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  1. #1
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    4 Gas Appliances go into one chimney. Can one stainless steel liner accomodate them?

    Hi AOP,

    Our son has a duplex in Cleveland that he rents.

    Both the upper and lower apartments have their own gas water heater and gas furnace.

    The 2 gas water heaters are in the basement along with the 2 gas furnaces.

    All 4 appliances separately vent into the chimney.

    Can a single stainless chimney liner be dropped into the chimney and made to connect to these 4 separate current penetrations into the chimney?

    Thank you for any and all comments !
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  2. #2
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    Jun 2012
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    Northern NV
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    Why stainless?

    And it would be more effective and easier if you had the liner with one penetration and common vent before entering the masonry.

    or better yet, as you have very limited rise off the equipment, run 4 separate but smaller liners up the chase... A good HVAC guy will know if this will work using the venting tables and looking at the existing stuff...
    A dying culture invariably exhibits personal rudeness. Bad manners. Lack of consideration for others in minor matters. A loss of politeness, of gentle manners, is more significant than is a riot.
    ― Robert A. Heinlein

  3. #3
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    Jan 2020
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    Thread Starter
    "Why stainless?"

    Thanks for your reply, Juan.

    I have since learned that an aluminum liner would work.

    A chimney man I talked to said this would take two (2) five-inch aluminum liners dropped down into the basement, from where an apartment's water heater and furnace would be hooked up to a liner.

  4. #4
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    Aug 2004
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    S.E. Pa
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    Why stainless steel? Because it lasts, unlike beer can liners. I pull them all the time. 100% of the aluminum liners I inspect are corroded. When you common vent an 80% furnace in one, you'll surely rot it out. You can run one large liner as long as it does not exceed the 7x rule meaning not seven times the cross-sectional area of the smallest appliance connection. Both water heaters will need to be increased to 4" per the code since they have less than 3ft of vent rise. That's why the mfr. put that 4" adapter on the vent hood. Get a chimney pro to run a camera up the chimney to insure no hidden 'pie plates' from unused thimbles of old. Often stuffed with rags or nothing. You want as much vent rise as possible meaning move the wall penetration as high as you can an still meet clearances to combustibles. This can be done with a B-vent connector, which carries a 1" clearance to combustibles vs. 6" for single walled unlisted connector. You'd have to manifold the connectors. Get your contractor to install a post-purge on both furnaces to cut down on condensation. Incorporate a tee at the base of the liner to act as a condensate trap.

    Professional stainless steel liners don't rip apart or easily dent the way aluminum does. SS liners typically carry transferrable lifetime or forever warranties unlike AL. Put low level unlisted CO monitors in each apartment. Note that a draft hood equipped WH common vented 80% furnace is the most dangerous combination but especially because its still allowed by code. Make sure whomever is sizing the liners they derate 20% for corrugated liners plus additional derating for offsets. Smoothwall liners are exempt from derating.

  5. #5
    Join Date
    Jun 2014
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    Dover, DE
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    Where’s the return air ducts for the furnaces in the photo?
    And that 90 for the water heater venting looks rotten.
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486 Instructor & Service Technician

  6. #6
    Join Date
    Nov 2006
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    Athens, Ohio
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    What fool put the manuals against the vent pipe?
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  7. #7
    Join Date
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    Quote Originally Posted by rider77 View Post
    Where’s the return air ducts for the furnaces in the photo?
    And that 90 for the water heater venting looks rotten.
    Maybe that is why they are on the wood?!?!?!
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

  8. #8
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    Thread Starter
    Hearthman, I'll share your info-which will be helpful as our son seeks a chimney contractor in the Cleveland area. Thanks again Bob.--Hank

  9. #9
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    Thread Starter
    Quote Originally Posted by rider77 View Post
    Wheres the return air ducts for the furnaces in the photo?
    And that 90 for the water heater venting looks rotten.
    Rider, the return air is a "wall drop" into the basement. One from each unit. Not ideal IMHO because both duplexes empty into the common basement. You see this in many 1920 era dwellings like this.

    As for the elbow on the water heater, yes, that needs to be addressed.

    I appreciate you PROs on the forum and will share your guidance with our son as he continues to upgrade his rental units
    heating systems, connections and chimney.

  10. #10
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    Thread Starter
    Quote Originally Posted by kdean1 View Post
    What fool put the manuals against the vent pipe?
    Oops. Those things won't be there for long now that you pointed them out.

  11. #11
    Join Date
    Jun 2014
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    Dover, DE
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    Quote Originally Posted by Therm Enjoy View Post
    Rider, the return air is a "wall drop" into the basement. One from each unit. Not ideal IMHO because both duplexes empty into the common basement. You see this in many 1920 era dwellings like this.

    As for the elbow on the water heater, yes, that needs to be addressed.

    I appreciate you PROs on the forum and will share your guidance with our son as he continues to upgrade his rental units
    heating systems, connections and chimney.
    They are pulling return from an open basement with natural draft water heaters right there?!?!?
    That’s unsafe. And I don’t think any of that is code.
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486 Instructor & Service Technician

  12. #12
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    May 2000
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    Indianapolis, IN, USA
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    That basement has to be going negative and pulling flue gases out of the WH draft hoods.

  13. #13
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    Quote Originally Posted by Therm Enjoy View Post
    Rider, the return air is a "wall drop" into the basement. One from each unit. Not ideal IMHO because both duplexes empty into the common basement. .
    Then there must be an opening into the bottom of the furnaces that we can't see in the photo, I hope?!?!
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

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