MERV/HEPA air filtration without choking the system

Improve particle filtration without exceeding blower capability or creating pressure drop that reduces airflow.

VERT / GREEN

Record filter size, HVAC model and baseline pressure/airflow.

JAUNE / YELLOW

MERV 13 can be very useful for PM2.5, but only if the system can handle the pressure drop.

ROUGE / RED

Low airflow, equipment overheating/freezing or improvised filter: return to a safe setup and measure the system.

System triage

Upgrade to MERV 13 or higher
Verify system capability and static pressure rather than choosing by MERV alone. Noisy blower/low airflow
Measure filter, return, ducts and static pressure before proceeding. Frequent wildfire smoke
Combine suitable central filtration with a properly sized HEPA cleaner when needed. Filter changed and airflow normal
Document model and replacement interval.

What the professional checks

The HVAC technician measures static pressure and airflow, confirms blower capability and checks return, filter and coils.

Official sources

Santé Canada — espaces à air plus propre

Vérifié / checked: 2026-08-23

V16

Advanced diagnostics to cross-check

V16 connects water, soil, climate, safety, materials and seasonal use to existing projects.

Drinking-water quality and treatment

V31

Commissioning and everyday safety

V31 helps verify systems after work and document the values that make a home safer to operate.

HRV/ERV: frost, condensate and balancing