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  1. #1
    Scot Asher's Avatar
    Scot Asher Guest

    Default HVAC ducting question

    Came across this the other day and I don't know what they are there for. Stainless sheets cut with tin snips and bent to form a louvered hood at the boiler and hot water heater vent elbows. What purpose does this serve? Never seen it before.
    Thanks.

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  2. #2
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    Default Re: HVAC ducting question

    Quote Originally Posted by Scot Asher View Post
    Came across this the other day and I don't know what they are there for. Stainless sheets cut with tin snips and bent to form a louvered hood at the boiler and hot water heater vent elbows. What purpose does this serve? Never seen it before.
    Thanks.
    .
    Hi Scot,

    The metal pieces were added to try and capture heat from the vents .
    ( aka free , recovered or recycle heat from the vent gases.)

    Too bad they drilled holes ( not allowed ) in the vents as now they need to be replaced.
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  3. #3

    Default Re: HVAC ducting question

    Screws are required for single wall vent connections, so I don't see why it's really an issue having more screws penetrating the vent elsewhere. Very oddball set up though.

    Billy, do you have a cite/source I can check out in regards to screw holes not being allowed?

    thanks.....


  4. #4
    Scot Asher's Avatar
    Scot Asher Guest

    Default Re: HVAC ducting question

    Very strange and prob.not that affective.
    Thanks Billy


  5. #5
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    Default Re: HVAC ducting question

    Quote Originally Posted by Brandon Whitmore View Post
    Screws are required for single wall vent connections, so I don't see why it's really an issue having more screws penetrating the vent elsewhere. Very oddball set up though.

    Billy, do you have a cite/source I can check out in regards to screw holes not being allowed?

    thanks.....
    Brandon,

    I think more on the lines of Manufactures Installation Instructions and the manufacturer allowing additional holes drilled into their vents ( along the 90 ) or elsewhere other than specific locations at the connections.

    Do you have Manufactures Installation Instructions Allowing additional holes?
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  6. #6
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    Default Re: HVAC ducting question

    If the screws are intact; then there aren't any holes...

    Darren www.aboutthehouseinspections.com
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  7. #7
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    Default Re: HVAC ducting question

    Quote Originally Posted by Darren Miller View Post
    If the screws are intact; then there aren't any holes...
    There will be when you remove those " Heat Recovery Units " not alowed by The Manufacturer.
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  8. #8
    Darrel Hood's Avatar
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    Default Re: HVAC ducting question

    Unless he reinstalls the screws in the holes.


  9. #9
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    Default Re: HVAC ducting question

    Quote Originally Posted by Darrel Hood View Post
    .
    Unless he reinstalls the screws in the holes.
    .
    If those holes are allowed by The Manufacturer.
    .
    or if your going to prescribe The Fix." https://www.buymightyputtynow.com/?rtag=mightyputty&

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  10. #10
    Darrel Hood's Avatar
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    Default Re: HVAC ducting question

    Billy,
    I didn't intend to do either. I just observed that if the screws are reinstalled, there will be no open holes.


  11. #11
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    Default Re: HVAC ducting question

    Quote Originally Posted by Darrel Hood View Post
    Billy,
    I didn't intend to do either. I just observed that if the screws are reinstalled, there will be no open holes.
    .
    But there are holes.
    * drilled, filled maybe OK, ( I would call it out. )
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  12. #12
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    Default Re: HVAC ducting question

    - No 12" rise on flue before an elbow
    - heat baffles were probably installed to keep the heat from melting the pipe insulation, and scorching the ceiling above the 6" flue pipe, ceiling looks like masonite or related wood core / cardboard product
    - I vaguely remember some standard or guideline about that pipe insulation having to be a certain distance above the top of the water tank
    - tank flue tees into boiler flue instead of a Y connection, with that goofy offset elbow on the water tank flue I would guess there's some back draft when the boiler is exhausting
    - nobody wakes up one day and decides they are bored and thinks the best use of time is to install that crap, therefore assume that there has been a problem in the past and this is the supposed fix. Problem was likely heat.
    - did you check the chimney for drafting or a liner?

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  13. #13
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    Default Re: HVAC ducting question

    Metal Tape Repaired Hole on left bottom side of vent.
    * large screw needed to plug apr. 1/2 inch hole.
    ** screw plugged hole = No Hole.
    .

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    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
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