Vent connection for Reznor UDAS-45 (separate combustion)

[GSinILL]

Total newbie here, just signed up the other day, so hello everybody

Anyway...
I am putting a Reznor UDAS-45 heater in my 2 car garage.
Electric and natural gas connections are ready and I got Reznor's connection kit including the concentric box.
Next step is to determine the vent connections for vertical venting through the roof.

The manuals provided by Reznor are pretty good in describing the venting post the concentric box.
Where I am struggling is with the connection between the heater and the concentric box.
I was planning to use 2 tees, directly attached to the outlet and inlet at the heater and then go straight up into the concentric box.

Now, looking at the location of inlet and outlet on the back of the unit, I am pretty sure they would actually interfere with each other, i.e. I wouldn't be able to place them so they are both in parallel allowing me to go straight up.
Here's a (crapy) picture with one of the tees attached:

Since I assume Reznor doesn't have some flawed design, what is the ideal way of connecting the heater to the box, e.g. first straight out, then a tee, elbow etc.?

I will be fairly flexible with both, the placement of the heater as well as where the vent will be going through the roof, so I should be able to accommodate whatever seems to work best.
Also, do I need dual wall pipes for the connections between the heater and the concentric box or can I use single wall?

Some pictures of how some of you might have connected separate combustion heaters would be a big help as well.

Thanks in advance!
GS

 

[thammel]

I hooked up a udas 60 but went out horizontally. I used their concentric kit but going out through the side wall was relatively easy. Using type 3 stainless steel pipes (z flex) was not cheap and not easy to cut. But it worked out well.

Tom

 

[frugalguido]

I went horizontal, but here is a picture on how I did mine, used single wall pipe. You are going to love that heater, it's worth the extra money.

 

[GSinILL]

I went horizontal, but here is a picture on how I did mine, used single wall pipe. You are going to love that heater, it's worth the extra money.

http://s249.photobucket.com/user/datsunwizard/media/file_zps0vfvi6xz.jpg.html

Thank you, that helps a lot.
I see you actually have a "drop" in the vent line from the heater to the box. I might have to do the same since I want to keep the heater as close to the ceiling as possible.
I thought I read somewhere that a drop like this could be an issue.
Also, isn't it recommended to have a tee to capture any moisture or condensation that might build up in the vent pipes?

BTW, I like the posters ;-)

 

[frugalguido]

I too wanted to keep it as close to the ceiling as possible and I already had my air lines run which is why the box is where it is. Remember that the vent line is forced air. There is a lot of moisture that comes out the vent, in fact the chrome grill that Reznor supplied on the exterior is starting to rust. If I was going to do it again, I would use stainless pipe, but its $$$.

 

[thammel]

The reznor literature calls for some slope down from the unit to the outside (may be 1/4" per foot). I used all type 3 stainless steel piping. This was not easy to get and I used Z-vent. It's expensive but is good and will last forever.

Tom