Heating, Ventilating and Air-Conditioning

(1)Except as provided in Sentence (2), and except as otherwise provided in this Section, systems and equipment for heating, ventilating and air-conditioning services in farm buildings shall conform to Part 6.

(2)Farm buildings need not comply with Articles 6.3.1.3. and 6.4.1.1. and Sentences 6.3.2.8.(3) and 6.3.2.10.(13).

(1)The fee on a request for a ruling under clause 29(1)(a) of the Act is $697, for 2025 and subsequent calendar years.

(1)Except as provided in Sentence (2), the rates at which outdoor air is supplied in farm buildings by ventilation systems shall be in accordance with good engineering practice as described in Article 6.2.1.1.

(2)Except as otherwise provided in this Subsection, farm buildings containing a Group G, Division 4 major occupancy need not comply with Sentence (1).

(1)Except as provided in Sentence (2), where a fuel-fired appliance is installed in a farm building containing a Group G, Division 3 major occupancy, separate combustion air and flue systems shall be provided.

(2)Sentence (1) need not apply where the fuel-fired appliance

• (a) is specifically designed as a generator of carbon dioxide for enrichment of the atmosphere in the farm building, and
• (b) conforms to CSA B149.1, "Natural gas and propane installation code."

(1)This Article applies to controlled-atmosphere storage areas that, during storage periods, contain an atmosphere with an oxygen content less than 19.5% or more than 23% by volume.

(2)During storage periods, controlled-atmosphere storage areas need not comply with Sentence 2.4.2.1.(1).

(3)Prior to a controlled-atmosphere storage area being accessed after a storage period and while the storage area is accessible between storage periods, the ventilation system of the storage area shall

• (a) supply outdoor air to the storage area at a rate in accordance with Sentence 2.4.2.1.(1), and
• (b) ensure that the atmosphere in the storage area has an oxygen content not less than 19.5% and not more than 23% by volume.

(4)A warning sign shall be provided at each entrance to a controlled-atmosphere storage area in accordance with Sentence 2.14.2.1.(5) of Division B of the NRCC-CONST-56437E 2020, "National Fire Code of Canada."

(1)Where an enclosed tower silo, horizontal silo, or grain storage bin is connected to an adjacent feed room, mechanical exhaust ventilation shall be provided to remove air from the lowest floor level of the feed room to the outdoors at a rate not less than 3 air changes per hour.

(2)The ventilation system of the farm building in which the feed room referred to in Sentence (1) is located shall be designed to prevent airflow from the feed room to any other part of the floor area of the farm building.

(3)Enclosed horizontal silos shall be ventilated by

• (a) openings at roof or eave level with an area not less than 1% of the floor area of the silo that consist of (i) a continuous ridge opening, (ii) openings in both gable ends, or (iii) openings in the eaves on each side of the roof, and
• (b) openings at floor level with an area not less than 1% of the floor area of the silo.

(1)Farm buildings housing livestock with below-floor storage of liquid manure shall be provided with a ventilation system that supplies outdoor air at a rate that is

• (a) sufficient to limit the concentrations of dangerous goods classified as flammable gases to not more than 25% of their lower explosive limit,
• (b) sufficient to limit the concentrations of dangerous goods classified as toxic gases to those permitted in the ACGIH's "Industrial Ventilation: A Manual of Recommended Practice for Design," and
• (c) not less than 2 air changes per hour.

(1)Fuel-fired heating appliances shall be located and separated from the remainder of the farm building in conformance with Article 2.2.1.9.