Question about Bosch DHD 865 Stainless Steel Kitchen Hood

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Cover for the exterior down draft exhaust pipe

I had downdraft system installed for for center island, exterior vent pipe needs a covering that will open and close when in use and not. something in a vent line, it is a viking unit.

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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.

Gene
Water Heater Timers Save Money

Mar 27, 2015 | Water Water Heaters

1 Answer

Install a attic vent


I know that you need to install the vent but if you can pick a different location it would be better for energy efficiency because of associated downdrafts that may occur. If you can locate the vent to go through a wall to the outside it would probably be better, If that is too big a project maybe consider an indoor venting system. If you wish to use the attic assure that you add a "draft trap" (see link) and assure you clean the dryer vent pipe at least 1/yr. http://plumbing.hardwarestore.com/51-600-dryer-vent-accessories/draft-blocker-inline-damper-602022.aspx

Jan 11, 2013 | Dryers

1 Answer

I would like to put my cook top on an island in the centre of my kitchen how would i vent down thru a crawl space???


Get a downdraft cook top and drill a hole. Then run the piping to the outside wall of the house and drill again and run the piping thru to the outside. They make outside wall vents like dryer vents only bigger to accommodate the bigger vent pipe. Happy crawling. It will look and work great if you get a good stove. Do your research.

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What size exhaust pipe is needed for downdraft?


I found the answer on the "managemyhome" website. There is a 'manuals' tab that you click on. Then just type in the model number and then you are in business. Thanks for this website. I like it

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Can this be installed over an island?


Bring a focal point to your kitchen by having an island range hood, combining function and elegant form. A suspended hood is also an efficient way to vent
grease, odors and smoke to the outside from a island stovetop while you cook. You can install an island range hood in just a few hours with the right tools
and knowledge.
1.Wear safety glasses and work gloves. Turn off the electricity to your kitchen at the circuit panel. Cover the circuit breaker with a piece of electrical
tape to prevent people from turning the on switch while you are at work.
2.Lay work drop cloths on your cooktop and floor to catch dust and debris. Mark the duct opening with a pencil in the ceiling, where the island hood will be
installed. Be sure the opening is centered directly above your cooktop. Cut the opening using a hacksaw.
3.Go up to the roof, using a cat's claw and hammer to remove stucco, tiles, sheathing and insulation to make way for the steel venting duct. Drop a
plumb bob down the roof, making sure the line is straight down for the ductwork.
4.Follow the manufacturer's instructions for locations, installing 2-by-2 wooden blocks in the ceiling to hold the ductwork hangers.
5.Install the venting duct from the outside of the home, down to the location of the exhaust vents on the island hood. The ducts should easily slip into each
other. Secure all the duct sections with duct sealing putty, using a putty knife.
6.Screw a roof cap on the end of the duct at the roof. Seal any openings or gaps where the roof, ceiling and duct meet with silicon sealant. Let the sealant
dry, then paint with colors matched to the surrounds.
7.Place your hood upside-down on the floor, with the fan and filter facing upward. Locate and unscrew the metal electrical box cover on the island range
hood, to expose the wiring
8.Install the hood cover to the load-bearing ceiling frame with the package hardware through the four inside mounting corner flanges on the cover.
9.Measure what will be the distance from the bottom of your hood to the cooktop; it should not exceed 30 inches for exhaust efficiency. Have a helper hold
the hood in place while you attach the hood on the hood cover using the included screws. Use a level be sure the hood is level as mounted.
10.Connect the electrical wiring by consulting the manufacturer's suggestions or hire an electrician if you are not familiar with house wiring. Tuck the wires neatly in the hood electrical box and then replace the cover, after connecting the hood wires to the wall wiring.
11.Remove the electrical tape on the circuit breaker, turn on the electricity to your kitchen and test your island range hood.
8_9_2012_9_29_10_am.jpg

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1 Answer

Installing JED8230ADB Cooktop Grill with down-draft exhaust


I can't imagine directing the downdraft vent back up to a traditional hood type system. Why bother, just don't use the downdraft or get a cooktop without a down draft and save money.

In granite, yes for any cooktop as long as someone can cut the correct size hole. Cooktops must be installed so the top is just about flush with the countertop. They all come with a template for cutting the right size hole in the countertop.

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the only way is to block off/check the flapper., if your not going to use for the winter you can disconnect the vent from under the cabinet temporaily and close off there till you can gain access to check outside grill

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Hi schmidt_rich,

I'm Harvey the Master Plumber.

Your question is: You took over as owner builder when your builder "took the $ and ran". You are installing kitchen cabs now and discovered the PVC vent pipe (which goes into the foundation and out the side of the house) is in the wrong place for the location of the downdraft unit and integral blower. The vent is actually under the electrical connection panel. You were told initially( 2 yrs ago when you bought the downdraft cook'n'vent) there could be no bends in the exhaust fan route or it would change the effectiveness. Does anyone know if it is ok to put a bend in the connection to the vent? Or do you need to redo your kitchen cabinets?

I can syphathise. I have had to deal with this same problem. I have found that one ell will not degrade the effectiveness enough to notice. If you need more then you may need to adjust cabinets.

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

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Installation of down-draft exhaust duct for Jenn-Aire cook top


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