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condensing concentric 2/4" vent for Rinnai RUR199iN

I have chimney flue 47' long and I need condensing concentric 2/4" vent for Rinnai RUR199iN
is there flex condensing concentric 2/4" vent ?

Comments

  • I've never heard of flex concentric. Can you get your fresh air from somewhere else?


    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hourTwo btu/ per sq ft for degree difference for a slab