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Furnace drip leg

rooferman | Posted in Energy, Heating & Insulation on December 24, 2006 02:14am

I am going to install a ceiling mount 45,000 btu gas furnance in my garage.  I will be running a gas line to it from a TEE in my basement.  Thus the line will be running vertically up the wall to the furnace.  Do I put the drip leg near the inlet to the heater or should I put it where the line starts its vertical run up towards the furnace? I am betting near the heater but I want to be sure.  Thanks for your help.  Mike L.

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  1. davidmeiland | Dec 24, 2006 02:35am | #1

    I'm betting the opposite--that you put it in the basement where the horizontal run hits the riser. Use a tee there instead of an elbow. Let's see what Plumbill or Shacko or McPlumb have to say.

    When I moved my water heater I took out a dirt leg that had been in place about 2 years and moved it over a ways. There was some grit in the bottom of it when I turned it upside down to check.

  2. Dave45 | Dec 24, 2006 02:42am | #2

    I ran into this one a few months ago in Redwood City, CA,  and the BI wanted the drip leg near the unit.

    Save yourself some aggravation and ask them before Murphy's Law bites you in the azz- lol

  3. BoJangles | Dec 24, 2006 02:53am | #3

    You should put it between a fuel line shutoff and the gas valve...close to the unit and at the same elevation as the gas valve.

    This allows you to shut off the gas line near the unit and clean the drip leg out if necessary.

     

  4. McPlumb | Dec 24, 2006 03:22am | #4

    I'm in favor of close to the heater, the purpose is to keep crap out of gas valve.

    Had a HO that worked at Lowes, he would furnish the black iron pipe to re route to his furnace. The  ten foot lengths had plastic caps on the ends. When the caps were removed the pipes had rust inside then. Took a fishtape and copper fitting brush both directions about three times to get it clean.

    You never know what migth be in there, close to heater gives better coverage. 

  5. User avater
    IMERC | Dec 24, 2006 03:31am | #5

    near the unit...

    any doubt arises.. put in both places...

     

    Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming

    WOW!!! What a Ride!

    Forget the primal scream, just ROAR!!!

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