Multi-unit dryer exhaust: shared ducts, pressure and fire
Verify whether a dryer vents directly outdoors or into a common system before replacement, relocation or addition.
VERT / GREEN
Clean lint filter and keep outdoor termination accessible for individual systems.
JAUNE / YELLOW
A common exhaust must be designed for required pressure/fire conditions; it is not a casual field-added Y connection.
ROUGE / RED
Unknown shared duct, air/lint backflow between suites, blocked damper or altered fire separation penetration: diagnose before use.
Quick triage
What the professional checks
The professional checks airflow, length/diameter, common-duct negative pressure, dampers, lint, fan, fire separation and service access.
Official sources
- CNRC — Guide illustré CNB, conduits d’évacuation communs
- Santé Canada — ventilation et milieu intérieur
- Santé Canada — qualité de l’air intérieur
Checked 2026-08-23
Related path
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These links connect this page to the next useful checks and decisions without repeating the full content.
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Manage the project through closeout
V14
Systems to check before closing the work
V14 connects envelope, air, fire, structure, water and code instead of treating each project in isolation.
V15
Remaining system checks not to miss
V15 covers issues that can block a project, cause a loss or become expensive once concealed.
V17
Specialized systems to cross-check
V17 completes gas, soil, water, fire, climate and structural interfaces.
V26
Often-overlooked service interfaces
V26 connects systems that cross utility, plumbing, HVAC, envelope and metering boundaries.
V27
Project risks and overlooked interfaces
V27 connects payment, water, envelope, ventilation and jobsite details that often create costly surprises.
V30
Shared, access and specialized interfaces
V30 connects projects where multiple systems, owners or rules meet.
V32
Post-disaster and legacy systems
V32 connects contamination, storm damage, legacy materials and recommissioning before rebuilding.