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Bath fan vent termination

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  • Bath fan vent termination

    Is there a required distance that a bath fan vent needs to be from an openable window. Under 2003 IRC, Section M1506 I am not finding anything to address it. Other than poor design, is there any code addressing this?

  • #2
    Inspector 102,

    Not sure about the reference, but please refer to Section G2427.8, #3.
    From the 2006 IRC:
    G2427.8 (503.8) Venting system termination location.
    The location of venting system terminations shall comply with the following
    (see Appendix C):1. A mechanical draft venting system shall terminate at least 3 feet
    (914 mm) above any forced-air inlet located within 10 feet (3048 mm).
    Exceptions:
    1. This provision shall not apply to the combustion air intake of a
    direct-vent appliance.
    2. This provision shall not apply to the separation of the integral outdoor
    air inlet and flue gas discharge of listed outdoor appliances.
    3. A mechanical draft venting system, excluding direct-vent appliances, shall
    terminate at least 4 feet (1219 mm) below, 4 feet (1219 mm) horizontally from,
    or
    1 foot (305 mm) above any door, operable window, or gravity air inlet into
    any building.
    The bottom of the vent terminal shall be located at least 12
    inches (305 mm) above grade.
    4. The vent terminal of a direct-vent appliance with an input of 10,000 Btu
    per hour (3 kW) or less shall be located at least 6 inches (152 mm) from any
    air opening into a building, and such an appliance with an input over 10,000
    Btu per hour (3 kW) but not over 50,000 Btu per hour (14.7 kW) shall be
    installed with a 9-inch (230 mm) vent termination clearance, and an appliance
    with an input over 50,000 Btu/h (14.7 kW) shall have at least a 12-inch
    (305 mm) vent termination clearance. The bottom of the vent terminal
    and the air intake shall be located at least 12 inches (305 mm) above grade.
    5. Through-the-wall vents for Category II and IV appliances and
    noncategorized condensing appliances shall not terminate over public
    walkways or over an area where condensate or vapor could create a
    nuisance or hazard or could be detrimental to the operation of regulators,
    relief valves, or other equipment. Where local experience indicates that
    condensate is a problem with Category I and III appliances, this
    provision shall also apply.




    .
    Please pray for Wilson ("Daddy-O") and his family!


    Comment


    • #3
      Try 303.4 & 303.5 in the 2003 IRC. You might be thinking of Appendix C, which is for IFGS exit terminals for mechanical draft and direct-vent systems.

      Comment


      • #4
        That's were the vent should dicharge, one foot above the front entry door! Does'nt that pass the smell test? ;)

        pu1

        Comment


        • #5
          Since this vent is not connected to a fuel burning appliance, I did not think that Section 24 would be applicable and the Section 1506 would apply. Again no reference to clearances since there is no hazardous exhaust (depending on appetite) being discharged.

          Comment


          • #6
            Section 303.4 does state not directed into walkways, but this is the back of the house, directly above an openable window. No does not pass the "smell test" but does not appear to be a violation.

            Comment


            • #7
              Originally posted by Inspector 102 View Post
              Is there a required distance that a bath fan vent needs to be from an openable window. Under 2003 IRC, Section M1506 I am not finding anything to address it. Other than poor design, is there any code addressing this?
              There is no requirement for termination.

              Comment


              • #8
                Originally posted by Inspector 102 View Post
                Section 303.4 does state not directed into walkways, but this is the back of the house, directly above an openable window. No does not pass the "smell test" but does not appear to be a violation.
                As you noted, it stinks, but we can't regulate stupidity. In our AHJ, we allow termination at the soffit vent, which pretty much guarantees being directly above an openable window. For what it is worth, not many people open their windows anymore.

                Comment


                • #9
                  IRC2006 Sec
                  M1501.1 Air shall not be exhausted into an attic, SOFFIT, ridge vent or crawl space.
                  M1507.2 Exhaust air from bathrooms and toilet rooms shall not discharge into an attic, crawl space or other areas inside the building.

                  I'm with you Papio, let them discharge to the house soffit as long as they have soffit vents. Some builders in this area don't like the looks of soffit vents on the front of a house.

                  pc1 or pu1

                  Comment


                  • #10
                    Papio, were legal, see IRC2006, M1507.1 General

                    Comment


                    • #11
                      Bath exhaust can terminate in the same locations as an operable window.


                      Francis
                      ACCESS TO VIRGINIA CODES: 2009& 2012 Virginia Codes

                      Comment


                      • #12
                        Our AHJ 2006 IRC amendment:

                        M1501.1, Outdoor discharge. Change to read as follows: The air removed by every mechanical exhaust system shall be discharged to the outdoors. Air shall not be exhausted into an attic, soffit, ridge vent or crawl space.
                        Exceptions:
                        1. Whole-house ventilation-type attic fans that discharge into the attic space of dwelling units having private attics shall be permitted.
                        2. Bathroom exhaust fans may be ducted through an exterior soffit, provided that the exhaust duct discharges through a soffit vent to the exterior.

                        Comment


                        • #13
                          Originally posted by Pcinspector1 View Post
                          Papio, were legal, see IRC2006, M1507.1 General
                          interesting PC1. That seems like a grey area when it comes to bathroom windows though...almost makes me want to use appendix C as standard to prevent recirculation?

                          Comment


                          • #14
                            For those without the slightly above average book (italics are areas with black revision bar adjacent to):

                            M1507.2 Recirculation of Air. Exhaust air from bathrooms and toilet rooms shall not be recirculated within a residence or to another dwelling unit and shall be exhausted directly to the outdoors. Exhaust air from bathrooms and toilet rooms shall not discharge into an attic, crawl space or other areas inside the building.

                            Comment


                            • #15
                              When it comes to bath fans IRC took out the termination for them, however IMC 2009 section 501.2.1 note 3 it still has the 3 foot rule so here that is what we used for bath fans for all buildings.
                              Good Luck
                              Justin

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