pipes, and other stuff that I don't even want to get into. Since that room above this picture has two dedicated ducts to it, would it be OK to just saddle off of both of them? That way there would only be 2 ducts supplying air to both rooms out of four total vents.
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Old 01-10-2009, 11:27 AM   #4
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You are gonna cut down on the air flow by piggy backing ducts meant to serve one room only. Might not be matter in heat but if you are adding additional branches to a trunk that was designed for the rooms of the living areas you may get yourself into some problems on the cooling side.

In other words when you moved in you have a duct system designed to serve all the rooms in your sleeping area, kitchen, living room ect.

if i read your post right you want to add additional branch runs to the basement.

Now you are over extending the existing duct work parameters.

You'll have more duct volume to fill then the blower is capable of delivering.

You will get lower airflow in your living areas with what you propose.
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Old 01-10-2009, 11:49 AM   #5
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That is why I prefer to use electric baseboard heaters in basement rooms/development. A heck of a lot less hassle/gives you heat individually and control over it. On a sunny day the furnace may not run too much and the basement will still be cold.
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Old 01-10-2009, 01:10 PM   #6
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Is this legal?


Saddle tapping them will lead to other problems.

If that office needs A/C, it won't get as much now.

Cold air will fall from the office, through that duct, into that basement bedroom.

That room should have its own dedicated supply and return, if you really want to heat it with your existing furnace.

Baseboard would be mucg easier, and work better with less aggrevation.
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Old 01-10-2009, 01:33 PM   #7
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Cold air will fall from the office, through that duct, into that basement bedroom.


I thought there was something I forgot..... Thanks Been

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