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Boiler-Venting Considerations - Heating Help

The boiler flue gases could condense until the stack gets warm, causing rollout. Once the stack was warm, the draft could be very high. A good rule of thumb is that a draft control should be used if the chimney is over 30 feet high.

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Venting a Natural Gas Fired Boiler | This Old House

Dec 22, 2007 · Generally the SS chimney has to be in a straight line from the cellar to the roof; there is some bend allowed in the connecting flue pipe from the boiler to the chimney, as long as at least 1/4" upward pitch per foot is maintained. Moving the boiler to the side of the cellar where the chimney will go up to the roof is the most practical.

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Guide to Side Wall Vent Chimneys & Flues - Direct-Venting

The outlet/inlet of the vent and air intake terminations shall be a minimum of 12 inches above highest anticipated snow level. The vent outlet must be installed a minimum of 12 in. above the air intake inlet. The combustion air intake shall be installed upwind of the vent outlet when exposed to prevailing winds.

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horizontal multistage hot water boiler flue through roof

High Efficiency Hot Water Cylinders 2G Products Centrifugal Pumps The pump will be driven by electrical motor assembled on a common base plate with the pump through a flexible coupling Multistage Horizontal Pump made of stainless steel 2G Centrifugual- horizontal, Vertical, Boiler feed, fire water, multi stage, Rotary Screw, Recipro

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High Efficiency Flue Termination - InspectionNews

Re: High Efficiency Flue Termination. Generaly when you see the roof termination it was installed when the house was being build, for they have open cavitys to run the pipe. The side wall venting is generally done on change out systems where the origional unit was a much lower eff. system. Hope this helps.

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Can a high efficiency furnace be vented through a masonry

Re: Can a high efficiency furnace be vented through a masonry chimney? Timothy Miller Howdy, how old is the chimney? pvc is real cheap to install inside the old chimney and it will give the peace of mind that co2 is not leaking into the house from an old chimney

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combi flue through a flat roof | DIYnot Forums

Is it possible to have the flue of a combi boiler going through a flat roof? I am considering having one fitted, but wanted to know whether it could be reliably done without a leak. Some installers advise against it becuase they say it is tricky and prone to leaking, damaging the boiler in the process.

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Guide to Side Wall Vent Chimneys & Flues - Direct-Venting

In comparing the venting of exhaust gases from a high efficiency furnace, boiler or water heater with the venting of exhaust gases from a conventional heating system it will be immediately obvious that the high efficiency equipment exhaust is produced at a low-enough temperature that it is vented through comparably small-diameter plastic piping rather than a cooled, fire-protected metal heating vent.

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Should a Gas Furnace Flue Pipe Go Through the Roof or the

That depends on whether you have a standard efficiency or a high efficiency furnace. If your furnace has an AFUE rating  below 90 percent, it will most likely have a flue pipe that goes up through your roof. Thats because the combustion byproducts are in a gaseous form, so the gases can float up through the flue pipe and out of your roof.

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Flue exit through pitched roof | DIYnot Forums

Horizontal flues are usually more reliable as few people seem to be able to properly seal a vertical flue. It must tip back towards the boiler by 3° apart from the terminal length which can be horizontal or tip back. The prices you are quoting seem pretty high and lower prices may be possible.

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Condensing vs. Non-Condensing - US Department of Energy

Orphaned Water Heater. Many homes utilize a combination venting system through a chimney where the WH & Furnace share a vent. In existing homes where an older non-condensing Furnace is replaced by a 90+ efficiency appliance, an Orphaned Water Heater can occur.

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Back to Basics: Venting for Gas-Fired Boilers | 2003-06-04

Jun 04, 2003 · As the efficiency of a boiler goes up, the temperature of the flue gases go down, and the gases are more likely to condense in the flue. When combustion efficiency exceeds approximately 83%, there is a good possibility that the flue products will condense.

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Gas Furnaces:Ventilation and Combustion Air | hvac machinery

Oct 19, 2015 · High-efficiency gas furnaces vent the gases and other byproducts of the combustion process through PVC (plastic) pipe, not the metal pipe used with standing-pilot gas furnaces. The PVC exhaust pipe extends vertically through the roof or horizontally through a sidewall to the outdoors. The latter is the typical connection to a replacement furnace.

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What Does It Mean When White Smoke Comes Out of My - Hunker

If your home uses a high-efficiency boiler, condensation will be present in your chimney or flue system the majority of the time the boiler is in operation. The construction of the chimney and flue in your home must be sufficient to withstand the almost constant presence of water vapor.

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High-Efficiency Heating: In Praise of Plastic Chimneys

Sep 11, 2013 · After being preheated in the boilers secondary heat exchanger, the water gains its final level of heat by passing through the primary heat exchanger the one directly exposed to the hot flames above the burner module. High-efficiency furnaces work in much the same way as high-efficiency boilers do, substituting air flow for water flow.

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