3714 COLBY AVE 2022-01-27 - Laserfiche WebLink

Individual room outdoor air inlets shall: { 1. Have controllable and secure openings; 2. Be sleeved or otherwise designed so as not to compromise the thermal properties of the wall or window in which they are placed; 3. Any inlet or combination of inlets which provide - - 10 cfmat 10 Pascals are deemed equivalent to 4 square inches net free area. Ventilation opening shall be screened or otherwise protected from entry by leaves or other material. Openings shall be controllable, securable and shall be designed to not compromise the thermal properties of the building; envelope. Ventilation openings shall be located so as not to take air from the following areas: 1. Closer than 10 feet from an appliance vent outlet, unless such vent outlet is 3 feet above the outdoor air inlet. 2. .Where it will pick up objectionable odors, fumes or flammable vapors. 3. A hazardous or unsanitary location. 4. A room or space having any fuel -burning appliances therein. 5. Closer than 10 feet from a vent opening of a plumbing drainage system unless the vent opening is at least 3 feet above the air inlet. 6. Attic, crawl spaces, or garages. 7. Asphalt roofs unless it is shown that no other location is permissible. In such cases the inlet opening shall be located a minimum of 2 feet from the nearest surface of the asphalt roofing, measured from the intake opening. M1507.3.5 Whole -house ventilation integrated with a forced -air system. This section establishes minimum prescriptive requirements for whole -house ventilation systems integrated with forced -air ventilation systems. A system which meets all the requirements of this section shall be deemed to satisfy the requirements for a whole -house ventilation system. M1507.3.5.1 Integrated whole -house ventilation systems. Integrated whole -house ventilation systems shall provide outdoor air at the rate calculated using Section M1507.3.3. Integrated forced -air ventilation systems shall distribute outdoor air to each habitable space through the forced -air system ducts. Integrated forced -air ventilation systems shall have an outdoor air inlet duct connecting a terminal element on the outside of the building to the return air plenum of the forced -air system, at a point within 4 feet upstream of the air handler. The outdoor air inlet duct connection to the return air stream shall be located upstream of the forced - air system blower and shall not be connected directly into a furnace cabinet to prevent thermal shock to the heat exchanger. The system will be equipped with a motorized damper connected to the automatic ventilation control as specified in Section MI507.3.2. The required flow rate shall be verified by field testing with a flow hood or a flow measuring station M1507.3.5.2 Ventilation duct insulation. All supply ducts in the conditioned space shall be insulated to a minimum of R-4. Effective July 1, 2016 WASHINGTON STATE AMENDMENTS M1507.3.5.3 Outdoor air inlets. Inlets shall be screened or otherwise protected from entry by leaves or other material. Outdoor air inlets shall be located so as not to take air from the following areas: 1. Closer than 10 feet from an appliance vent outlet, unless such vent outlet is 3 feet above the outdoor air inlet. 2. Where it will pick up objectionable odors, fumes or flammable vapors. 3. A hazardous or unsanitary location. 4. A room or space having any fuel -burning appliances therein. 5. Closer than 10 feet from a vent opening of a plumbing drainage system unless the vent opening is at least 3 feet above the air inlet. 6. Attic, crawl spaces, or garages. M1507.3.6 Whole -house ventilation using a supply fan. This section establishes minimum prescriptive requirements for whole -house ventilation systems using an inline supply fan. A system which meets all the requirements of this section shall be deemed to satisfy the requirements for a whole -house ventilation system. M1507.3.6.1 Outdoor air. Supply fan ventilation systems shall distribute outdoor air to each habitable space through the forced -air system ducts or through dedicated ducts to each habitable space. Supply fans shall have the capacity to provide the amount of outdoor air specified in Table M1507.3.3(1) at 0.40 inches water gauge as per HVI 916. The outdoor air must be filtered before it is delivered to habitable spaces. The filter may be located at the intake device, in line with the fan, or, in the case of a connection to the return plenum of the air handler, using the furnace filter. An outdoor air inlet shall be connected to either the supply or return air stream. M1507.3.6.2 Ducts. An outdoor air inlet duct connection to the supply air stream shall be located downstream of the forced -air system blower. An outdoor air inlet duct connection to the return air stream shall be located at least 4 feet upstream of the forced -air system blower and its filter. Neither type of duct shall be connected directly into a furnace cabinet to prevent thermal shock to the heat exchanger. The outdoor air inlet duct shall be prescriptively sized in accordance with Table M1507.3.6.2. The terminal element on the outside of the building shall be sized 2 inches in diameter larger than the outdoor air inlet duct. TABLE M1507.3.6.2 PRESCRIPTIVE SUPPLY FAN DUCT SIZING Supply Fan Tested CFM at 0.40" w.g. Specified Minimum Minimum Volume from Smooth Duct Flexible Duct Table Diameter Diameter M1507.3.3(1) 50-90 cfin 4 inch 5 inch 90-150 cfin 5 inch 6 inch 150-120 cfin 6 inch 7 inch 250-400 cfm 7 inch 8 inch (Insert As Page 487b)