OBC HVAC - House flashcards

33 cards. Read the term and the definition here. The deck at the top of this page is optional.

Building Code Act, 1992

Ontario statute that authorizes the Building Code, establishes permit and inspection powers, and defines construction, building, and enforcement responsibilities.

Ontario Building Code

Regulation under the Building Code Act containing minimum standards for construction, demolition, change of use, and HVAC installation in Ontario.

Chief Building Official

Municipal officer responsible for administering and enforcing the Building Code Act and OBC, including permit issuance, inspections, orders, and stop-work actions.

Construction under BCA

Includes erection, alteration, repair, renovation, demolition, and certain installations or changes to a building that trigger permit and Code compliance requirements.

Building permit requirement

Before construction or demolition begins, the owner must obtain a permit from the principal authority unless the Act or regulation provides an exemption.

Referenced standard

A published technical document adopted by the OBC, such as CSA B149.1 or CSA F280, whose requirements become enforceable as part of the Code.

Plans and specifications

Documents submitted with a permit application that must be sufficiently detailed to show compliance with the OBC for the proposed HVAC work.

Inspector entry power

A building inspector may enter premises at reasonable times to inspect construction and may require tests or documents to confirm Code compliance.

Part 6 HVAC scope

OBC Part 6 sets requirements for heating, ventilating, air-conditioning, duct systems, combustion air, and venting in buildings, with house-specific rules in Part 9.

Part 9 house HVAC

OBC Part 9 contains residential requirements for ventilation, heating, air-conditioning, combustion air, and duct installation in houses and small buildings.

Ventilation requirement

A house must have a ventilation system that provides outdoor air and exhausts contaminants according to OBC Section 9.32 and referenced standards.

Heating system capacity

The installed heating equipment must be sized to maintain the required indoor design temperature at the outdoor winter design condition, based on calculated loads.

CSA F280 load calculation

Standard method for calculating residential heating and cooling loads, accounting for envelope, windows, orientation, infiltration, and internal gains before equipment selection.

Outdoor design temperature

The winter or summer weather value used in load calculations, taken from the OBC supplementary standards or recognized design data for the location.

Equipment sizing rule

Select HVAC equipment whose rated capacity meets the calculated load without excessive oversizing, following OBC, CSA F280, and manufacturer performance data.

Thermostat location

A thermostat must be accessible and located to sense representative room temperature, away from direct sunlight, drafts, and heat-producing appliances.

Combustion air supply

Fuel-fired appliances need a permanent, unobstructed air supply sized per CSA B149.1 or B139 and OBC, using indoor or outdoor air sources.

Vent termination clearance

Vent outlets must be located away from windows, doors, air intakes, and property lines as specified by the appliance listing and CSA venting standards.

Clearance to combustibles

The minimum distance between a heat-producing appliance or vent and combustible material, established by the listing, OBC, and manufacturer instructions.

Carbon monoxide alarm

A dwelling with a fuel-fired appliance or attached garage must have CO alarms installed in locations required by the OBC to warn occupants of dangerous CO levels.

Duct insulation requirement

Ducts in unconditioned spaces must be insulated and sealed to limit heat loss and condensation, with a continuous vapour barrier where required.

Return air restriction

Return air must not be drawn from bathrooms, kitchens, garages, or rooms with fuel-fired appliances where contaminants or safety hazards exist.

Bathroom exhaust fan

An exhaust fan must remove moisture and odours directly outdoors, with capacity and controls meeting OBC Section 9.32 ventilation requirements.

Fire damper application

A fire damper is installed where an air duct penetrates a fire-rated separation to maintain the separation's integrity and must remain accessible for inspection.

Firestop at penetration

The annular space between a duct or pipe and a fire-rated assembly must be sealed with an approved firestop system tested to ASTM E814 or equivalent.

Smoke damper function

A listed damper installed where smoke control or smoke-tight separation is required, designed to restrict smoke movement through ductwork and remain accessible.

Energy efficiency compliance

OBC energy provisions require minimum insulation, equipment efficiency, duct sealing, and airtightness, often demonstrated through Supplementary Standard SB-12 for houses.

Heat recovery ventilator

An HRV exhausts stale indoor air and supplies outdoor air while transferring heat between airstreams, improving ventilation and energy performance in tight houses.

Duct leakage testing

A test that measures air leakage from duct systems to verify sealing and compliance with energy or commissioning requirements before concealment or occupancy.

Approved plans on site

The permit-approved drawings and specifications must be available at the site so the installer and inspector can verify the HVAC work matches the approved design.

Concealment inspection

An inspection required before HVAC ducts, vents, or equipment are covered by finishes, allowing the inspector to verify Code compliance while components remain visible.

As-built documentation

Final drawings and equipment records reflecting the installed HVAC system, including changes, test results, and maintenance information for the owner.

Commissioning record

A documented verification that HVAC equipment, controls, ventilation rates, and safety devices operate as designed and meet OBC and manufacturer requirements.