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Old 08-03-2012, 08:29 PM   #1
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Flexable aluminum flue liner


Hey All!
I want to install flexible aluminum flue liner in my chimney (there is no flue liner in this chimney). I am venting a Gas furnace ( 82% efficiency) and a 40 gal. gas water heater. My questions are: what diameter venting pipe do i need to vent both of these appliances? I am going to use flexible vent pipe, do i need to use stainless steel or am i ok with aluminum? and last but not least, do i need to insulate this venting pipe ( the majority of it will be traveling interior within the house until it get above the roof line, with a approx 6 ft above the roof line.

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Old 08-04-2012, 05:44 AM   #2
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Flexable aluminum flue liner


Moved to HVAC forum.

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Old 08-04-2012, 05:46 AM   #3
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Flexable aluminum flue liner


Liner size depends on the size(BTU input) of the appliances connected to it, the lateral length and the height it is/will be.
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Old 08-04-2012, 06:25 AM   #4
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Flexable aluminum flue liner


In addition to beenthere's comments: Stainless is required in my area, but may not be in yours. Check with your local code office (but be prepared to have them balk at you venting a fossil fuel appliance - often that must be done by licensed contractors).

No, you don't insulate it. The goal is to remove waste gases from the living space, not to retain heat.
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Old 08-04-2012, 07:00 PM   #5
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Flexable aluminum flue liner


how many total btus will you have...size of furnace and water heater...alot in my area are 5"....but again need to know your sizes..
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Old 08-05-2012, 07:55 AM   #6
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Flexable aluminum flue liner


My gas boiler btu/hr is 140,000. My 40 gal gas water heater is 38,000 btu/hr. making it a combined total of 178,000 btu/hr. The vertical ht of the chimney is 30'. The current vent is 6"...do you think that would be a sufficient diameter venting flue size?

Last edited by fredster; 08-05-2012 at 08:15 AM.
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Old 08-05-2012, 11:23 AM   #7
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Flexable aluminum flue liner


Quote:
Originally Posted by fredster View Post
My gas boiler btu/hr is 140,000. My 40 gal gas water heater is 38,000 btu/hr. making it a combined total of 178,000 btu/hr. The vertical ht of the chimney is 30'. The current vent is 6"...do you think that would be a sufficient diameter venting flue size?
yes 6" should handle about 238,000 btu you do have to figure out run from appliance to chimney and if its single wall connector... but I think you should be fine...


Last edited by ben's plumbing; 08-05-2012 at 11:28 AM.
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