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Residential Building Plan Review Guidelines
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<br /> minimum of R-4. Terminal elements shall have <br /> <br />at least the equivalent net free area of the duct <br />HEIGHT OF BUILDING / GRADE PLANE: <br />8. <br />work. Terminal elements for exhaust fan duct <br />IRC Section 202. The building height is the vertical <br />systems shall be screened or otherwise <br />distance from grade plane to the average height <br />protected from entry by leaves or other <br />of the highest roof surface. The grade plane is a <br />material. All fans shall provide the required <br />reference plane representing the average of the <br />flow when tested at 0.25 water gauge. Fans <br />finished ground level adjoining the building at all <br />larger than the prescriptive sizes may be <br />exterior walls. Where the finished ground level <br />necessary to attain the required flow. <br />slopes away from the exterior walls, (which is <br />Table M1507.3 Minimum Required Exhaust <br />required) then the reference plane shall be <br />Rates <br />established by the lowest points within the area <br /> <br />between the building and the lot line, or, 6’ from the <br />Laundry rooms <br /> <br /> <br />Kitchens <br /> <br /> <br />or Bathrooms <br />building, whichever is less. See Chapter 25 of the <br /> <br />Intermittently <br /> <br />Hawai‘i County Code for height restrictions and <br />50 cfm100 cfm <br /> <br /> <br />Operating <br /> <br />measurement of height for certain areas or zones <br />Continuous <br /> <br /> <br /> <br />20 cfm25 cfm <br />(Zoning Code). <br /> <br />Operation <br /> <br /> <br /> <br />RETAINING WALLS: <br />9. IBC 1806.1, IRC R105.2, <br />WHOLE HOUSE FAN: <br />2. IRC Section M1508. <br />R404. Retaining walls that are not laterally <br />Each dwelling unit shall be equipped with a <br />supported at the top and that retain more than 24” <br />whole house ventilation system, which shall be <br />of unbalanced fill shall be designed to ensure <br />capable of providing the volume of outdoor air <br />stability against overturning, sliding, excessive <br />specified in Table M1508.2. Fans located 4 <br />foundation pressure and water uplift. Retaining <br />feet or less from the interior grill shall have a <br />walls shall be designed for a safety factor of 1.5 <br />sone rating of 1.5 or less measured at 0.10” <br />against lateral sliding and overturning. Retaining <br />water gauge. <br /> <br />walls that do not exceed 4’ in height, measured from <br /> <br />the bottom of the footing to the top of the wall, and <br />Table M1508.2 Minimum Ventilation Rates: <br />that do not support a surcharge (load above) are <br />(Continuously Operated Systems) (cfm) <br />exempt from permit requirements, but must still be <br /> <br /> <br />Number of Bedrooms <br />2 <br /> <br />Floor Area (ft) <br />constructed properly and must conform with the <br /> <br /> <br />0-12-34-56-7>7 <br />County of Hawai‘i Zoning Code Setback <br /> <br /> <br /><15003045607590 <br />requirements. A separate permit is required for <br /> <br /> <br />1501 – 300045607590105 <br />construction of a retaining wall. <br /> <br /> <br />3001 – 4500607590105120 <br /> <br /> <br /> <br />4501 – 60007590105120135 <br />MECHANICAL <br /> <br /> <br />6001 – 750090105120135150 <br /> <br /> <br /> >7500105120135150165 <br /> <br /> <br /> <br />EXHAUST FANS <br />1. : IRC Section M1507: Source <br />WHOLE HOUSE VENTILATION <br />3. <br />specific exhaust ventilation is required in each <br />SYSTEM CONTROLS: <br /> IRC Section M1508. All <br />kitchen, bathroom, water closet, laundry room, <br />ventilation system controls shall be readily <br />indoor swimming pool, spa, and other rooms <br />accessible. Intermittently operated systems <br />where water vapor or cooking odor is produced. <br />shall have a manual control, as well as an <br />The minimum source specific ventilation effective <br />automatic control, such as a clock timer. The <br />exhaust capacity shall not be less than levels <br />automatic control timer shall be set to operate <br />M1507.3 <br />specified in Table . Source specific <br />the whole house fan system for at least 8 <br />ventilation systems shall be controlled by manual <br />hours a day. A label shall be affixed to the <br />switches, dehumidistats, timers, or other approved <br />control that reads “Whole House Ventilation <br />means. Source specific ventilation system controls <br />(See Operating Instructions).” The installer shall <br />shall be readily accessible. Source specific <br />provide the whole house ventilation system <br />ventilation ducts shall terminate outside the <br />manufacturer’s operation description and <br />building. Exhaust ducts shall be equipped with <br />operating instructions. <br />back-draft dampers. All exhaust ducts in <br />unconditioned spaces shall be insulated to a <br />The County of Hawai‘i is an Equal Opportunity Provider and Employer <br /> <br /> <br />101 Pauahi Street, Suite 107 74-5044 Ane Keohoklole Hwy <br />ā <br />Hilo, Hawai‘i 96720 Kailua-Kona, Hawai’i 96740 <br /> <br />Tel: (808) 961-8331 Page 18 Tel: (808) 323-4720 <br /> <br />
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