have a maximum 1.0 sone per HVI Standard 915 for surface mounted fans Ĥ. be designed and certified by the equipment manufacturer as capable of continuous operation at the rated cfm ģ. meet the minimum continuous ventilation rate in Section N1104.2.1 at the point of discharge Ģ. Fans used to comply with the continuous ventilation part of the mechanical ventilation system shall:ġ. The mechanical ventilation system shall be one of three types: exhaust according to Section N1104.3.1 balanced, and HRV/ERV according to Section N1104.3.2 or other method according to Section N1104.3.3.
or there are more than 6 bedrooms, use Equation 11-1 from Section N1104.2 to calculate total ventilation rate. Total and Continuous Ventilation Rates (in cfm)ġ Conditioned space includes the basement.Ģ If conditioned space exceeds 6000 sq.
The difference between the total ventilation rate and the continuous ventilation rate shall be based on flow rates as designed or as installed. The continuous ventilation system shall be balanced in accordance with Section N1104.4.2.Įxception: If the local ventilation requirements according to IRC Section R303.3 are being met by the continuous ventilation system, it shall be capable of operating at a rate not more than 100 percent greater than required by Section N1104.2.1. The portion of the mechanical ventilation system that is intended to be continuous may have automatic cycling controls providing the average flow rate for each hour meeting the requirements of Section N1104.2.1. A minimum of 50 percent of the total ventilation rate, but not less than 40 cfm, shall be provided, on a continuous rate average for each one-hour period according to Table N1104.2 or Equation 11-2. (0.02 x square feet of conditioned space) + For heat recovery ventilators and energy recovery ventilators the average hourly ventilation capacity must be determined in consideration of any reduction of exhaust or outdoor air intake, or both, for defrost or other equipment cycling per HVI Standard 920. The mechanical ventilation system shall provide sufficient outdoor air to equal the total ventilation rate average, for each one-hour period according to Table N1104.2, or Equation 11-1, based on the number of bedrooms and the square footage of conditioned space, including the basement but excluding conditioned crawl spaces. Additions or alterations to existing buildings shall require a dwelling unit mechanical ventilation system that meets Section N1104.Įxception: Buildings whose permit of initial construction was applied for prior to April 15, 2000, and did not require a dwelling unit mechanical ventilation system. N1104.1.1 Additions or alterations to existing buildings. The supply and return ducts shall be separated by one-half the diagonal dimension of the basement to avoid a short circuit of the air circulation.Įxception: Kitchen and bath fans that are not included as part of the mechanical ventilation system are exempt from the requirements of Section N1104 but shall comply with the IRC. All unfinished basements, crawlspaces, and levels shall be provided with a minimum ventilation rate of 0.02 cfm per square foot, or a minimum of one supply duct and one return duct. This section covers the continuous and total mechanical ventilation requirements for dwelling unit ventilation at summer and winter climatic design conditions according to Section N1104.4.13 and chapter 1346. A mechanical ventilation system shall be installed that meets the requirements of this section. N1104.1 Mechanical ventilation requirements. IRC Chapter 11 is amended by adding a section to read as follows: 1322.1104 IRC SECTION N1104, MECHANICAL VENTILATION SYSTEMS.
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