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jasonresno 01-12-2010 10:34 PM

Gas Line Question
OK: Here's the deal. My brother in law gave my wife and I a washer and dryer. The issue was that we have to run a gas line to the new appliances. The gas line that is in my house already is 1/2 inch but the tools he has only applies to 1/4 line. So he's going to run the 1/4 line to the appliances.

My question is: Is this dangerous? Is it dangerous to downsize the size of the line? I figure it isn't because it's going to a regulator and the regulator will take care of the flow but....

Yeah, any help?

brewmastr 01-12-2010 10:44 PM

what size line does the dryer take?

jasonresno 01-12-2010 10:46 PM

I believe it takes 1/4 inch.

brewmastr 01-12-2010 10:47 PM

well if it take 1/4 inch it needs to be downsized anyhow. so you should be fine as far as i am aware.

SULTINI 01-13-2010 06:55 AM

Reread the manual to be sure and if it takes 1/2 inch I would be leary depending what else is drawing from the 1/2 in line.

Bondo 01-13-2010 08:01 AM


The gas line that is in my house already is 1/2 inch but the tools he has only applies to 1/4 line.
Ayuh,... Every dryer I've ever seen needs Atleast a 3/8" line, with 1/2" being better...
Downsizing the line to 1/4", will lead to inferior performance...

It don't cost That much for the Proper tools to do the job,... Right...

kennzz05 01-13-2010 10:05 AM

you need to do a figure out how many btus that 1/2 is feeding already 1/2 for a whole house is mighty small and is probably maxed out already. you may have to run it back to where the largest pipe is now usually 3/4 or 1
' at the meter
nat gas or propane? make sure dryer is configued for the type of gas youre using or youll have probs

beenthere 01-13-2010 01:53 PM

You may need to run a larger line to the dryers area. And then run the 3/8" line.
A 1/2" main gas line doesn't carry a lot of gas.

jasonresno 01-13-2010 05:57 PM

Thanks for the replies so far guys.

My house (an older single story home) is about 1200 sq ft with natural gas. Not big at all. he wants to T off of the gas line, run it about 15 feet through my attic, and pull it down to the dryer. I'll let him know what you guys said there any actual physical danger in downsizing the gas line? I don't want gas building up and my house exploding (I'm bein' dramatic, but you get my point).

Thanks again.

beenthere 01-13-2010 08:24 PM

Yes. Can cause CO production from the water heater and furnace beside the dryer itself.

hvac benny 01-14-2010 04:18 AM

Get a gas contractor to do this under permit, because if something goes wrong your ass is covered. Sizing gas is relatively easy, but if you don't know what you are doing it will result in trouble (not blow yourself up, but maybe "go to sleep and never wake up" kind of trouble). As for 1/2" and 1/4" lines? Not enough info! What material? What pressure is the meter supplying? How long is the longest run? What is the total demand? Even with all of these questions answered I still couldn't give you a definitive answer to what you need.

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