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  1. #1

    Gas Equipment venting to an exterior metal chimney

    I am looking for advice for venting a boiler and wh into an outside chimney 40 Ft high
    the boiler is fan assisted 233 MBh and wh is Nat draft 75.1 MBH , total gas load 308 MBH
    the outside design temp is 12 deg f

    the chimney is not specified yet . a 7" interrnal type B vents works inside, but owner doesn't want to lose space.
    i was going to spec a stainless steel chimney for outside
    the only tables i can find in NFPA 54 are for exterior masonry chimneys and the and i cannot satisfy the minimum gas input in table for a 40 ft high chimney

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,607
    You need some kind of liner or you will condense the gases from both units. B vent down the chimney will be great.

    Sent from my HTC VLE_U using Tapatalk 2

  3. #3
    Quote Originally Posted by BaldLoonie View Post
    You need some kind of liner or you will condense the gases from both units. B vent down the chimney will be great.

    Sent from my HTC VLE_U using Tapatalk 2
    ok
    what about using a class A dbl wall ext chimney w/o a liner

  4. #4
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,480
    that piping job is gonna be expensive!

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