Vent running qustions. Exhaust pipe.

[fast823]

Bought a used Modin 130,000 BTU hanging furnace. Model P130AB I belive and we are getting it mounted. I have a question on th exhaust pipe. It is mounted in the corner of the shop and wondering if I can vent out the wall horziontally? I was told it may need to be vertical due to gravity exhaust. We really don't want to go up through the roof due to it is winter and the roof is metal. I was wondring if I could mount like picture I spent a lot of time creating. Also if anyone can prvide pics on how you mounted you exhaust pip on non power vented hanging heaters. I can provid meaurements if needed. The pipe that came with the heater is 7 inch.

 

[Steve NW Ohio]

I'd suggest that you contact (e-mail) Modine with this question,
and give them the model and serial number of the heater.

http://www.modine.com/v2portal/modine.portal

I've found over the years that they are very good company to work with
and will assist you in getting the unit installed properly.

 

[Cast Iron Nuts]

Fast

Here is a few things to consider.

1 Always follow manufactures specs just for insurance purposes

2 Condensation problems could occur with the main vertical stack located outside the building.

3 Your main vertical stack is what gives you your stack action( velocity the hotter the B vent is the higher the velocity).The appliance may have a hard time venting with the B vent located outdoors.

Good luck trying to seal that metal roof it will be a thorn in your side for years to come.

My advice would be to change out Modine heater for a sealed combustion unit heater

 

[fast823]

Thanks for the info guys. I am having a hard time finding a manual and a e-mail for modine. For condensation I was going to use a drip leg like picture. I was going to mont like this except go right out the wall. I really don't see much of a difference between going up through the ceiling like the pic or like my great drawing. Either was the cold air will be on the vertical tube.

 

[Cast Iron Nuts]

Fast

Where you are going to locate the base tee outdoors is the most restrictive area of the vent system meaning velocity is going to slow down at that point. When the velocity slows condensation will form. When the base tee fills with water freezes a few times and then melt and water will start to run down the breeching back to the unit heater and then drip on the floor inside your garage.

Now, locating this base tee inside doesn't expose it to outside ambient temps meaning velocity at this point will move fast enough to carry the combustion gases out of the B vent before in changes from a vapour to a liquid in the base of the b vent

 

[fast823]

I guess I could try and place the drip leg inside or just keep the it clean if I mount outside.