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Venting cooker hood to outside

Can i reduce the ducting pipe from 150 to 100 to vent outside

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Yes you may.


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Posted on Jan 22, 2009

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Posted on Jan 02, 2017

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Powers on, then immediately shuts off. More detailed in comments below This is too aggravating!!!!!!! Characters characters


Hello Kathy: All clothes dryers work on the same basic principle...
1.) Air Flow
2.) Heat
3.) Rotation

Your problem may lie in your duct work configuration and how the exhaust gases are vented; the mere fact that you had blockage could have overheated the dryer's high limit thermostat and/or the thermal fuse...BUT, before I go any further...I need to talk to you about safety!

Gas dryers give off combustion gases that are toxic and DEADLY; DO NOT VENT YOUR DRYER UNDER YOUR HOUSE SLAB to the outside! Especially that you report that it gets WET inside that underground slab- it's against NFPA fire codes (municipal and state building codes, as well) to do that. If that slab ever collapses partially or fully, you'll have no way of knowing it and the toxic gases will back-up into your house.

The safer venting method should be done with 4 inch solid wall vent pipe; and should be vented directly outside. Maximum duct work (straight run of ducting without the use of any elbows) for your model gas dryer, is 65 feet.

If you are using 1- 90 degree, the total length reduces to 55 feet, including the elbow in that measurement

The use of 2- 90 degree elbows, 47 feet; for 3- 90 degree elbows, 36 feet, and for 4- 90 degree elbows, 28 feet- maximum length.

These are per your manufacturer's installation specifications.

Although you should not use more than 4- 90 degree elbows in your configuration, in the event you do, you would deduct 6 feet for each additional elbow used. You want to make sure that you can visibly see the vent pipe (to visually inspect it for defects or for ease of access to clean and service)- and never keep flammables of sorts near the vent pipe due to the heat that they radiate.

I choose solid vent pipe over foil or plastic (in my home, rental properties, and when I do installs) because lint does have a tendency to burn inside the duct work...which could lead to perforation and/or fire. Plus many manufacturers recommend solid vent pipe over other types; and I do not recommend using screws to connect solid vent pipe together with, since lint can catch on the exposed screw that protrudes into the duct. Use a combination of, heat rated duct tape and dryer vent clamps.

Some installers or readers of this will think that this is excessive, costly, and not necessary; through my life's experiences, I have seen unfortunate yet avoidable tragedies. (Don't forget to check & clean your dryer ducts at least once-a-year!- I do mine at the start and end of DST- the same day we change the clocks and the batteries on our smoke and carbon monoxide detector alarms.)

Now, concerning the rest of the troubleshooting process, are you getting any trouble code errors on the electronic panel? If so, what are they?

You have several choices, you can disconnect and remove the high limit thermostat and thermal fuse and check them for continuity or call tech support using their smart diagnosis procedures as outlined on page 35 of you owner's manual. Or you can disconnect the dryer at it's power source (outlet or circuit breaker) and wait a half hour; see if the electronic computer panel resets. Then try running the dryer.

Please let me know how you made out or if you need more help.

Mar 15, 2015 | LG DLE2240W Dryer

1 Answer

Keep getting warning "check exhaust" on a new gas dryer. All exhaust is clear. What's going on?


The CHECK VENT duct blockage sensing system detects and alerts you to blockages in the duct work that reduce exhaust flow from the dryer. This light does not indicate any problems with your dryer. If this light blinks, it indicates that your home's exhaust system/duct work has a serious restriction

Every time the dryer is turned on, the CHECK FILTER LIGHT WILL BLINK, as a reminder to make sure the filter is clean. Always make sure the lint filter is clean before starting a new load; a clogged lint filter will increase drying times.

The Kenmore Elite dryer has a sensor that detects poor exhaust venting, and when it does, a light flashes on the control panel. This warning light does not include a mechanism to stop gas flow, but if it is allowed to flash for an extended period, poor venting may cause the dryer to overheat. As a result, a fuse might blow and disable the gas valve or ignitor. You can prevent this by diagnosing the reason for the flashing indicator light as soon as possible.

In many cases, LINT has built up somewhere in the exhaust pipes.

Check under the lint filter. Pull it out,look inside the slot it fits in, and clear all lint from this area.

Is it possible you have used the WRONG VENT MATERIAL?
Check your vent to make sure it is 4 inch rigid or semi-rigid metal ducting. If your venting is plastic or flexible foil, replace it before using the dryer.

Check your vent hood outside. You may have a restricted or damaged vent hood. It must be clean and free of lint buildup. Check the damper and make sure it opens fully and easily and is free of lint.

I know you said you have no elbows, but I have posted the pipe run lengths with and without elbows. Keep in mind this is with 4 inch rigid or semi rigid metal ducting.

Measure the length of your exhaust system and count the elbows. Use the chart below to see if your duct is too long. If it is too long, have the duct routed to another location that is within the venting guidelines.

0~90 degree elbows=65 ft of 4 inch rigid metal duct.
1~90 degree elbow=55 ft of 4 inch rigid metal duct.
2~90 degree elbows=47 ft """"""""
3~90 degree elbows=36 ft """"""""
4~90 degree elbows=28 ft """"""""

You should always use duct tape or metal tape on all joints, NEVER USE SCREWS, as screws capture lint inside the pipe.

One more note. Lots of people overlook the fact that fabric softeners can build up on the lint filter over time. This buildup can restrict the airflow through the filter reducing dryer efficiency and lengthening drying times. After removing lint, if the filter looks dark or dirty when held up to the light, follow these steps to clean:

Use hot soapy water and a stiff brush to clean
the filter.
Make sure the filter is completely dry before
reinstalling it and using the dryer.
NEVER operate the dryer with a wet lint filter.

Oct 29, 2014 | Kenmore Dryers

1 Answer

Dryer vent duct


The vent pipe codes are based on the fact that the blower in a typical gas dryer can only 'push' a certain volume of air through a certain sized duct for a certain number of feet. Reduced volume of airflow means higher temperatures thus higher risk of fire.
First option ... is your dryer anywhere near a side wall, which would allow you to shorten the total length of duct required to reach the outside to something less than the 14 ft code limit ?
Second option ... upsize the standard 4" dryer exhaust duct to 6" to compensate for the 30ft length
Either way, in the absence of an external forced draft booster fan ( a.k.a. 'power vent' fan ) you should be using metal exhaust duct not plastic.

Jul 28, 2013 | Whirlpool Dryers

1 Answer

No ducting pipe inside the cooker hood chimney what do i need to duct outside


Depends...does the vent access attic?...if so...attach vent material from hood and penitrate roof with roof kit....at lowes

Dec 09, 2011 | Kitchen Ranges

1 Answer

We have question to ask you for Miele Laundry dryer model T4804 C. Our client will install this model in the apartments. They suggest us to connect Dryer vent pipe to the main kitchen exhaust duct of the...


if you use the kitchen exhaust it will ruin the kitchen ducts and forse flow hot air and lint onto the range hood into the kitchen . . stupid advise .. it needs to be ducted directly through the wall to outside using a rain gard the temp can get as high as 47 degrees hot but not too hot it forses air out at a ratio of aprox 15 psi



merry christmas

Dec 22, 2010 | 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.

Sep 01, 2010 | Electrolux Icon Downdraft Ventilation...

1 Answer

Dryer says check filter and it is clean


Air flow in the duct work is restricted... and the dryer sensor thinks that the filter is clogged.

You will need to take a fluffy cleaning wand and, with the filter removed, try loosening up some of the accumulated line in the duct.

Next, remove the lint pipe from the wall connector and try cleaning it and the pipe for as much distance as you can reach.

Finally, go outside and check the vent. It needs to be clean and clear of obstructions... also, needs to close when the machine is off.
You can do testing on the outside vent with "air dry" setting - hot air is not required... Keep cleaning ductwork until the outside vent passes air freely.

After air flow is restored, the sensor in the "VENT" alarm will act nice.....and stay off

Nov 01, 2009 | LG DLE2514 Electric Dryer

1 Answer

Venting hood to outside wall.


install ducting along with closing flap (so outside wind does not blow in) and power first !

Jan 25, 2009 | Jenn-Air JXT8142ADS Kitchen Hood

1 Answer

Internal cooker hood


Hi judav,

I'm Harvey the Master Plumber.

Your problem is: You live in a flat with no chimney and you would like to install a cooker hood. how do you do this please?

Is there living space above? If so you can't go straight up. If your range is on an outside wall, it can be piped out the back. If only attic or roof above, no problem. Just pipe it straight up useing B-vent pipe or equivlent. If you can't do any of this just get a hood that vents filtered air back into the room.

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

Oct 03, 2008 | Kitchen Ranges

3 Answers

LG DLG5988 installation Vent size


The vent is a 4 inch round opening.  Per the manufacturers specifications, you should only use 4 inch solid metal vent pipe, not plastic or metal foil vent pipes.

Nov 09, 2007 | LG DLG5988 Gas Dryer

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