Complete Strategic Guide: Obtaining the RBQ 15.7 Licence – Residential Ventilation Contractor

1. What Is the RBQ 15.7 Licence and Who Needs It?

The RBQ 15.7 licence — Residential Ventilation Contractor (Entrepreneur en ventilation résidentielle) — is a specialized licence issued by the Régie du bâtiment du Québec (RBQ) for contractors who install, maintain and service residential ventilation and air distribution systems. It authorizes construction work not reserved exclusively to master pipe mechanics involving:

• Mechanical ventilation systems — principal ventilation, exhaust, make-up air and air conditioning per CAN/CSA-F326;
• Air distribution ductwork — design, sizing, installation, insulation and balancing of supply and return air ducts;
• Forced-air heating equipment — installation and connection of furnaces, duct heaters and related equipment;
• Combustion air supply — sizing of openings and ducts for gas, oil and solid fuel appliances;
• Air conditioning systems — residential cooling equipment, refrigerant piping and condensate drainage;
• Radon mitigation — sub-slab depressurization systems per CAN/CGSB-149.11-2019.

Scope: The licence applies to detached, semi-detached and row houses, and to the private portion of divided co-ownership multifamily buildings. With 130 skills across 4 modules and 20 competency elements, the RBQ 15.7 is one of the most comprehensive exams in category 15. The 18-document exam (4 open + 14 closed) represents the heaviest memorization burden in the category.

2. Scope of the Licence: Indoor Air Quality for Residential Buildings

The RBQ 15.7 covers the installation, commissioning and maintenance of complete residential ventilation and air distribution systems — systems that ensure indoor air quality by supplying fresh outdoor air, exhausting contaminated indoor air, distributing conditioned air and mitigating soil gas infiltration. What makes this licence unique within category 15 is its focus on indoor air quality and building science rather than fuel combustion — although combustion air supply for heating equipment is also covered.

The ventilation system is a complete chain: fresh air supply (outdoor air intake, filtration, heat recovery ventilator or energy recovery ventilator), distribution (ductwork sized for proper air delivery to each room), exhaust (kitchen range hoods, bathroom exhaust fans, dryer exhaust — with specific flow rates per CAN/CSA-F326), make-up air (compensating for exhausted air to prevent excessive depressurization), air conditioning (cooling coil, condensing unit, refrigerant piping), forced-air heating (furnace installation, duct connections, combustion air), and radon mitigation (sub-slab depressurization to prevent radioactive gas infiltration).

A distinctive feature of the RBQ 15.7 is the breadth of standards — with 18 reference documents spanning ventilation (F326), building codes (NBC, QCC), fuel codes (B149.1, B139, B365), capacity calculations (F280), heat pumps (C273.5), radon (CGSB-149.11), and industry guidelines (ASHRAE, SMACNA, HRAI). Module 1 alone has 41 skills — the largest foundational module in category 15.

3. RBQ Exam Format: What to Expect

• Question type: Multiple choice (MCQ)
• Duration: 3 hours (180 minutes)
• Passing grade: 60%
• Languages: French or English
• Skills assessed: 130 skills across 20 competency elements
• Exam type: Mixed (4 open-book documents + 14 closed-book documents)
• Tools provided: Calculator, ruler, paper and pencil

With 130 skills and 14 closed-book documents, the RBQ 15.7 demands extensive memorization — more closed-book documents than any other licence in category 15. The 4 open-book documents (Construction Code, F326, B149.1, Safety Code for Construction Work) must be navigated efficiently. With roughly 83 seconds per question, speed is essential.

4. Exam Documentation: Open Book vs. Closed Book

The RBQ 15.7 exam is a mixed exam with 4 documents provided (open book) and 14 to memorize (closed book) — 18 documents total.

Documents PROVIDED During the Exam (Open Book)

• Quebec Construction Code, Chapter I — Building, and National Building Code — Canada 2010 (modified) — Contains the building requirements for ventilation, ductwork, fire stopping, clearances from combustibles and energy efficiency provisions applicable to residential installations.
• CAN/CSA-F326-FM91 (C2005) — Residential Mechanical Ventilation Systems — The central reference for the 15.7 licence: minimum fresh air flow rates, exhaust requirements, make-up air, system types (HRV, ERV, exhaust-only, supply-only) and commissioning tests.
• CAN/CSA-B149.1-10 — Natural Gas and Propane Installation Code — The reference for gas piping, combustion air supply and venting requirements for gas-fired forced-air heating equipment installed by the residential ventilation contractor.
• Safety Code for Construction Work (CQLR, chapter S-2.1, r.4) — The safety requirements applicable to construction job sites, including working at heights, confined spaces and hazardous material handling during ventilation system installation.

Documents to MEMORIZE (Closed Book)

• Building Act — The foundational statute governing construction, safety, and contractor qualifications in Quebec.
• Act Respecting Occupational Health and Safety — The statute governing workplace health and safety, including employer and worker obligations on residential construction sites.
• Regulation Respecting the Professional Qualification of Contractors and Owner-Builders — The regulation setting out licence categories, qualification requirements and conditions for maintaining an RBQ licence.
• Safety Code (CQLR, chapter B-1.1, r.3) — The code governing the safety of existing buildings, including maintenance and inspection requirements for ventilation systems already in service.
• QCC Chapter I, Part I.1 — Energy Efficiency — The energy efficiency provisions of the Construction Code, including insulation, air barrier and ventilation requirements for new residential buildings.
• CSA-B139 — Installation Code for Oil-Burning Equipment — The standard for oil-fired equipment installation, relevant to combustion air supply and venting when installing forced-air heating systems burning oil.
• CSA-B365 — Installation Code for Solid-Fuel-Burning Appliances and Equipment — The standard for solid fuel appliances, relevant to combustion air requirements for wood stoves, fireplaces and pellet stoves in ventilated residences.
• CSA-F280 — Determining the Required Capacity of Residential Space Heating and Cooling Appliances — The standard for calculating building heat loss and gain to determine heating and cooling equipment sizing — essential for matching ventilation to the thermal load.
• CAN/CSA-C273.5 — Installation Requirements for Heat Pumps — The standard covering air-source and ground-source heat pump installation, relevant to residential air conditioning and heating applications.
• CAN/CGSB-149.11-2019 — Radon Control Options for New Construction in Low-Rise Residential Buildings — The national standard for radon mitigation in new construction, including sub-slab depressurization system design and installation.
• ASHRAE Standards — The American Society of Heating, Refrigerating and Air-Conditioning Engineers standards applicable to residential ventilation, thermal comfort and indoor air quality.
• HRAI Publications — The Heating, Refrigeration and Air Conditioning Institute of Canada publications covering residential HVAC system design, installation and commissioning practices.
• SMACNA Standards — The Sheet Metal and Air Conditioning Contractors' National Association standards for ductwork fabrication, installation, sealing and testing.
• Health Canada Radon Reduction Guide for Canadians — The federal guide covering radon measurement, health risks and mitigation strategies for existing residential buildings.

5. The 4 Training and Competency Modules

Module 1 — Definitions and Types of Systems (41 skills, 6 CE)

The largest foundational module in category 15. Covers indoor air quality fundamentals (comfort parameters, contaminants, health effects of poor ventilation on occupants and building structures), types of residential ventilation systems (exhaust-only, supply-only, balanced — HRV and ERV), air distribution systems (ductwork types, registers, grilles, diffusers), types of forced-air heating equipment (gas furnaces, oil furnaces, electric furnaces, heat pumps), air conditioning systems (split systems, packaged units, ductless mini-splits), combustion air supply principles, radon fundamentals (origin, health risks, infiltration pathways), air jet behaviour and diffusion patterns, and the physical principles underlying ventilation: pressure, flow rate, temperature, humidity, latent and sensible heat, thermal resistance, dew point, relative humidity and stack effect.

Module 2 — Legislative, Normative and Regulatory Framework (14 skills, 1 CE)

Covers the complete regulatory framework for residential ventilation — the most extensive document set in category 15 with 18 references to master. Tests the candidate's knowledge of: the Building Act, the Quebec Construction Code Chapter I (including Part I.1 on energy efficiency), CAN/CSA-F326 for ventilation, CAN/CSA-B149.1 for gas, CSA-B139 for oil, CSA-B365 for solid fuel, CSA-F280 for heating/cooling capacity, CAN/CSA-C273.5 for heat pumps, CAN/CGSB-149.11 for radon, ASHRAE/HRAI/SMACNA industry standards, the Safety Code, the OHS Act, and the Professional Qualification Regulation. Candidates must know which standard applies to each system component.

Module 3 — Plans, Specifications and Estimation (18 skills, 2 CE)

Covers the ability to read and interpret residential HVAC plans and specifications: floor plans showing duct layouts and equipment locations, section drawings showing duct routing through floor and ceiling assemblies, equipment schedules specifying furnace, air conditioner and ventilator specifications, duct sizing calculations (using friction loss charts and the equivalent length method), estimating material quantities for ductwork, insulation and accessories, and the National Master Specification divisions relevant to HVAC installations. This module also tests the candidate's ability to perform cost estimates for residential ventilation projects.

Module 4 — Standards and Work Execution (57 skills, 11 CE)

The most heavily weighted module on the exam — 44% of all skills. Covers the complete installation workflow: duct fabrication and installation (materials, joints, supports, sealing, insulation, vapour barriers, fire-stop assemblies), mechanical ventilation system installation (HRV/ERV mounting, duct connections, condensate drainage, controls), exhaust system installation (kitchen, bathroom, dryer — with code-specific duct materials and terminations), make-up air systems (balancing exhaust with supply to prevent excessive depressurization), forced-air heating equipment installation (furnace mounting, duct connections, combustion air supply sizing based on fuel type — gas, oil, solid fuel), air conditioning installation (condensing unit placement, refrigerant piping, condensate drainage), radon mitigation (sub-slab depressurization system installation — piping, fan, monitoring, sealing), system commissioning (flow rate measurement, balancing, performance verification per CAN/CSA-F326), and health and safety on residential job sites.

6. Key Competencies and Technical Requirements (Official Context)

CAN/CSA-F326: The Residential Ventilation Standard

CAN/CSA-F326 is the document that defines the RBQ 15.7 licence — it is the only exam in the RBQ system built around a residential ventilation standard. The exam tests candidates on the four key requirements of F326: (1) minimum ventilation capacity — the total fresh air delivery that the principal ventilation system must provide, calculated based on the number of rooms, floor area and occupancy, (2) exhaust requirements — minimum exhaust flow rates for kitchens (range hoods), bathrooms and other areas producing moisture or contaminants, (3) make-up air — the requirement to compensate for exhausted air to prevent excessive negative pressure (depressurization) that can cause backdrafting of combustion appliances, and (4) commissioning tests — the flow rate measurements and system verifications required before the system is placed in service. The standard covers four system types: exhaust-only (simplest — fans exhaust air, fresh air enters through infiltration), supply-only (fan brings in outdoor air, stale air exits through exfiltration), balanced with HRV (heat recovery ventilator — exhaust and supply fans with a heat exchanger that recovers heat from the exhaust air stream), and balanced with ERV (energy recovery ventilator — similar to HRV but also transfers moisture between the air streams).

Aeraulic Pressure Losses and Duct Sizing

Duct sizing is a core calculation skill tested across multiple modules. The exam tests the equivalent length method for calculating aeraulic pressure losses: (1) measuring the actual length of each duct section, (2) adding the equivalent lengths of all fittings (elbows, tees, transitions, dampers — each with a published equivalent length based on its geometry and size), (3) multiplying the total equivalent length by the friction rate (pressure loss per unit length, determined from friction loss charts based on air flow rate and duct diameter) to get the total pressure loss for that duct section. The exam also tests the relationship between duct diameter, air velocity and flow rate — and the practical limits on each: velocity too high causes noise and excessive pressure drop; velocity too low causes poor air distribution and settling. For residential systems, typical design velocities are 700-900 FPM for main ducts and 500-700 FPM for branch ducts. SMACNA standards (closed book) provide the fabrication and installation requirements for ductwork.

Combustion Air Supply: Three Fuel Types, Three Codes

The residential ventilation contractor installs forced-air heating equipment — and every fuel-burning appliance requires combustion air. The exam tests the combustion air requirements from three different codes: CAN/CSA-B149.1 for natural gas and propane (provided at the exam), CSA-B139 for oil (closed book), and CSA-B365 for solid fuel such as wood and pellets (closed book). Each code has specific sizing rules for combustion air openings based on the appliance input rating. The exam tests the distinction between confined and unconfined spaces, the sizing of combustion air openings (one high, one low — with different sizing factors depending on whether the air comes from outdoors or from an interior space), and the critical interaction between exhaust ventilation and combustion air: if the ventilation system creates negative pressure in the building, it can cause backdrafting — reversing the flow in the flue, pulling combustion gases into the living space instead of venting them outdoors. This is a central safety topic for the 15.7 licence.

Radon Mitigation: Sub-Slab Depressurization

Radon is a radioactive gas that naturally emanates from the soil and infiltrates buildings through cracks and openings in the foundation — it is the second leading cause of lung cancer after smoking. The RBQ 15.7 is the only licence in the RBQ system that specifically tests radon mitigation. The exam covers: radon fundamentals (origin from uranium decay, infiltration pathways through slab cracks, perimeter joints, sump pits and utility penetrations), measurement (long-term alpha track detectors, the 200 Bq/m³ Canadian guideline), and sub-slab depressurization — the primary mitigation technique. A sub-slab depressurization system consists of: a suction point (a sealed pipe penetrating the slab into the gravel layer beneath), a fan (creating negative pressure under the slab to draw radon-laden air away before it enters the building), exhaust piping (routing the collected air to the outdoors above the roofline), and monitoring (a manometer or indicator to verify the system is creating negative pressure). The applicable standards are CAN/CGSB-149.11-2019 for new construction and the Health Canada Radon Reduction Guide for existing buildings — both are closed book.

Heat Transfer and Building Science Fundamentals

Module 1 of the RBQ 15.7 dedicates 41 skills to foundational concepts — more than any other category 15 licence. The exam tests heat transfer principles that directly affect ventilation system design: sensible heat (heat that changes air temperature — measured with a dry-bulb thermometer), latent heat (heat absorbed or released during moisture phase changes — critical for understanding humidity control and condensation), and total heat (the sum of sensible and latent heat — also called enthalpy). The exam tests thermal resistance (R-value) and its role in heat loss calculations per CSA-F280, relative humidity and its relationship to occupant comfort (typically 30-50% RH for residential buildings), dew point (the temperature at which moisture condenses — critical for preventing condensation in ductwork and building assemblies), and stack effect (the natural upward air movement in buildings caused by the temperature difference between indoor and outdoor air — which creates negative pressure at the lower levels and positive pressure at the upper levels, driving both infiltration and radon entry).

HRV and ERV Systems: Balanced Ventilation with Heat Recovery

Heat recovery ventilators (HRV) and energy recovery ventilators (ERV) are the most energy-efficient residential ventilation systems — and the exam tests their design, installation and commissioning in detail. An HRV contains a heat exchanger core that transfers sensible heat only from the outgoing warm exhaust air to the incoming cold fresh air, recovering 60-85% of the heat that would otherwise be lost. An ERV uses an enthalpy wheel or membrane that transfers both sensible heat and moisture, making it more suitable for climates where humidity control is important. The exam tests: unit selection (sizing based on the ventilation capacity required by CAN/CSA-F326 and the heating/cooling load), installation requirements (mounting, vibration isolation, duct connections, condensate drainage — HRVs produce condensate in heating mode that must be drained), controls (manual, timer, dehumidistat, CO₂ sensor), duct configuration (dedicated ductwork vs. integrated with forced-air system — with specific requirements for each), and commissioning (measuring supply and exhaust flow rates, verifying heat recovery efficiency, balancing the system).

7. Preparation Strategy and Tips for Success

The RBQ 15.7 exam covers 130 skills across 4 modules with 4 open-book and 14 closed-book documents — the heaviest document load in category 15. Here is a recommended strategy:

Phase 1 — Master CAN/CSA-F326 (provided at the exam). This is the central reference document. Learn the ventilation capacity requirements, exhaust flow rates, make-up air rules, system types (HRV, ERV, exhaust-only, supply-only) and commissioning test procedures. Practise navigating this document quickly — it will be your most-used reference during the exam.

Phase 2 — Learn the Construction Code and CAN/CSA-B149.1 provisions. The Quebec Construction Code Chapter I and CAN/CSA-B149.1 are provided at the exam. Focus on the ductwork installation requirements (fire stopping, clearances, insulation), combustion air provisions for gas appliances, and energy efficiency requirements from Part I.1.

Phase 3 — Memorize the closed-book standards systematically. With 14 closed-book documents, focus on the most heavily tested: CSA-F280 (heat loss/gain calculations for equipment sizing), CSA-C273.5 (heat pump installation), CAN/CGSB-149.11 and the Health Canada guide (radon mitigation), CSA-B139 and CSA-B365 (combustion air for oil and solid fuel). For the legislative documents, focus on key articles defining contractor obligations and safety requirements.

Phase 4 — Master the calculation skills. Practise ventilation calculations, aeraulic pressure losses (equivalent length method), heat load calculations, duct sizing, combustion air opening sizing and unit conversions. Use Prof-RBQ.ca's step-by-step exercises to build speed and accuracy.

Phase 5 — Complete full timed simulations. With 130 skills and 4 open-book documents, you have roughly 83 seconds per question. Practice navigating between CAN/CSA-F326, the Construction Code, CAN/CSA-B149.1 and the Safety Code under timed conditions with Prof-RBQ.ca.

Frequently Asked Questions