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Old 10-08-2009, 08:04 PM   #1
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Dryer Duct Run


I have a gas dryer vent duct (rigid round) and need to move it. Following is what the final configuration would look like. Can someone tell me if this is feasible?

A) 90-degree bend out of back dryer;
B) 4 feet from dryer, 90-degree bend up with 6-foot staright run into ceiling;
C) in ceiling, 90-degree turn to outside wall (1 foot through outside wall);
D) outside of house, 90-degree turn (1 foot);
E) final 90-degree turn with 16-foot straight run.

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Old 10-08-2009, 08:20 PM   #2
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Dryer Duct Run


Feasible...yes

Legal....no

Code limits dryer vent to 25 ft and each 90 adds 5 ft

Using your lay out would equal 44 ft

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Old 10-08-2009, 11:40 PM   #3
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28' of straight and 5- 90*s= 28 + 25 = 53' But that's not the new math.

Check your dryer manufacturer: 25' minus 2ft. per 45* bend or 5' per 90* EXC 1501.3, 2437.2 --- Longer OK if manufacturers instructions permit ... 2437.5.1 It has to terminate outside, it cannot run outside of house for 16'. Check with your local Building Department.
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Old 10-09-2009, 11:43 PM   #4
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Dryer Duct Run


Aside from plumber101's math , both posts above are completely correct.

Many jurisdictions will permit longer-than-normal vent lengths if the dryer being installed is listed to push longer distances. Personally I think that is bad practice...Dryers break, people move, dryers get replaced. If the dryer can't push the vent length there is a very real long term fire hazard.

The 90 bend behind the dryer can be eliminated using one of the recessed wall box vent terminals that are on the market now. That buys you five feet, but not enough.
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Old 10-10-2009, 11:18 AM   #5
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Question, KC. Current code allows an 8' metal flex ducting from dryer to exterior pipe with no concealed connections. If at the dryer and the wall , the flex turns a 90*, why are those not considered turns to reduce total pipe length? OR are they?
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Old 10-10-2009, 01:41 PM   #6
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Dryer Duct Run


Although they're bends just like prefabricated elbows are, bends in flexible vents aren't mentioned by code. Logic would dictate that they should be accounted for in the length calculation, but it wouldn't be enforceable in my opinion.
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Old 10-10-2009, 05:52 PM   #7
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Dryer Duct Run


Sorry for the hijack.......
A few years ago, in a new home, I roughed in a dryer hood on an outside wall directly behind the dryer location.
When the homeowner moved in, he bought a 25 foot box of vinyl flex, pulled it out of the box, connected one end to the dryer, the other end to the hood, shoved the dryer into place, and stuffed the remainder of the flex behind the dryer.
After 2 days he called me complaining that his dryer seemed to be running hot.

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