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I/V i ,Lbofv V/ 4I7G4-00N .^ IC11507.3.4 Whole-house ventilation using exhaust fans. M1507.3.2 Control and operation. This section establishes minimum prescriptive requirements I. Location of controls.Controls for all ventilation for whole-house ventilation systems using exhaust fans.A systems shall be readily accessible by the occupant. system which meets all the requirements of this section shall 2. Instructions.Operating instructions for whole house be deemed to satisfy the requirements for a whole-house ventilation systems shall be provided to the occupant ventilation system. by the installer of the system. M1507.3.4.1 Whole-house ventilation fans.Exhaust 3, Local exhaust systems.Local exhaust systems shall fans providing whole-house ventilation shall have a flow be controlled by manual switches,dehumidistats rating at 0.25 inches water gauge as specified in Table timers,or other approved means 4. Continuous whole-house ventilation systems. M1507.3.3(1).Manufacturers'fan flow ratings shall be 'Continuous whole-house ventilation systems shall determined according to HVI 916 or AMCA 210. M1507.3.42 Fan noise.Whole-house fans located 4 feet operate continuously and be equipped with an override control.A"fan on"switch shall be permitted or less from the interior grille shall have a sone rating of as an override control.Controls shall be capable of 1.0 or less measured at 0.1 inches water gauge. Manufacturer's noise ratings shall be determined as per operating the ventilation system without energizingHVI other energy-consuming appliances.A clearly visible 915(March 2009).Remotely mounted fans shall be acoustically isolated from the structural elements of the label shall be affixed to the controls that reads "Whole House Ventilation(see operating building and from attached duct work using insulated instructions)." flexible duct or other approved material. M1507.3.4.3 Fan controls.The whole-house ventilation 5. Intermittent whole house ventilation systems. fan shall meet the requirements of Section M1507.3.2 and Intermittent whole-house ventilation systems shall comply with the following: M1507.3.2.1. 5.1. They shall be capable of operating M1507.3.4.4 Ventilation openings.Each habitable space intermittently and continuously. shall be provided with outdoor air inlets or operable 5.2. They shall have controls capable of operating windows with an openable area not less than 4 square the exhaust fans,forced-air system fans,or inches of net free area of opening for each 10 cfm of supply fans without energizing other energy- outdoor air required by Table M1507.3.3(1).Where consuming appliances.5.3 outdoor air supplies are separated from exhaust points by 5.3. The system shall be designed so that it can doors,provisions shall be made to ensure air flow by operate automatically based on the type of - installation of distribution ducts,undercutting doors, control timer installed. installation of grilles,transoms,or similar means.Doors 5.4. The intermittent mechanical ventilation system shall be undercut to a minimum of 1/2 inch above the , shall operate at least one hour out of every surface of the finish floor covering. four. • 5.5. The system shall have a manual control and Individual room outdoor air inlets shall: automatic control,such as a 24-hour clock 1. Have controllable and secure openings; timer. 2. Be sleeved or otherwise designed so as not to compromise the thermal properties of the wall or 5.6. . window in which they are placed; 5.7. At the time of final inspection,the automatic 3. Any inlet or combination of inlets which provide control shall be set to operate the whole-house 10 cfm at 10 Pascals are deemed equivalent to 4 fan according to the schedule used to calculate square inches net free area. the whole-house fan sizing. Ventilation opening shall be screened or otherwise 5.8. A label shall be affixed to the control that reads protected from entry by leaves or other material. "Whole House Ventilation(see operating Openings shall be controllable,securable and shall be instructions)." designed to not compromise the thermal properties of the M1507.3.2.1 Operating instructions.Installers shall building envelope.Ventilation openings shall be located provide the manufacturer's installation,operating so as not to take air from the following areas: instructions,and e whole house ventilation system 1. Closer than 10 feet from an appliance vent outlet, operation description unless such vent outlet is 3 feet above the outdoor air M1507.3.3 Mechanical ventilation rate.The whole- inlet. house mechanical ventilation system shall provide 2. .Where will prkup objectionable odors,fumes or outdoor air to each dwelling unit at a continuous rate of flammablu vapors. not less than that determined in accordance with.Table 3. A hazardous or unsanitary location. M1507.3.3(1), 4. A room or space having any fuel-burning appliances therein. Exception:The whole-house mechanical ventilation 5. Closer than 10 feet from a vent opening of a system is permitted to operate intermittently where the plumbing drainage system unless the vent opening is system has controls that enable operation for not less at least 3 feet above the air inlet. than 25 percent of each 4-hour segment and the 6. Attic,crawl spaces,or garages. ventilation rate prescribed in Table M1507.3.3(1)is 7. Asphalt roofs unless it is shown that no other location multiplied by the factor determined in accordance with is permissible.In such cases the inlet opening shall Table M1507.3.3(2). be located a minimum of 2 feet from the nearest surface of the asphalt roofing,measured from the - intake opening. (#• 12