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Jenn-Air Downdraft ducting roof Rack w/flapper

I am looking for a high quality roof mounted termination vent cap for 8" O.D. round ducting for my Jenn-Air downdraft Stove Top/Convection oven. The reason for the 8" ducting is that I am using insulated stove piping out of the wall of the house into a cold porch then up through the roof. I have come across a Broan Vent Cap that will accommodate 3-1/2" by 10" rectangular ducting and/or 8" O.D. round ducting. The problem with this Broan unit is it has an aluminum flapper that has no counter resistance mechanism to keep from readily flapping open and shut during weather related wind events. Is there something better out there? I found you guys through a Jenn-Air link. Help!

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  • Anonymous Mar 12, 2014

    Lots of cold air coming down unit that vents through the roof.

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Go to www.luxurymetals.com
there are many good high quality vents on the site

Posted on May 26, 2009

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Hi Snowflow,

I'm Harvey the Master Plumber.

Your problem is: You are looking for a high quality roof mounted termination vent cap for 8" O.D. round ducting for your Jenn-Air downdraft Stove Top/Convection oven. The reason for the 8" ducting is that you are using insulated stove piping out of the wall of the house into a cold porch then up through the roof. You have come across a Broan Vent Cap that will accommodate 3-1/2" by 10" rectangular ducting and/or 8" O.D. round ducting. The problem with this Broan unit is it has an aluminum flapper that has no counter resistance mechanism to keep from readily flapping open and shut during weather related wind events. Is there something better out there? You found us through a Jenn-Air link. Help!

An 8" B-vent cap should work fine. Can be purchased at any plumbing supply. Just make sure you attach it with screws.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey your Master Plumber

Posted on Oct 14, 2008

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1 Answer

What is the minimum vertical vent distant from top of water heater to top of cap. Water heater is stand alone outside furnishing water for military force provider showers unit.


Generally 40 feet for ordinary atmospheric-vented household water heater...
Straight run to roof.
Atmospheric means no power vent... just hot air drafting upwards
Google search: gas vent height code

Atmospheric venting code depends on 4 basic factors:
Diameter of vent--- bigger vent, more draft
How many water heaters are connected to same vent
BTU per hour rating of water heater-- the more gas that is burned per hour, the bigger the vent needs to be
How straight the pipe is -- are there any horizontal or lateral runs
http://www.ameri-vent.com/files/assets/files/1366372183_Sizing26ApplicationGuide1.pdf

http://waterheatertimer.org/pdf/Bosch_Checking_the_draft.pdf
http://waterheatertimer.org/pdf/checking-the-draft2.pdf

Other factors can include
-wind conditions... higher wind across top of vent pipe on roof can reduce draft, and cause downdraft that blows deadly CO into same room as water heater
-vent termination near high walls, trees, high roof peak etc will reduce draft or cause downdraft
-amount of incoming air supply... if water heater is inside a closed room, then there is no air to draft up the pipe, burner will shut down or burn lazy yellow instead of clear blue
-stuff piled up around water heater that obstructs air intake
-dirty air intake screen that reduces air intake
-vent fans inside same room as water heater that pull air down the vent and cause reduction in water heater draft
-generally elbows reduce draft by 10%
-vent cannot terminate near any window door or air intake for another gas appliance
-bird build nest on top of vent pipe after vent termination falls off
-highly acidic gas by-product causes large amount of condensation inside pipe that burns hole in pipe or drips down and damages combustion parts...blower and inline condensate trap and drain might be required
-multiple water heaters installed on same vent line.

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