Modine Separated Combustion - Vent Routing

[SVTforme]

I am just getting a new garage up and running, so I figured it is about time I chime in with a few questions for a first post.

After doing a lot of research on the Modine/Lennox/Mr. Heater/Reznor/Sterling etc, I decided to go with a Modine HDS75 separated combustion with a 2 stage heater.

I was wondering what everyone does for the separated combustion side of things. I don't know if I will like the look of a 5 ft vent pipe rising above the surface of the roof, so I am trying to see what other options there might be.

I know there are several versions of the concentric vent kit out there, just wondering if they are worth the money, and what they look like inside and outside the garage.

I guess the other option is to use to separate vents, but then you don't get the benefits of running the intake air outside of the exhaust air in the vents (not sure how big an advantage this provides).

While on the topic - is anyone running the 2-stage units?

Thanks!

 

[Sack]

why 5'? seems a bit much

 

[SVTforme]

I guess it all depends on what manufacturers recommendations you reference, but some of the stacks can be over 4" once everything is factored in.

With the separated combustion, you have the intake and exhaust on the same stack, with the intake being closer to the roof. Depending on where you live, the intake has to be above a certain level on the roof so it is above the expected snowfall levels. The intake also have a certain height. From the top surface of the intake, you have to leave a certain amount of distance to the exhaust. On top of this, the exhaust also have an installed height.

I am just trying to get some ideas for this before I install my setup in a couple of weeks.

This is what Reznor recommends for the UDAS models:

 

[rickairmedic]

There are better looking concentric vent and they dont have to go out the roof if they are PVC they can go out through the side of the building you can also run them seperate if they are PVC I havent put in any of these heaters myself but I do heating and air for a living and 90% and above furnaces use PVC for the vent pipe and it is usually run out the back or side of the building as long as you are more than 6' from a door or window ytou are fine .


Rick