Venting under decks

Jeffrey Campbell

Sometimes you just have to work with what you have. I am playing clean up and folowing another contractor. The just is nearly completed and I am finishing the heating system. The problem is that the boiler was approved by the local building department to be vented under the deck. There is a Munckin on site. The deck is large 5000 sf and very spacous underneath 8 ft tall and open on the sides. I am afraid of recirculation beteen exhaust and combustion air. Any ideas.

Robert O'Connor_7

I'd make sure about that approval..

It's not good workmanship type practice to install under a deck. I'd give a call to the AHJ and talk directly to the guy that would come out there as well as the building inspector, they MAY have missed it due to any number of reasons..Do you have any other options for venting? Sounds like one heck of a deck......Robert O'Connor/NJ

Brian

Venting under deck

I have 2 Trinitys venting under decks and in both cases I extended the exhaust out past the edge and insulated the exposed portion.I would think from a building point of view that you could have ice build-up.

Good Luck
Brian

Jeffrey Campbell

The deck is so big I can't get to the edge and terminate past.
I asked the inspector today why he approved the vent location and he said that if its not in the installation guide he can't
turn down the vent location. I looked over and over and it does not say anywhere not to vent under a deck. We need to bring this up to the Uniform Mechanical Code.

Darin Cook_3

Call the source

Call Heat Transfer Products at 1-800-323-9651 talk to Guy or Chuck. They will tell you for sure what installation guidelines to follow with the Munchkin.



Hope this helps,

Darin

H. Green

I can't think of a better way to build a skin of ice on a deck than to pour moist warm air 2' below the frozen surface. Ever walked (or tried to walk) across a wooden bridge over a stream on a cold fall morning?

Don't do it if it gets cold where you are.

H. Green

Ice

I can't think of a better way to build a skin of ice on a deck than to pour moist warm air just below the frozen surface.
Ever walked across a wooden bridge over a stream on a cold morning?

Rookie

Is the heating unit ( Munchkin) heating the domestic hot water? Think of nice it will be sitting on the deck enjoying a nice cold ice tea, while someone showers you get to breath in the gas fumes coming up from underneath the deck.

Steamhead

I'll second that

You might also want to get in touch with Tim McElwain. IMHO he's the best, and I'll be very surprised if he hasn't run into this before. You can e-mail him at gastc@cox.net .

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Jeffrey Campbell

ice!

Yea I never thought about slipping on the ice especially walking out to the hot tub. Thinking about getting all warm and relaxed then boom your on your butt hurt and cold! Great point. Jeffrey

Unknown

Vents under decks

have been a problem since we started putting vents out the side of buildings. I will list some of the problems I have run into. Before I do that however I can tell you that a lot of installation instructions do not address this issue and many codes do not specify a restriction. Heres what I have seen:

1. A definite recirculation of flue products contaminating the intake air supply especially if the deck is right above ternmination. In this case with 8' it might be okay.
Some installation manuals call for 18" clearance above the termination of the flue.

2. As someone already mentioned in the winter the icing of the deck.

3. Also mentioned that this unit may be providing domestic to an indirect so summer time on the deck not to pleasnat with flue gas escaping.

4. Probably not a problem here but access to the termination if the deck is low.

5. Terminating under the deck and too close to an experior side wall creating tubulence at the exit point.

As I mentioned with 8' of height it may be okay and work without a problem.

Darin Cook_3

I agree with Timmy

Even if it turns out that the unit will operate under the deck, there are way too many possible negatives in that type installation. There alot of variables involved here and in the end the HO is going to have to deal with it. Is it possible in any way to get the piping up thru the roof?





Darin

Darin Cook_3

A thought

Was there a existing chimney from a previous appliance? It is possible to run a vent pipe up it and use the chimney as the fresh air intake. Just an idea.





Darin

Jeffrey Campbell

Helo Tim

> have been a problem since we started putting

> vents out the side of buildings. I will list some

> of the problems I have run into. Before I do that

> however I can tell you that a lot of installation

> instructions do not address this issue and many

> codes do not specify a restriction. Heres what I

> have seen:

>

> 1. A definite recirculation of flue

> products contaminating the intake air supply

> especially if the deck is right above

> ternmination. In this case with 8' it might be

> okay. Some installation manuals call for 18"

> clearance above the termination of the

> flue.

>

> 2. As someone already mentioned in the

> winter the icing of the deck.

>

> 3. Also

> mentioned that this unit may be providing

> domestic to an indirect so summer time on the

> deck not to pleasnat with flue gas

> escaping.

>

> 4. Probably not a problem here but

> access to the termination if the deck is

> low.

>

> 5. Terminating under the deck and too

> close to an experior side wall creating tubulence

> at the exit point.

>

> As I mentioned with 8' of

> height it may be okay and work without a problem.

Jeffrey Campbell

Hello Tim

The vent is actually about 18" below the deck boards. The total space under the deck is 8' So the deck is actually much closer to the vent. We are working on another vent location I think.
Thanks Jeffrey

ScottMP

also

How about the fact that it will rot the deck away with all that moist air coming out under the deck ?

Scott

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