Fuels and Combustion
ASHRAE Technical Committee 6.10

Meetings Information

Seminar 6 (Intermediate)

Challenges Venting High Efficiency Appliances

Applications

Track: HVAC&R Systems and Equipment 

Room: 370ABDE

Sponsor: 6.10 Fuels and Combustion

Chair: Thomas Butcher, Ph.D., Brookhaven National Laboratory, Upton, NY

    • -Explain safety and operational issues associated with sidewall venting of high efficiency appliances
    • -Design acceptable sidewall venting installations for high efficiency equipment
    • -Describe the technical issues which can occur with common venting of high efficiency appliances
    • -Apply the design guidance to plan safe installations and inspect installations in the field
  • As we strive to achieve the highest levels of efficiency with fuel-fired boilers, furnaces and water heaters the low buoyancy creates challenges in the safe venting of flue gas. This seminar addresses these challenges specifically for sidewall and common venting.
  1. 1. Sidewall Venting of High Efficiency Equipment: How Close is Too Close 
  • Larry Brand, Gas Technology Institute., Davis, CA

High efficiency gas fired furnaces, boilers and water heaters are generally installed with Category IV venting systems – positive pressure and condensing.  In many retrofit cases, especially in multistory systems, the access to the roof for vent termination is not possible – an existing B vent may be installed in the chase or existing chimney and common-venting is not permitted.  A sidewall vent is the only option, but there are restrictions. This presentation reviews the restrictions on sidewall venting in several national and local codes and investigates the potential for ice formation on sidewalls.

  1. 2. Common Venting High Efficiency Equipment
  • Tim McNulty, U.S. Draft Co., Fort Worth, TX

This presentation reviews the practice of common venting condensing or near condensing gas-fired appliances with respect to current ASHRAE guidelines, appliance manufacturers’ recommendations and code requirements. Although national guidelines have been developed for common venting Category I and draft hood-equipped appliances, there is no national standard for common venting condensing or near condensing appliances such as Category II and IV appliances. This presentation focuses on the current chimney design methodology along with the limitations as well as good practices related to common venting Category II and IV appliances.

 

 

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ALL ASHRAE committee meetings, including this TC’s meetings at the Winter and Annual Society conferences, are open to the public at no cost nor is conference registration required. Interested visitors, local chapter members, and potential new TC members are always welcome. However to attend technical program sessions sponsored by the TC will require registration and payment of any applicable fee.

Participation in an ASHRAE TC provides the opportunity to grow professionally and to contribute to the advancement of HVAC&R within an international organization recognized for shaping the future of the built environment through research, standards writing, publishing, and education.