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Old 01-18-2013, 06:26 PM   #16
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Enclosed HVAC room ventilation


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Originally Posted by HVAC1000 View Post
That is all true but my main concern is always safety rather than cost. And why does it hurt to spend a small amount of to ensure his families safety and peace of mind. It's true that you don't need to bring air if your house is old and leaky or your windows are not sealed properly. The furnace is currently pulling its combustion air from an unfinished basement which is a very large space to pull air from. Once you close it off in a smaller room. Even with louvered doors the unit is still pulling from a much smaller place. With the air intakes you are pulling air from outside. And the outside is a very large space. Considering everything said I am just telling my view on it all and what I would do from my years ( yes less than 10) of experience.
JScotty I respect you for all that you have said and defending your side of this. And you have given me a lot to think about and consider. I can see you have a lot of experience and truly know what you are talking about.
This whole situation is up to the homeowner all we can do is give advice and how we would do it in our customers houses
Don't get me wrong I'm not saying it's a bad idea to use outside air for combustion. It's just that in my experience it doesn't make a difference. I definately wouldn't go as far as to say it WILL cause carbon monoxide to leak back into your house. I don't think an inducer motor pulls enough pressure to fight the natural draft of a water heater. IMO if it was really something that causes CO to leak into a house it would be against code everywhere.

Like I said I just know I've never seen vents outside, but I've seen a lot of furnaces using indoor air for cumbustion & never had a complaint about carbon monoxide because of it. I do appreciate your experience as well, just sharing what I've noticed, not anything personal to you at all

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Old 01-19-2013, 10:05 AM   #17
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Don't get me wrong I'm not saying it's a bad idea to use outside air for combustion. It's just that in my experience it doesn't make a difference. I definately wouldn't go as far as to say it WILL cause carbon monoxide to leak back into your house. I don't think an inducer motor pulls enough pressure to fight the natural draft of a water heater. IMO if it was really something that causes CO to leak into a house it would be against code everywhere.

Like I said I just know I've never seen vents outside, but I've seen a lot of furnaces using indoor air for cumbustion & never had a complaint about carbon monoxide because of it. I do appreciate your experience as well, just sharing what I've noticed, not anything personal to you at all
Ya I guess you are right that saying it WILL was a bit much. It's just that around here the inspectors seem to make a really big deal about it. I think they just try to put any and all liability on the contractors so that's how they make sure.
And thank you JScotty
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Old 01-19-2013, 11:53 AM   #18
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Enclosed HVAC room ventilation


Ok. I want to put in my 2 cents here. I don't have the HVAC experience that a full time service guy/gal has but I do my share in the property management and rehab side of the business. I live in the midatlantic states and you just don't see vents to the outside in basements for combustion air unless it is a designed powervent system. I manage 40 properties and work in another 50 and they ALL pull air from inside unless it is a powervent system. Putting a room around systems in basements is something I have done dozens of times and I address the combustion air issue by making the room big enough to work in, putting in air vents at the top and bottom of each wall and using louvre doors on the room. We also put lourve doors on the basement door. So where are you pulling combustion air?? You pull it from the whole house! That being said, all of my properties have wired smoke detectors and we put CO detectors in the basement and on each sleeping floor (in our state CO detectors are required on sleeping floors but not in the basement). It is absolutely true that houses are tighter than they used to be, but I haven't seen one yet that doesn't have enough air pull to allow for a safe install, and have never had a detector go off after a basement redesign. So Troyce1 that is my take on it, from someone that has done what you are doing numerous times.
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Old 01-19-2013, 01:20 PM   #19
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Enclosed HVAC room ventilation


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I plan on enclosing my furnace and gas water heater in a 10x10 foot room in our basement to conceal them. I was researching ventilation needed for the room, and found that a high and low vent should be installed with the size depending on the BTU's.

However, from what I found louvered doors are not recommended? Can someone please explain. Louvered doors seem like they would be larger than a vent, and satisfy both the high and low ventilation requirements.

Any info on this would be appreciated.

Thanks
Louvered doors will work fine.

However, now is the time to decide if you want to lower your heating bill or not. If you want to lower it. Then use outside air for combustion. That will reduce the amount of cold dry air you bring into your home. And help keep your humidity up a little.
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Old 01-19-2013, 09:57 PM   #20
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well what they do in modern houses is they build them super tight, put in high efficiency furnace and water heater so they both get piped in and piped out. then to make up for the high humidity in the house they install what is called ventilation air which is brought in from the outside piped into an air to air heat exchanger that heats it to near room temperature then it is piped into the return air plenum before the filter. then they also pipe out some of the humid air to make up for the air being pulled in. its an odd way to do in "build the house so nothing can get in then bring in some outside air so it doesnt start raining in here".
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Old 01-20-2013, 12:19 AM   #21
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i can completely understand how the louvered doors will allow for enough combustion air. its just that where i come from we are required to the fullest to bring in combustion air from the outside so not having it seems extremely foreign to me. i understand now that our codes are just overly strict. i apologize for being stubborn about the way we do things.
Thank you beenthere i am glad that my opinion still had some importance haha
so have we heard anymore from the original poster of this thread. i thought they were going to post pictures of the situation

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