Hello! I have a boiler, and the exhaust goes from the boiler, via stainless ducting, to the exterior of my house.

The problem is that over the years it's really caused some trouble with the paint. I'm hoping to repaint my aluminum siding next summer, but I'd love to solve this issue before I do that.

Can I direct this away from the house at all?

I don't see any reason you couldn't put a 90* elbow of the same diameter on top of that with a radiator clamp. I would try to match the metals but if its stainless I think galvanized steel is typically ok for contact.

I think that is illegal and the exhaust has to go above the roof to keep exhaust fumes from coming back into the house.

Here is one code for NY City:

http://www2.iccsafe.org/states...ys%20and%20Vents.pdf

Power venting of 80% fixtures is approved in some areas. There are usually setbacks from windows and such. A few lengths of "B-Vent" stainless smoke pipe may solve the whole issue.

I've got a Smith GV100 Power-Vent Boiler (Natural Gas - 84% eff.) that was installed in 2006.

Here's a pic of the vent/exhaust for my system....



It's a 'FasNSeal' Termination Tee made by ProTech Systems, Inc. It is designed to be mounted horizontally.

I'd check the Install/Operating Manual for your system to confirm the specific venting requirements for your application.

quote:

Originally posted by Woodman:
Power venting of 80% fixtures is approved in some areas. There are usually setbacks from windows and such. A few lengths of "B-Vent" stainless smoke pipe may solve the whole issue.

Hard to believe if you had a malfunction of the system.

It is conceivable an 80% efficient furnace can be returned to a chimney vent appliance.

84%, weren't those rated only for power vent because the exhaust is not hot enough to establish draft?

The exhaust seems dirty. Although the discoloration is just as likely burnt finish.

Carbon monoxide is certainly nothing to be fooling around with.

I noticed some of the neighbors must have had a mis-fire on their gas furnaces. The stack through the roof has the top hat blown off. I assume there was an explosion and the force knocked it off. Some are pealed back while others are totally missing.

I don't have gas and never liked it. Growing up, we turned the gas heater in the workshop on and the pilot light had gone out. All the gas went up the chimney luckily.

quote:

Originally posted by 41:
The stack through the roof has the top hat blown off. I assume there was an explosion and the force knocked it off.

If the burner tube is all fouled up in front, a puddle of gas can form in back when the t-stat calls for heat and turns on the gas valve. When this bubble hits the pilot, BAM. It can sound like someone hit the ductwork with a baseball bat. That will give you flame roll-out. I've seen people living with this for years and years.

There is a flame rollout sensor in front that will react to temperature, break a circuit, and interrupt operation of the gas valve. The sensor can be faulty or wired wrong, and flame rollout will eventually melt wiring. Still, best not to store combustibles near the furnace. I think I've only seen a faulty sensor (a sensor which did not fail when exposed to heat) once, but maybe it was the wrong sensor.

Really old appliances do not have modern safety controls, but most of them are in the scrap yard. Gas is safe; it is untrained technicians which are dangerous.

I only do residential gas work for old customers, as a favor, and am not shy about saying, "This is beyond me". The 90+ efficient stuff came onto the market after my apprenticeship, and I never picked it up.

Thanks...that is interesting. These houses were built in 1983-1985 and I assume the furnaces have not been replaced. I would be afraid that the stack could be compromised and leak into the living area.

I don't have gas but heat pump only with electric elements for additional heat.

quote:

Originally posted by Veeper:

Can I direct this away from the house at all?

Very unlikely.

Make/model of boiler and brand of venting?
As the boiler manufacture will list the venting requirements (may make a *brand/s* recommendation for approved venting materials) and the manufacture of the venting material will have installation requirements.

I'm always amazed by the replies 'to venting issues'. You are dealing with a very deadly gas which the human body can not detect. DO NOT BECOME A STATISTIC by doing a DIY mistake. Along with the fact that boilers are not cheap to repair or replace.

quote:

Originally posted by Excam_Man:

quote:

Originally posted by Veeper:

Can I direct this away from the house at all?

Very unlikely.

Make/model of boiler and brand of venting?
As the boiler manufacture will list the venting requirements (may make a *brand/s* recommendation for approved venting materials) and the manufacture of the venting material will have installation requirements.

I'm always amazed by the replies 'to venting issues'. You are dealing with a very deadly gas which the human body can not detect. DO NOT BECOME A STATISTIC by doing a DIY mistake. Along with the fact that boilers are not cheap to repair or replace.

Thanks for the reply. I'll get the make model brand, etc. tonight or when I stop home for lunch.