Venting a Nat gas heater

[tch330ci]

Good evening-

I have a 100k btu nat gas heater installed in my 36x60x16 shop. I can't seem to find an exhaust vent pipe that will fit it.

The connection on the heater itself is somewhat of an oval, measuring 5 inches high and 7 inches wide.

I've found Oval to Round adapters online, but none of them say the 5x7 dimension, only 4,5, or 6 inches...

For my venting purposes, I should only need a 5 inch diameter type b pipe, but I can't seem to figure out the oval to round adapter size...

Can anyone elaborate on that for me please?

Thanks!

 

[brewchief]

Most heaters like that with an oval outlet you simply oval out a section of single wall round pipe to fit, just squish it a bit.

The oval to round adapters are going to be around 3.5" on the narrow side in most cases as they will be for warm air pipe to be run in stud walls.

There is oval b-vent made but it's not very common and the dimensions you have don't sound close at all to it.

Try a piece of 6" pipe.

 

[zmaxmotorsports]

 

[tch330ci]

Thanks for the replies.

So can I just run single walled pipe all the way outside?

I'll be venting horizontally about 4 ft to the wall, and another 18 inches outside total to meet spec.

 

[CNGsaves]

Too little information. What specific brand / model of heater??

Let's SEE what your talking about . . . . GJer's really like PICS as they tell a thousand words !

 

[plott hound]

Too little information. What specific brand / model of heater??

Let's SEE what your talking about . . . . GJer's really like PICS as they tell a thousand words !

yupper,what CNG saves said. ^^^^^

 

[tch330ci]

Ask and you shall receive-

 

[theoldwizard1]

So can I just run single walled pipe all the way outside?

I'll be venting horizontally about 4 ft to the wall, ...

Single wall, doubtful. Double wall still get pretty darn hot.

I do know that when even double wall pipe passes through a "combustible" surface (including drywall which really isn't combustible) it must have a collar that spaces it at least 6" away from that surface. The guy who did my water heater got flagged by the inspector because he did not trim the drywall back far enough.

 

[plott hound]

so would a 6" piece of c-vent conform to that oval shape?then a C to B adapter then B-vent to the outside through a wall or roof starter kit.do you have the manual to tell you what size venting to use?or if in fact you can vent that heater horizontally?

 

[nehog]

Why, when I look through the top picture of the vent pipe, do I see the other side of your shop?

 

[CNGsaves]

Still need . . . BRAND . . . . and . . . . MODEL # . . . . specific information.

Looks to me like old standing pilot Modine or Reznor ??
Both of these companies have excellent websites and customer support.

I'd doubt that old style can be horizontal flue. Every install I've seen with those old style heaters, they have vertical flues.

+1 for OldWizard plan for short section/elbow of single/double wall that transitions to double wall, with appropriate separation/protection when going through ceiling. If your AHJ (authority having jurisdiction . . . ie local city inspector) has more stringent flue requirements, then you'll have to follow those rules . . . . even if gawd awful expensive stainless steel (hopefully not). Your goal is to make the local inspector all smiley and happy.

Need MORE PICS like the manufacturers product plate on heater.

 

[plott hound]

ya,that old sumbitch is not power vented.no horizontal venting

 

[Bondo]

Good evening-

I have a 100k btu nat gas heater installed in my 36x60x16 shop. I can't seem to find an exhaust vent pipe that will fit it.

The connection on the heater itself is somewhat of an oval, measuring 5 inches high and 7 inches wide.

I've found Oval to Round adapters online, but none of them say the 5x7 dimension, only 4,5, or 6 inches...

For my venting purposes, I should only need a 5 inch diameter type b pipe, but I can't seem to figure out the oval to round adapter size...

Can anyone elaborate on that for me please?

Thanks!

Ayuh,... I've got a woodstove with that same connection,....

Just gently squeezin' a 6" round pipe, slips right onto it,....

 

[Showkey]

Got a feeling that bad boy is be not 93% efficient

 

[volaredon]

kind of old thread, I'm gonna revive.
I am installing a 100K BTU Modine as we speak, looks identical to one in these pics, model PD 100. Mine was manufactured in 2006, looks like it was never fired. I have had since at least 2011, and as of yet never used by me. Definitely was hooked up electrically though, by a PO. I bought via CL from another guy that never got to use it because of headaches put up by the town he lives in, over in NW Indiana, not allowing the homeowner to DIY-dig and run gas line from house to garage And all of the estimates from "licensed contractors" proved to be too expensive for him.
He got it from a guy that demo's buildings in and around downtown Chicago, and this unit came from one of those demo'd buildings.
I have the same 4-3/4 X 7 oval outlet as the OP of this post shows a pic of. , it was a bit of a struggle but did finally get a 6" 30 ga. single wall elbow to stretch over. Gotta head back to menard's in the morning, and get a pc of 6" B vent, I have a pile of B vent here, after I got my roof boot, storm collar, rain cap and came home and pull my stash from the attic and find that my stash of B vent is 5" not 6... great. (came from an auction years ago)

that 30 GA elbow that I got squeezed over the outlet on the back of my unit, seems awful darn thin to take the exhaust heat that will be coming from the heater for very long; all the oval stuff at Menards was ~3"X8" and certainly not stretchable to the size of my heater outlet; this was oval venting meant to fit between 2x4 stud walls.
I bought a 24 ga black 6" elbow also while I was there, one that was meant for a wood stove, and that elbow came apart at the 1st seam before getting it bent into shape to go over that outlet (so is now in the garbage) I was hopeful that would fit, as much heavier as 24ga is vs 30 ga sheet metal.
Question; do I need to go to a sheet metal shop to have a correct, suitable transition elbow made, to go from that heater to my vertical B vent? All the "Install kits" I see available from Modine are for "Hot Dawg" models.

 

[Bondo]

I bought a 24 ga black 6" elbow also while I was there, one that was meant for a wood stove, and that elbow came apart at the 1st seam before getting it bent into shape to go over that outlet (so is now in the garbage) I was hopeful that would fit, as much heavier as 24ga is vs 30 ga sheet metal.
Question; do I need to go to a sheet metal shop to have a correct, suitable transition elbow made, to go from that heater to my vertical B vent? All the "Install kits" I see available from Modine are for "Hot Dawg" models.

Ayuh,.... Or use a stub of straight 6" pipe, Then yer elbow,....

 

[volaredon]

Ayuh,.... Or use a stub of straight 6" pipe, Then yer elbow,....

umm not alot of room for that, I guess I can go back the space of 1 joist and then go up with it.

nother question; From what I have seen online (I found a manual for this particular heater) they (Modine) say they want a 6" stack for this particular heater.
What is so different between this heater and their "Hot Dawg" heaters, as those only call for (I forget now which) either a 3 or 4" stack... same BTU heater.
I have a pile of 5" B vent collecting dust in the attic, would like to have used that instead of having to go out and buy 6" but I did go ahead and buy what is called for. Why would 2 heaters of same BTU, both set up for natural gas, call for different diameter chimney stack?

 

[finn]

umm not alot of room for that, I guess I can go back the space of 1 joist and then go up with it.

nother question; From what I have seen online (I found a manual for this particular heater) they (Modine) say they want a 6" stack for this particular heater.
What is so different between this heater and their "Hot Dawg" heaters, as those only call for (I forget now which) either a 3 or 4" stack... same BTU heater.
I have a pile of 5" B vent collecting dust in the attic, would like to have used that instead of having to go out and buy 6" but I did go ahead and buy what is called for. Why would 2 heaters of same BTU, both set up for natural gas, call for different diameter chimney stack?

I believe the Hot Dawg, along with most or all of the hanging garage heaters sold for home use at the big box and online retailers have a power vent....basically a fan that produces a positive pressure in the burner.

Your unit looks like an older, gravity burner that relies on the verticle flue to generate a draft for the exhaust.