Phase Two Change Proposal for the Next Edition of the Building Code: 2-CC-B POTENTIAL CHANGE TO ONTARIO S BUILDING CODE:

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Wilfrid Godwin Cummings
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1 Phase Two Change Proposal for the Next Edition of the Building Code: 2-CC-B POTENTIAL CHANGE TO ONTARIO S BUILDING CODE: SUMMER AND FALL 2017 CONSULTATION

Ministry of Municipal Affairs PROPOSED CHANGE TO THE 2012 BUILDING CODE O. REG. 332/12 AS AMENDED CHANGE NUMBER: SOURCE: 2-CC-B-09-32-03 Ontario CODE REFERENCE: Div. B, 9.32.3.5.(9) Div. B, 9.32.3.7.

2 Ministry of Municipal Affairs PROPOSED CHANGE TO THE 2012 BUILDING CODE O. REG. 332/12 AS AMENDED CHANGE NUMBER: SOURCE: 2-CC-B Ontario CODE REFERENCE: Div. B, (9) Div. B, (3) Div. B, (4) Div. B, (5) Div. B, (2) Div. B, (4) Div. B, Div. B, (9) Div. B, (1) DESCRIPTION OF THE PROPOSED AMENDMENT The proposed change will allow the use of energy recovery ventilators where a heat recovery ventilator is required or used. EXISTING 2012 BUILDING CODE PROVISION(S) Section Ventilation Mechanical Ventilation (See Appendix A.) Supplemental Exhaust (9) Supplemental exhaust required in this Article may be provided by means of a heat recovery ventilator installed in accordance with Article Ventilation Systems Not Coupled With Forced Air Heating Systems (3) The mechanical system in this Article shall include a heat recovery ventilator installed in accordance with Article (4) Outdoor air shall be distributed by a ductwork system from the heat recovery ventilator required in Sentence (3) to each bedroom, to any storey without a bedroom and, if there is no storey without a bedroom, to the principal living area. Building and Development Branch Page 1 of 6

3 (5) A supply duct from the outdoors to the heat recovery ventilator required in Sentence (3) and a main distribution trunk duct shall be provided and shall be sized according to Part 6, except that the supply duct and the main distribution trunk duct may be sized according to Table A. where, (a) the total duct length from the outdoor hood to any supply register does not exceed 21 m, and (b) the total number of fittings does not exceed 8. Number of Bedrooms in Dwelling Unit Table A. Minimum Outdoor Air Supply and Main Trunk Duct Sizes Forming Part of Sentence (5) Minimum Outdoor Air Supply and Main Distribution Trunk Duct Diameter, mm More than 5 System must comply with Sentence (1) Column Protection Against Depressurization (2) Where a solid fuel-fired combustion appliance is installed, the ventilation system shall include a heat recovery ventilator that is designed to operate so that the flow of exhaust air does not exceed the flow of intake air in any operating mode, and that complies with the requirements of Article Fan Ratings (4) Except for heat recovery ventilators, exhaust fans required to make up any part of the total ventilation capacity required by Article shall have a sound rating not greater than that specified in Table Table Fan Sound Rating Forming Part of Sentence (4) Fan Application Maximum Sound Rating, sones Rated according to CAN/CSA-C260-M Rated according to HVI 915 Principal exhaust fan Supplemental exhaust fans installed in bathrooms and water closet rooms and their make-up air fans Supplemental exhaust fans installed in kitchens and their make-up air fans no rating required no rating required Column Building and Development Branch Page 2 of 6

4 Heat Recovery Ventilators (1) Where a heat recovery ventilator is installed to provide all or part of the requirements of this Subsection, this Article shall apply. (2) Heat recovery ventilators shall be designed to provide a minimum 55% sensible heat recovery efficiency when tested to the low temperature thermal and ventilation performance test method set out in CAN/CSA-C439, Rating the Performance of Heat/Energy-Recovery Ventilators, at a Station 1 test temperature of 25 C at an air flow not less than 30 L/s. (3) Where a heat recovery ventilator is connected to a forced air heating system, the supply side of the ventilator shall be directly connected to the return air side of the forced air heating system. (4) Two or more heat recovery ventilators shall not be connected in parallel air flow to a common air supply duct unless specifically recommended by the manufacturer. (5) Two or more heat recovery ventilators shall not be connected in parallel air flow to a common downstream exhaust duct. (6) Heat recovery ventilators installed in unheated spaces shall be installed so as to avoid condensation of moisture on fans and motors in exhaust air, in accordance with the manufacturer's instructions. (7) All start-up procedures recommended by the manufacturer including air balancing and air-flow determination shall be followed. (8) Free flow of condensate shall be provided in accordance with the manufacturer's recommendations or, in their absence, a condensate drain of minimum ½ inch nominal pipe size pitched in the direction of flow and complete with a trap or condensate pump with sufficient capacity shall be installed. (9) The heat recovery ventilator and all condensate lines shall be installed in a space where the ambient temperature will not adversely affect the operation of the system. (10) When operating at the rate required in Article , the supply and exhaust airflow rates of the heat recovery ventilator shall be balanced so that the value of the lesser flow shall be at least 90% of the value of the greater flow, unless otherwise recommended by the manufacturer Outdoor Intake and Exhaust Openings (9) Except for exhaust outlets serving heat recovery ventilators, exhaust outlets shall incorporate backdraft dampers Installation (1) Installation of fans and heat recovery ventilators shall be in accordance with manufacturer s instructions for minimizing noise and vibration transmission and achieving the required sound rating. Building and Development Branch Page 3 of 6

5 PROPOSED CODE CHANGE Section Ventilation Mechanical Ventilation (See Appendix A.) Supplemental Exhaust (9) Supplemental exhaust required in this Article may be provided by means of a heat or energy recovery ventilator installed in accordance with Article Ventilation Systems Not Coupled With Forced Air Heating Systems (3) The mechanical system in this Article shall include a heat or energy recovery ventilator installed in accordance with Article (4) Outdoor air shall be distributed by a ductwork system from the heat or energy recovery ventilator required in Sentence (3) to each bedroom, to any storey without a bedroom and, if there is no storey without a bedroom, to the principal living area. (5) A supply duct from the outdoors to the heat or energy recovery ventilator required in Sentence (3) and a main distribution trunk duct shall be provided and shall be sized according to Part 6, except that the supply duct and the main distribution trunk duct may be sized according to Table A. where, (a) the total duct length from the outdoor hood to any supply register does not exceed 21 m, and (b) the total number of fittings does not exceed 8. Table A. Minimum Outdoor Air Supply and Main Trunk Duct Sizes Forming Part of Sentence (5) Number of Bedrooms in Dwelling Unit Minimum Outdoor Air Supply and Main Distribution Trunk Duct Diameter, mm More than 5 System must comply with Sentence (1) Column Protection Against Depressurization (2) Where a solid fuel-fired combustion appliance is installed, the ventilation system shall include a heat or energy recovery ventilator that is designed to operate so that the flow of exhaust air does not exceed the flow of intake air in any operating mode, and that complies with the requirements of Article Building and Development Branch Page 4 of 6

6 Fan Ratings (4) Except for heat or energy recovery ventilators, exhaust fans required to make up any part of the total ventilation capacity required by Article shall have a sound rating not greater than that specified in Table Table Fan Sound Rating Forming Part of Sentence (4) Fan Application Maximum Sound Rating, sones Rated according to CAN/CSA-C260-M Rated according to HVI 915 Principal exhaust fan Supplemental exhaust fans installed in bathrooms and water closet rooms and their make-up air fans Supplemental exhaust fans installed in kitchens and their make-up air fans no rating required no rating required Column Heat Recovery Ventilators (1) Where a heat or energy recovery ventilator is installed to provide all or part of the requirements of this Subsection, this Article shall apply. (2) Heat or energy recovery ventilators shall be designed to provide a minimum 55% sensible heat recovery efficiency when tested to the low temperature thermal and ventilation performance test method set out in CAN/CSA-C439, Rating the Performance of Heat/Energy-Recovery Ventilators, at a Station 1 test temperature of 25 C at an air flow not less than 30 L/s. (3) Where a heat or energy recovery ventilator is connected to a forced air heating system, the supply side of the ventilator shall be directly connected to the return air side of the forced air heating system. (4) Two or more heat or energy recovery ventilators shall not be connected in parallel air flow to a common air supply duct unless specifically recommended by the manufacturer. (5) Two or more heat or energy recovery ventilators shall not be connected in parallel air flow to a common downstream exhaust duct. (6) Heat r energy recovery ventilators installed in unheated spaces shall be installed so as to avoid condensation of moisture on fans and motors in exhaust air, in accordance with the manufacturer's instructions. (7) All start-up procedures recommended by the manufacturer including air balancing and air-flow determination shall be followed. (8) Free flow of condensate shall be provided in accordance with the manufacturer's recommendations or, in their absence, a condensate drain of minimum ½ inch nominal pipe size pitched in the direction of flow and complete with a trap or condensate pump with sufficient capacity shall be installed. (9) The heat or energy recovery ventilator and all condensate lines shall be installed in a space where the ambient temperature will not adversely affect the operation of the system. Building and Development Branch Page 5 of 6

7 (10) When operating at the rate required in Article , the supply and exhaust airflow rates of the heat or energy recovery ventilator shall be balanced so that the value of the lesser flow shall be at least 90% of the value of the greater flow, unless otherwise recommended by the manufacturer Outdoor Intake and Exhaust Openings (9) Except for exhaust outlets serving heat or energy recovery ventilators, exhaust outlets shall incorporate backdraft dampers Installation (1) Installation of fans and heat or energy recovery ventilators shall be in accordance with manufacturer s instructions for minimizing noise and vibration transmission and achieving the required sound rating. RATIONALE FOR CHANGE Problem/General Background Currently, various provisions of Part 9 make reference to a heat recovery ventilator. Energy recovery ventilators provide similar benefits as they facilitate recovery of latent energy and moisture. Justification/Explanation The editorial change will clarify that the energy recovery ventilators that meet the same requirements as heat recovery ventilators can be used the meet the Code requirements. Cost/Benefit Implications No additional cost as the proposed change would provide another option. The change would increase design flexibility. Enforcement Implications None expected. Who is Affected Designers (including licensed architects and professional engineers), builders, contractors and installers, product manufacturers and enforcement officials are affected. Objective Based Analysis Not applicable. OTHER SUPPORTING MATERIALS None. Building and Development Branch Page 6 of 6

PROPOSED CHANGE TO THE 2012 BUILDING CODE O. REG. 332/12 AS AMENDED

Ministry of Municipal Affairs PROPOSED CHANGE TO THE 2012 BUILDING CODE O. REG. 332/12 AS AMENDED CHANGE NUMBER: SOURCE: B-03-06-03 Ontario-NBC CODE REFERENCE: Division B / 3.6.4.3. Division B / 9.10.13.14.(1)