Furnace duct fittings?

[tom-ky]

It sure what it is called but need the piece that attaches to the furnace to attach to duct work. Was give a nice Carrier unit and going to try to use it in the garage temporarily at least. Furnace has a 16" x 11" opening that I wanted to adapt to a round duct. Someone told me they just put an elbow on a furnace and let it blow into garage. I actually thought about a couple drops. Would like to find something already made up. Any suggestions?

 

[kd3pc]

sheet metal shop...very little is available elsewhere "made up"....

call around and see what they can build up for you. If you have a tech school around with an HVAC/R class, they may take you on as a project.

 

[firebirdparts]

It seems strange, but I agree I have never seen one. You'll just have to make something.

 

[maintguy]

square to round fitting

several ways to do this

 

[maintguy]

you thinking something like this?

 

[tom-ky]

you thinking something like this?

Yes. What do you call it? Wonder if there is somewhere I can order online? Nothing in our small town.

 

[ToecuttersZ1R]

Its called a plenum.
I would look for a prefab one or get one made to fit the furnace. Then put a round collar on the top to connect to the round ductwork.

 

[ToecuttersZ1R]

Yes. What do you call it? Wonder if there is somewhere I can order online? Nothing in our small town.

Try to find an HVAC company that could make it for you.

 

[zmaxmotorsports]

Or you could just zip screw a square piece of tin over existing hole,then cut a tap collar into it to attach your round pipe to till you decide what you want to do permanently.

 

[BillK]

Tom,
You might want to ask a local HVAC installler. I think if you just put that reducing plenum right on top of the furnace it will probably restrict the air flow enough to cause the furnace to go into an overheat shutdown. You would probably be better off having a rectangular duct made up to go up and along the ceiling with several outlets from it.

 

[tom-ky]

Tom,
You might want to ask a local HVAC installler. I think if you just put that reducing plenum right on top of the furnace it will probably restrict the air flow enough to cause the furnace to go into an overheat shutdown. You would probably be better off having a rectangular duct made up to go up and along the ceiling with several outlets from it.

Really don't want an elaborate duct system as it will probably only be used for short term. Would not mind some short length with maybe a couple outlets. will have to see if I can get any ideas from any one.

 

[LS6 Tommy]

Normally it's called a "square to round transition". In your case it would be a "square to round transition plenum", and unless you just leave the end open as previously mentioned, it may restrict flow.

Tommy

 

[tom-ky]

Normally it's called a "square to round transition". In your case it would be a "square to round transition plenum", and unless you just leave the end open as previously mentioned, it may restrict flow.

Tommy

Would like to have something that would just direct the air flow toward the center of the building. Kind of a big snorkel.

 

[mrobins297aaa]

I would try a local HVAC supply house. They usually sell pre-made plenums that fit on top of the furnaces that they sell. If they happen to have that size you could buy that and a cap for the top.
You could also pick up some round collars and pipe and cut them into the plenum. (A plenum is just a piece of rectangular duct work that sits atop the furnace)

 

[johnnyradiant]

If you want a couple simple ducts would you consider 3 I'd be temped to get your plenum made up with 2 or 3 round outlets that equal or exceed the area of 11X16=176 sq" then you don't have to worry about restrictions. The more you restrict the more noise you will get moving that air around. 2 11" dia would work but maybe you could do 3 - 2X 10" & 1 6".

 

[peter2772000]

On a forward-curved blower wheel, no plenum will likely cause your motor to over-amp. You "should" always have at minimum a plenum, even if there's only one big-*** grille at the end.

In my garage, I have exactly the above. 3' section of plenum terminating with one +/- 20" x 24" double-deflection grille, allowing me to adjust the direction of the air-flow.

 

[tom-ky]

On a forward-curved blower wheel, no plenum will likely cause your motor to over-amp. You "should" always have at minimum a plenum, even if there's only one big-*** grille at the end.

In my garage, I have exactly the above. 3' section of plenum terminating with one +/- 20" x 24" double-deflection grille, allowing me to adjust the direction of the air-flow.

Would you have a picture of that? Sounds like what I would like to do.

 

[peter2772000]

https://photos.google.com/share/AF1...?key=WlZSQ0kzbS16WHN3eTFmdDZmSllKend1OE9aWmRn


I was "slightly" off on my guess of the grille size LOL. 14" x 22" is the real size. Furnace is a nat gas converted to propane, 60k btu output, high-eff.

 

[LS6 Tommy]

Would like to have something that would just direct the air flow toward the center of the building. Kind of a big snorkel.

I figured that's what you were looking for. I've seen that a bunch of times. I don't see a big problem with that. As long as you develop a little static pressure, you won't over load the motor.

Tommy

 

[tom-ky]

On a forward-curved blower wheel, no plenum will likely cause your motor to over-amp. You "should" always have at minimum a plenum, even if there's only one big-*** grille at the end.

In my garage, I have exactly the above. 3' section of plenum terminating with one +/- 20" x 24" double-deflection grille, allowing me to adjust the direction of the air-flow.

I wanted to test this furnace before going to the trouble to mount it. So if I have nothing right now and try to run it to make sure it works will it over amp?

Is there a way to test it to make sure everything is ok. I was wondering if it might get too much air flow over the elements causing a problem.

 

[Tracs]

I wanted to test this furnace before going to the trouble to mount it. So if I have nothing right now and try to run it to make sure it works will it over amp?

Is there a way to test it to make sure everything is ok. I was wondering if it might get too much air flow over the elements causing a problem.

You will be fine. Wire it up and turn it on. Nothing is going to happen. I install furnaces/duct work and lots of time we have a electric furnace with ZERO duct work, no return or plenum, wired up sitting on the ground blowing hot air to heat the work space.

 

[tom-ky]

You will be fine. Wire it up and turn it on. Nothing is going to happen. I install furnaces/duct work and lots of time we have a electric furnace with ZERO duct work, no return or plenum, wired up sitting on the ground blowing hot air to heat the work space.

I tried it since I posted this and it is tripping the 60 amp breaker on it. Any suggestions?

 

[Crazyjake8493]

For the duct issue, a plenum ell made to fit the furnace would be a good, easy solution, like this

 

[peter2772000]

I tried it since I posted this and it is tripping the 60 amp breaker on it. Any suggestions?

If it's tripping a 60A breaker, it's not due to the fan motor over-amping. And though I don't agree with no static pressure not causing an issue, fact is that the only way you'll know for sure is with a simple clamp-on ammeter.

How many kilowatts is your heater? I hope not more than 10-12?

 

[tom-ky]

If it's tripping a 60A breaker, it's not due to the fan motor over-amping. And though I don't agree with no static pressure not causing an issue, fact is that the only way you'll know for sure is with a simple clamp-on ammeter.

How many kilowatts is your heater? I hope not more than 10-12?

It is a Carrier 10kw. Where do I need to check current draw at?