Ducting
No Returns in a mechanical room or within 10' of a natural draft appliance
Exceptions: Taking return air from a kitchen is not prohibited where such return air openings serve the kitchen and are located not less than 10 feet (3048 mm) from the cooking appliances. Dedicated forced air systems serving only the garage shall not be prohibited from obtaining return air from the garage.
https://up.codes/viewer/ohio/imc-2015/chapter/6/duct-systems#601.5
Plumbing
Saddle Valve valves are prohibited connections -
605.9 Prohibited Joints and Connections
The following types of joints and connections shall be prohibited:
https://up.codes/viewer/ohio/ipc-2015/chapter/6/water-supply-and-distribution#605.9
Pressure reducing valves (PRV) are required when the incoming water pressure is >80psi -
604.8 Water Pressure-Reducing Valve or Regulator
Where water pressure within a building exceeds 80 psi (552 kPa) static, an approved water pressure-reducing valve conforming to ASSE 1003 or CSA B356 with strainer shall be installed to reduce the pressure in the building water distribution piping to not greater than 80 psi (552 kPa) static.
Exception: Service lines to sill cocks and outside hydrants, and main supply risers where pressure from the mains is reduced to 80 psi (552 kPa) or less at individual fixtures.
https://up.codes/viewer/ohio/ipc-2015/chapter/6/water-supply-and-distribution#604.8
Expansion tank are required with a PRV or a closed loop system (check valve) -
607.3 Thermal Expansion Control
Where a storage water heater is supplied with cold water that passes through a check valve, pressure reducing valve or backflow preventer, a thermal expansion tank shall be connected to the water heater cold water supply pipe at a point that is downstream of all check valves, pressure reducing valves and backflow preventers. Thermal expansion tanks shall be sized in accordance with the tank manufacturer's instructions and shall be sized such that the pressure in the water distribution system shall not exceed that required by Section 604.8.
https://up.codes/viewer/ohio/ipc-2015/chapter/6/water-supply-and-distribution#607.3
Auxiliary drain pans are required when a leaking water heater will cause property damage-
504.7 Required Pan
Where a storage tank-type water heater or a hot water storage tank is installed in a location where water leakage from the tank will cause damage, the tank shall be installed in a galvanized steel pan having a material thickness of not less than 0.0236 inch (0.6010 mm) (No. 24 gage), or other pans approved for such use.
https://up.codes/viewer/ohio/ipc-2015/chapter/5/water-heaters#504.7
Building structure
Air Leakage rate / Air Sealing --New buildings are to be sealed up to achieve 3 air changes per hour at 50 pascals or less
R402.4.1.3 Leakage Rate
When complying with Section R401.2.1, the building or dwelling unit shall have an air leakage rate not exceeding 5.0 air changes per hour in Climate Zones 0, 1 and 2, and 3.0 air changes per hour in Climate Zones 3 through 8, when tested in accordance with Section R402.4.1.2.
https://up.codes/viewer/ohio/iecc-2021/chapter/RE_4/re-residential-energy-efficiency#R402.4.1.3
Mechanical ventilation is required when the home is tighter than 5 air changes per hour at 50 pascals
401.2 Ventilation Required
Every occupied space shall be ventilated by natural means in accordance with Section 402 or by mechanical means in accordance with Section 403. When a blower door test is required by the applicable energy conservation code referenced from Chapter 13 of the building code, or when a blower door test is otherwise performed, and where the air infiltration rate in a dwelling unit is less than 5 air changes per hour when tested with a blower door at a pressure of 0.2-inch water column (50 Pa), the dwelling unit shall be ventilated by mechanical means in accordance with Section 403. Ambulatory care facilities and Group I-2 occupancies shall be ventilated by mechanical means in accordance with Section 407.
https://up.codes/viewer/ohio/imc-2015/chapter/4/ventilation#401.2
Duct Leakage
R403.3.6 Duct Leakage
The total leakage of the ducts, where measured in accordance with Section R403.3.5, shall be as follows:
https://up.codes/viewer/ohio/iecc-2021/chapter/RE_4/re-residential-energy-efficiency#R403.3.6
Exhaust / Venting
1501.1 All exhaust vents, including bath fans, need to be vented directly to the outdoors
1501.1 Outdoor Discharge
The air removed by every mechanical exhaust system shall be discharged to the outdoors in accordance with Section 1504.3. Air shall not be exhausted into an attic, soffit, ridge vent or crawl space.
https://up.codes/viewer/ohio/irc-2018/chapter/15/exhaust-systems#M1501.1
801.16 Masonry chimneys need to be lined
801.16 Flue Lining
Masonry chimneys shall be lined. The lining material shall be compatible with the type of appliance connected, in accordance with the appliance listing and manufacturer's installation instructions. Listed materials used as flue linings shall be installed in accordance with their listings and the manufacturer's instructions.
https://up.codes/viewer/ohio/imc-2015/chapter/8/chimneys-and-vents#801.16
801.8 Masonry chimney's need to be lined when an appliance is replaced (enforced with the furnace replacement, not as frequently with the water heater)
801.18 Existing Chimneys and Vents
Where an appliance is permanently disconnected from an existing chimney or vent, or where an appliance is connected to an existing chimney or vent during the process of a new installation, the chimney or vent shall comply with Sections 801.18.1 through 801.18.4.
801.18.1 Size
The chimney or vent shall be resized as necessary to control flue gas condensation in the interior of the chimney or vent and to provide the appliance or appliances served with the required draft. For the venting of oil-fired appliances to masonry chimneys, the resizing shall be in accordance with NFPA 31.
801.18.2 Flue Passageways
The flue gas passageway shall be free of obstructions and combustible deposits and shall be cleaned if previously used for venting a solid or liquid fuel-burning appliance or fireplace. The flue liner, chimney inner wall or vent inner wall shall be continuous and shall be free of cracks, gaps, perforations or other damage or deterioration which would allow the escape of combustion products, including gases, moisture and creosote. Where an oil-fired appliance is connected to an existing masonry chimney, such chimney flue shall be repaired or relined in accordance with NFPA 31.
up.codes/viewer/ohio/imc-2015/chapter/8/chimneys-and-vents#801.18
801.19 You can not tie appliances from more than one floor to the same flue
801.19 Multistory Prohibited
Common venting systems for appliances located on more than one floor level shall be prohibited, except where all of the appliances served by the common vent are located in rooms or spaces that are accessed only from the outdoors. The appliance enclosures shall not communicate with the occupiable areas of the building.
https://up.codes/viewer/ohio/imc-2015/chapter/8/chimneys-and-vents#801.19
304.5.1 Appliances that draw combustion air from the living space require a minimum of 50 cu/ft per 1000k btu
304.5 Indoor Combustion Air
The required volume of indoor air shall be determined in accordance with Section 304.5.1 or 304.5.2, except that where the air infiltration rate is known to be less than 0.40 air changes per hour (ACH), Section 304.5.2 shall be used. The total required volume shall be the sum of the required volume calculated for all appliances located within the space. Rooms communicating directly with the space in which the appliances are installed through openings not furnished with doors, and through combustion air openings sized and located in accordance with Section 304.5.3, are considered to be part of the required volume.
304.5.1 Standard Method
The minimum required volume shall be 50 cubic feet per 1,000 Btu/h (4.8 m3/kW) of the appliance input rating.
up.codes/viewer/ohio/ifgc-2015/chapter/3/general-regulations#304.5.1
Makeup Air Required
Automated Make up air is required with any range hood >400cfm
Exhaust hood systems capable of exhausting in excess of 400 cfm (0.19 m3/s) shall be provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system.
https://up.codes/viewer/ohio/imc-2015/chapter/5/exhaust-systems#505.2
Electrical
Air Conditioner wire sizing by MCA (maximum current ampacity)
440.6 Ampacity and Rating
The size of conductors for equipment covered by this article shall be selected from Table 310.15(B)(16) through Table 310.15(B)(19) or calculated in accordance with 310.15 as applicable. The required ampacity of conductors and rating of equipment shall be determined according to 440.6(A) and 440.6(B).
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Open options(A) Hermetic Refrigerant Motor-Compressor
For a hermetic refrigerant motor-compressor, the rated-load current marked on the nameplate of the equipment in which the motor-compressor is employed shall be used in determining the rating or ampacity of the disconnecting means, the branch-circuit conductors, the controller, the branch-circuit short-circuit and ground-fault protection, and the separate motor overload protection. Where no rated-load current is shown on the equipment nameplate, the rated-load current shown on the compressor nameplate shall be used.
Exception No. 1: Where so marked, the branch-circuit selection current shall be used instead of the rated-load current to determine the rating or ampacity of the disconnecting means, the branch-circuit conductors, the controller, and the branch-circuit short-circuit and ground-fault protection.
Exception No. 2: For cord-and-plug-connected equipment, the nameplate marking shall be used in accordance with 440.22(B), Exception No. 2.(B) Multimotor Equipment
For multimotor equipment employing a shaded-pole or permanent split-capacitor-type fan or blower motor, the full-load current for such motor marked on the nameplate of the equipment in which the fan or blower motor is employed shall be used instead of the horsepower rating to determine the ampacity or rating of the disconnecting means, the branch-circuit conductors, the controller, the branch-circuit short-circuit and ground-fault protection, and the separate overload protection. This marking on the equipment nameplate shall not be less than the current marked on the fan or blower motor nameplate.
https://up.codes/viewer/ohio/nfpa-70-2017/chapter/4/equipment-for-general-use#440.6R402.4.1.3 Leakage Rate
No Returns in a mechanical room or within 10' of a natural draft appliance
- 601.5 Return Air Openings
Return air openings for heating, ventilation and air-conditioning systems shall comply with all of the following: - Openings shall not be located less than 10 feet (3048 mm) measured in any direction from an open combustion chamber or draft hood of another appliance located in the same room or space.
- Return air shall not be taken from a hazardous or insanitary location or a refrigeration room as defined in this code.
- The amount of return air taken from any room or space shall be not greater than the flow rate of supply air delivered to such room or space.
- Return and transfer openings shall be sized in accordance with the appliance or equipment manufacturer's installation instructions, ACCA Manual D or the design of the registered design professional.
- Return air taken from one dwelling unit shall not be discharged into another dwelling unit.
- Taking return air from a crawl space shall not be accomplished through a direct connection to the return side of a forced air furnace. Transfer openings in the crawl space enclosure shall not be prohibited.
- Return air shall not be taken from a closet, bathroom, toilet room, kitchen, garage, boiler room, furnace room or unconditioned attic.
Exceptions: Taking return air from a kitchen is not prohibited where such return air openings serve the kitchen and are located not less than 10 feet (3048 mm) from the cooking appliances. Dedicated forced air systems serving only the garage shall not be prohibited from obtaining return air from the garage.
https://up.codes/viewer/ohio/imc-2015/chapter/6/duct-systems#601.5
Plumbing
Saddle Valve valves are prohibited connections -
605.9 Prohibited Joints and Connections
The following types of joints and connections shall be prohibited:
- Cement or concrete joints.
- Joints made with fittings not approved for the specific installation.
- Solvent-cement joints between different types of plastic pipe.
- Saddle-type fittings.
https://up.codes/viewer/ohio/ipc-2015/chapter/6/water-supply-and-distribution#605.9
Pressure reducing valves (PRV) are required when the incoming water pressure is >80psi -
604.8 Water Pressure-Reducing Valve or Regulator
Where water pressure within a building exceeds 80 psi (552 kPa) static, an approved water pressure-reducing valve conforming to ASSE 1003 or CSA B356 with strainer shall be installed to reduce the pressure in the building water distribution piping to not greater than 80 psi (552 kPa) static.
Exception: Service lines to sill cocks and outside hydrants, and main supply risers where pressure from the mains is reduced to 80 psi (552 kPa) or less at individual fixtures.
https://up.codes/viewer/ohio/ipc-2015/chapter/6/water-supply-and-distribution#604.8
Expansion tank are required with a PRV or a closed loop system (check valve) -
607.3 Thermal Expansion Control
Where a storage water heater is supplied with cold water that passes through a check valve, pressure reducing valve or backflow preventer, a thermal expansion tank shall be connected to the water heater cold water supply pipe at a point that is downstream of all check valves, pressure reducing valves and backflow preventers. Thermal expansion tanks shall be sized in accordance with the tank manufacturer's instructions and shall be sized such that the pressure in the water distribution system shall not exceed that required by Section 604.8.
https://up.codes/viewer/ohio/ipc-2015/chapter/6/water-supply-and-distribution#607.3
Auxiliary drain pans are required when a leaking water heater will cause property damage-
504.7 Required Pan
Where a storage tank-type water heater or a hot water storage tank is installed in a location where water leakage from the tank will cause damage, the tank shall be installed in a galvanized steel pan having a material thickness of not less than 0.0236 inch (0.6010 mm) (No. 24 gage), or other pans approved for such use.
https://up.codes/viewer/ohio/ipc-2015/chapter/5/water-heaters#504.7
Building structure
Air Leakage rate / Air Sealing --New buildings are to be sealed up to achieve 3 air changes per hour at 50 pascals or less
R402.4.1.3 Leakage Rate
When complying with Section R401.2.1, the building or dwelling unit shall have an air leakage rate not exceeding 5.0 air changes per hour in Climate Zones 0, 1 and 2, and 3.0 air changes per hour in Climate Zones 3 through 8, when tested in accordance with Section R402.4.1.2.
https://up.codes/viewer/ohio/iecc-2021/chapter/RE_4/re-residential-energy-efficiency#R402.4.1.3
Mechanical ventilation is required when the home is tighter than 5 air changes per hour at 50 pascals
401.2 Ventilation Required
Every occupied space shall be ventilated by natural means in accordance with Section 402 or by mechanical means in accordance with Section 403. When a blower door test is required by the applicable energy conservation code referenced from Chapter 13 of the building code, or when a blower door test is otherwise performed, and where the air infiltration rate in a dwelling unit is less than 5 air changes per hour when tested with a blower door at a pressure of 0.2-inch water column (50 Pa), the dwelling unit shall be ventilated by mechanical means in accordance with Section 403. Ambulatory care facilities and Group I-2 occupancies shall be ventilated by mechanical means in accordance with Section 407.
https://up.codes/viewer/ohio/imc-2015/chapter/4/ventilation#401.2
Duct Leakage
R403.3.6 Duct Leakage
The total leakage of the ducts, where measured in accordance with Section R403.3.5, shall be as follows:
- Rough-in test: The total leakage shall be less than or equal to 4.0 cubic feet per minute (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area where the air handler is installed at the time of the test. Where the air handler is not installed at the time of the test, the total leakage shall be less than or equal to 3.0 cubic feet per minute (85 L/min) per 100 square feet (9.29 m2) of conditioned floor area.
- Postconstruction test: Total leakage shall be less than or equal to 4.0 cubic feet per minute (113.3 L/min) per 100 square feet (9.29 m2) of conditioned floor area.
- Test for ducts within thermal envelope: Where all ducts and air handlers are located entirely within the building thermal envelope, total leakage shall be less than or equal to 8.0 cubic feet per minute (226.6 L/min) per 100 square feet (9.29 m2) of conditioned floor area.
https://up.codes/viewer/ohio/iecc-2021/chapter/RE_4/re-residential-energy-efficiency#R403.3.6
Exhaust / Venting
1501.1 All exhaust vents, including bath fans, need to be vented directly to the outdoors
1501.1 Outdoor Discharge
The air removed by every mechanical exhaust system shall be discharged to the outdoors in accordance with Section 1504.3. Air shall not be exhausted into an attic, soffit, ridge vent or crawl space.
https://up.codes/viewer/ohio/irc-2018/chapter/15/exhaust-systems#M1501.1
801.16 Masonry chimneys need to be lined
801.16 Flue Lining
Masonry chimneys shall be lined. The lining material shall be compatible with the type of appliance connected, in accordance with the appliance listing and manufacturer's installation instructions. Listed materials used as flue linings shall be installed in accordance with their listings and the manufacturer's instructions.
https://up.codes/viewer/ohio/imc-2015/chapter/8/chimneys-and-vents#801.16
801.8 Masonry chimney's need to be lined when an appliance is replaced (enforced with the furnace replacement, not as frequently with the water heater)
801.18 Existing Chimneys and Vents
Where an appliance is permanently disconnected from an existing chimney or vent, or where an appliance is connected to an existing chimney or vent during the process of a new installation, the chimney or vent shall comply with Sections 801.18.1 through 801.18.4.
801.18.1 Size
The chimney or vent shall be resized as necessary to control flue gas condensation in the interior of the chimney or vent and to provide the appliance or appliances served with the required draft. For the venting of oil-fired appliances to masonry chimneys, the resizing shall be in accordance with NFPA 31.
801.18.2 Flue Passageways
The flue gas passageway shall be free of obstructions and combustible deposits and shall be cleaned if previously used for venting a solid or liquid fuel-burning appliance or fireplace. The flue liner, chimney inner wall or vent inner wall shall be continuous and shall be free of cracks, gaps, perforations or other damage or deterioration which would allow the escape of combustion products, including gases, moisture and creosote. Where an oil-fired appliance is connected to an existing masonry chimney, such chimney flue shall be repaired or relined in accordance with NFPA 31.
up.codes/viewer/ohio/imc-2015/chapter/8/chimneys-and-vents#801.18
801.19 You can not tie appliances from more than one floor to the same flue
801.19 Multistory Prohibited
Common venting systems for appliances located on more than one floor level shall be prohibited, except where all of the appliances served by the common vent are located in rooms or spaces that are accessed only from the outdoors. The appliance enclosures shall not communicate with the occupiable areas of the building.
https://up.codes/viewer/ohio/imc-2015/chapter/8/chimneys-and-vents#801.19
304.5.1 Appliances that draw combustion air from the living space require a minimum of 50 cu/ft per 1000k btu
304.5 Indoor Combustion Air
The required volume of indoor air shall be determined in accordance with Section 304.5.1 or 304.5.2, except that where the air infiltration rate is known to be less than 0.40 air changes per hour (ACH), Section 304.5.2 shall be used. The total required volume shall be the sum of the required volume calculated for all appliances located within the space. Rooms communicating directly with the space in which the appliances are installed through openings not furnished with doors, and through combustion air openings sized and located in accordance with Section 304.5.3, are considered to be part of the required volume.
304.5.1 Standard Method
The minimum required volume shall be 50 cubic feet per 1,000 Btu/h (4.8 m3/kW) of the appliance input rating.
up.codes/viewer/ohio/ifgc-2015/chapter/3/general-regulations#304.5.1
Makeup Air Required
Automated Make up air is required with any range hood >400cfm
Exhaust hood systems capable of exhausting in excess of 400 cfm (0.19 m3/s) shall be provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system.
https://up.codes/viewer/ohio/imc-2015/chapter/5/exhaust-systems#505.2
Electrical
Air Conditioner wire sizing by MCA (maximum current ampacity)
440.6 Ampacity and Rating
The size of conductors for equipment covered by this article shall be selected from Table 310.15(B)(16) through Table 310.15(B)(19) or calculated in accordance with 310.15 as applicable. The required ampacity of conductors and rating of equipment shall be determined according to 440.6(A) and 440.6(B).
Share
Compare
Open options(A) Hermetic Refrigerant Motor-Compressor
For a hermetic refrigerant motor-compressor, the rated-load current marked on the nameplate of the equipment in which the motor-compressor is employed shall be used in determining the rating or ampacity of the disconnecting means, the branch-circuit conductors, the controller, the branch-circuit short-circuit and ground-fault protection, and the separate motor overload protection. Where no rated-load current is shown on the equipment nameplate, the rated-load current shown on the compressor nameplate shall be used.
Exception No. 1: Where so marked, the branch-circuit selection current shall be used instead of the rated-load current to determine the rating or ampacity of the disconnecting means, the branch-circuit conductors, the controller, and the branch-circuit short-circuit and ground-fault protection.
Exception No. 2: For cord-and-plug-connected equipment, the nameplate marking shall be used in accordance with 440.22(B), Exception No. 2.(B) Multimotor Equipment
For multimotor equipment employing a shaded-pole or permanent split-capacitor-type fan or blower motor, the full-load current for such motor marked on the nameplate of the equipment in which the fan or blower motor is employed shall be used instead of the horsepower rating to determine the ampacity or rating of the disconnecting means, the branch-circuit conductors, the controller, the branch-circuit short-circuit and ground-fault protection, and the separate overload protection. This marking on the equipment nameplate shall not be less than the current marked on the fan or blower motor nameplate.
https://up.codes/viewer/ohio/nfpa-70-2017/chapter/4/equipment-for-general-use#440.6R402.4.1.3 Leakage Rate
