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<br />ventilation control. The required flow rate shall be <br />VENTILATION DUCTS: <br />4. IRC Section M1507.3.3, <br />verified by field testing with a flow hood or a flow <br />M1508.5.3, M1508.7.3. All ventilation exhaust ducts <br />measuring station. The whole house ventilation <br />shall be sized in accordance with Table <br />system shall be controlled by a 24-hour clock <br />M1508.6.2 and shall terminate outside the building. <br />timer with the capability of continuous operation, <br />Exhaust ducts shall be equipped with back draft <br />manual and automatic control. This control will <br />dampers and shall be insulated to a minimum of R- <br />control the forced air system blower and the <br />4 where passing through an unconditioned space. <br />automatic damper. The 24-hour timer shall be <br /> <br />readily accessible. The 24-hour timer shall be <br />Table M1508.6.2 <br />capable of operating the whole house ventilation <br />Prescriptive Supply Fan Duct Sizing system without energizing the energy- <br /> <br />consuming appliances. At the time of final <br /> <br />Supply Fan Tested CFM at 0.40” w.g. <br /> <br />inspection, the automatic control timer shall be <br />Specified Minimum Minimum <br /> <br />set to operate the whole house system for at <br />Volume from Smooth Duct Flexible Duct <br /> <br /> least 8 hours a day. A label shall be affixed to the <br />Table 408.1DiameterDiameter <br /> <br />control that reads "Whole House Ventilation (see <br /> <br /> <br />50–90 cfm4 inch5 inch <br /> <br />operating instructions).” <br /> <br />90-150 cfm5 inch6 inch <br /> <br /> <br /> <br />150-250 cfm6 inch7 inch CONDENSATE DISPOSAL AND DRAIN <br />8. <br /> <br /> <br />SYSTEMS: <br />IRC Section M1411.3. <br />250-400 cfm7 inch8 inch <br /> <br /> Condensate from all cooling coils or <br />WINDOW OR WALL PORTS: <br />5. IRC Section <br />evaporators shall be conveyed from the drain <br />M1508.4.5. Outdoor air shall be distributed to <br />pan outlet to an approved place of disposal. <br />each habitable room by individual outdoor air inlets. <br />Condensate shall not discharge into a street, <br />Individual room outdoor air inlets shall have a <br />alley or other areas where it would cause a <br />controllable and secure opening and be capable of <br />nuisance. A secondary drain or auxiliary drain <br />a total opening area of not less than 4 square <br />pan shall be required for each cooling or <br />inches. Outdoor air inlets shall be located so as <br />evaporator coil where damage to any building <br />not to take air from within 10 feet of a plumbing vent <br />components will occur as a rest of overflow <br />opening, or an appliance vent outlet, or where it will <br />equipment drain pan or stoppage in the <br />pick up objectionable odors, fumes or flammable <br />condensate drain piping. Piping shall maintain a <br />vapors. <br />minimum horizontal slope in the direction of <br /> <br />DISTRIBUTION <br />6. : IRC M1508.4.5. Where <br />discharge of not less than 1/8 unit vertical in 12 <br />outdoor air supplies (window or wall ports) are <br />units horizontal (1% slope). <br /> <br />separated from fan locations by doors, adequate air <br />flow shall be ensured by undercutting doors or <br />APPLIANCE ACCESS UNDERFLOOR: <br />9. <br />installing grilles or transoms. Doors shall be <br />Underfloor spaces <br />IRC Section M1305.1.4. <br />undercut to a minimum of ½” above the surface of <br />containing appliances shall be provided <br />the finished floor covering. <br />with an unobstructed passageway large <br /> <br />enough to remove the largest appliance <br />MAKE-UP THROUGH FURNACE: <br />7. IRC <br />but not less than 30” high by 22” wide, <br />M1508.5.1. Integrated forced-air ventilation systems <br />nor more than 20‘ long from the opening to <br />shall distribute outdoor air to each habitable room <br />the appliance. <br />A level service space of at least <br />through the forced-air system ducts. Integrated <br />30” by 30” shall be provided at the front or <br />forced-air ventilation systems shall have an <br />service side of the appliance. See M1305.1.4 <br />outdoor air inlet duct connecting a terminal element <br />for details of mechanical equipment access. <br />on the outside of the building to the return air <br />plenum of the forced-air system, at a point within 4 <br />feet upstream of the air handler. The outdoor air <br />inlet duct connection to the return air stream shall <br />be located upstream of the forced- air system <br />blower and shall not be connected directly into a <br />furnace cabinet to prevent thermal shock to the heat <br />exchanger. The system will be equipped with a <br />motorized damper connected to the automatic <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 19 Tel: (808) 323-4720 <br /> <br />