Flue gas temperatures that do not exceed 400 degress fahrenheit above ambient for category i appliances.
Gas furnace flue pipe sizing.
The design btuh british thermal units per hour capacity of the vent plus the furnace input and efficiency are factors affecting the temperature of the flue gases.
Consequences of improperly assembled vent pipes problematic chimney flue deteriorating chimney walls can be sometimes fatal fire and carbon.
When we are talking about gas furnace vent pipe code we need to talk about the different types of the vents first after all you want to keep your family safe from harm.
Well making sure that you choose the right venting style will protect them.
Oct 13 2012 brent said.
Reduce furnace flue vent connector size below furnace outlet size.
Higher btuh furnaces produce higher flue gas temperatures.
The pipe then slips into the hole and is sealed with a high temperature silicone caulk.
The different types of venting.
To determine the main flue size refer to figure 3 and locate the square inch area of each individual flue size.
I want to purchase a new boiler to heat both sides which i have zoned.
Flue gas temperature flue gas temperature affects vent operation because the hotter the gases are the lighter they are.
You would core a hole 1 4 to 1 2 inch bigger than the outer diameter of the pipe.
To make it simple if you have a gas water heater with a 3 draft hood and a furnace with a 4 flue collar connected to the same chimney flue you d calculate that chimney flue size based on the 3 draft hood the smaller of two.
Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys.
So let s calculate or why don t we skip those calculations and i ll give you the answers.
I have a single 2650 sq ft home that was once subdivided one side had a 133 000 btu oil boiler and i have a 115 000 gas boiler.
In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents some high efficiency furnaces also include a plastic pipe for intake area and all types.
6 flue 28 27 square inches 8 flue 50 27 square inches total 78 54 square inches.
The size would depend on your furnace s flue pipe connection.
Illustrations of proper gas fired water heater venting using type b double wall vent pipe through a roof above or through a chimney below include details for the flue vent connector such as the requirement of a minimum vent connector upwards slope of 1 4 per foot of horizontal run.
Let s say you have a job where you combine a furnace or boiler 8 flue with a water heater 6 flue.
Proper furnace water heater venting is an extremely important issue which depends on the performance of the house chimney chimney flue or other exhaust assemblies.
