Vent?

[nbhi]

Can you have a water heater and furnace venting into the same pipe where they enter the chimney?
Also, I can not find the spec on how much slope is needed in a vent for a gas fuel run. I have been looking in the IRC book and nothing. I know its some where.
What about using duct tape on the joints on the furnace, a no no?
Its been a long day already.

Thanks

[Jeffrey R. Pope]

Yes, they can share the same vent. Slope is 1/4 inch per foot (minimum) and "duct" tape is not allowed. . .

[nbhi]

Jeff
Thanks, Can you direct me to where in the IRC it states the slope and duck tape issue?

[Jeffrey R. Pope]

Duct tape is not listed for that type of application. You can simply state that the manufactures require all materials to be listed, otherwise, they could seal the vents with bubble-gum.

I don't have my IRC with me in the field (only my CBC) so I can't give you that reference until this evening. Maybe someone else can help out in the mean time. . .

[David C. Macy]

Is all duct tape a disapproved material for the sealing of ducts?

No, Section 503.3.3.4.3 states the following:

• E503.3.3.4.3 Sealing required. Tapes and mastics used with rigid fibrous glass ducts shall be listed and labeled in accordance with UL 181A.Tapes and mastics used with flexible air ducts shall be listed and labeled in accordance with UL 181B. "Duct tape" is not permitted as a sealant on any ducts.
  
  
  E803.2.8 Duct and plenum insulation and sealing.
  All joints, longitudinal and transverse seams, and connections in ductwork, shall be securely fastened and sealed with welds, gaskets, mastics (adhesives), mastic-plus-embedded-fabric systems, or tapes. Tapes and mastics used to seal ductwork shall be listed and labeled in accordance with UL 181A or UL 181B. Duct connections to flanges of air distribution system equipment shall be sealed and mechanically fastened. Duct tape is not permitted as a sealant on any metal ducts.
  Both of these sections state that duct tape is not an approved material for the sealing of duct. These statements should not be misunderstood to exclude duct tapes that have been listed and labeled in accordance with UL 181A or B. This exclusion regarding duct tape could be better stated this way "Un-Listed and labeled' Duct tape is not permitted as a sealant on any metal ducts.
  In previous discussions regarding this subject, it was stated that "duct tape" could no longer be used as a sealer for duct. Like the aforementioned code sections, clarification of that statement would have revealed that statement was only to be applied to unlisted duct tape.