Measurement Boundaries & Advisory Methodology
How Pureflow Air conducts independent ventilation diagnostics, psychrometric modeling, and mechanical commissioning in the continental Canadian climate. We define strict boundaries around what can and cannot be solved through airflow engineering.
The Four Core Pillars of Measurement
Standardized field diagnostics eliminating conjecture from residential and small-commercial mechanical distribution schedules.
Empirical Field Manometry
We never estimate ventilation via factory fan curves or manufacturer marketing sheets. In-situ installations create unexpected static pressure through misaligned elbows, flexible duct crimps, and non-linear filter loading.
- Dual-port digital differential micro-manometers (0.001 in. w.g. resolution)
- True Pitot tube cross-sectional 16-point traverse for main supply/return trunks
- Powered flow hood verification on individual terminal registers (±3% CFM accuracy)
Psychrometric Dew-Point Governance
Winnipeg winter air at -35°C holds almost no water vapour (<0.20 g/kg). Over-ventilating with cold air rapidly reduces indoor relative humidity below 20%, drying human mucosal barriers and shrinking hardwood. Conversely, uncontrolled humidification deposits frost inside exterior wall envelopes and attic eaves.
- Indoor RH strictly governed to 28%–34% during sub-zero cold snaps
- Enthalpic core latent-recovery verification to retain occupant-generated humidity
- Condensation risk calculation mapped directly against window frame U-values
Strict Conflict-of-Interest Firewall
Most "air quality assessments" are lead-generation funnels for $12,000 heat pumps, unnecessary HRV swap-outs, or chemical duct cleaning services. Pureflow Air maintains an absolute commercial firewall.
- Zero commissions, zero equipment retail margins, zero affiliate links
- In 64% of cases, we prove client hardware is functional and only rebalancing is needed
- 100% of revenue derived transparently from hourly inspection & engineering reports
Contractor Integration & Standards
We bridge the communication chasm between homeowners, mechanical engineers, and local sheet metal trades. We deliver actionable mechanical schedules stamped to Manitoba Building Code requirements.
- CAN/CSA F326-M91 Residential Mechanical Ventilation Systems adherence
- ASHRAE 62.2 / 62.1 Continuous & Intermittent mechanical flow verification
- Clear duct damper set-point maps providing turn-by-turn guidance for tinsmiths
The Continental Vapour Cliff
This schematic illustrates why generic coastal or European IAQ strategies fail in Manitoba. When outdoor air drops below -20°C, the moisture-holding capacity of air collapses asymptotically. Unregulated exhaust systems pull this hyper-dry envelope makeup air inside, starving occupants of respiratory protection.
Demonstrative Case Studies & Project Blueprints
Representative diagnostic engagements illustrating field boundary identification and remediation pathways in Manitoba buildings.
River Heights 1950s Bungalow Retrofit
Client experienced severe triple-pane window perimeter icing and extreme thermal starvation in the northeast master suite following a high-efficiency furnace install.
Exchange District Mixed-Use Creative Loft
Upper-floor creative agency suffered intermittent grease hood backdrafting and negative pressure pulling odours from the ground-floor commercial kitchen.
St. Boniface High-Performance Net-Zero
Continuous frost-lock and core freeze events on dual counterflow Energy Recovery Ventilators (ERVs) during prolonged -38°C polar vortex events.
Formal Practice Boundaries & Non-Interference
Pureflow Air operates strictly as an engineering advisory and commissioning firm. We maintain unambiguous professional demarcations so clients and mechanical partners know exactly where our liability and scope begin and end.
What We Solve
PHYSICAL AIRFLOW & MECHANICAL SCHEDULESWe locate exact points of high external static pressure (ESP), oversized dampers, pinched take-offs, and improperly sized filter cabinets that burn out ECM blowers prematurely.
Diagnosing severe building depressurization caused by high-CFM kitchen hoods, non-balanced HRVs, and unbalanced stack effect that backdraft natural gas atmospheric appliances.
Calculating exact sub-zero recovery efficiency (-35°C frost points), calibrating supply/exhaust CFM balance, and optimizing enthalpy recovery to preserve interior humidity without window condensation.
Measuring discharge velocity across diffusers and calculating face velocity reduction strategies to silence whistling registers and high-velocity duct rumble.
Providing third-party review of contractor HVAC quotes to confirm whether proposed furnace or duct redesigns are genuinely required or simply over-specified.
What We Do Not Do
STRICT JURISDICTIONAL EXCLUSIONSWe do not sell furnaces, heat pumps, HRV cores, or filters. We never accept distributor commissions. You receive completely uncompromised advice on your current machinery.
We are not a illustrative schedule heating breakdown contractor. We do not service ignition boards, gas valves, or heat exchanger cracks. That work belongs to illustrative trade qualification gas fitters.
We measure physical air movement, particulates (PM2.5/PM10), CO2, and humidity. We never provide medical claims or note personal symptom relief.
We identify moisture imbalances that cause condensation, but we do not perform hazardous material abatement, demolition, or biocidal wash treatments.
We do not run vacuum trucks. In most modern systems, abrasive rotating brushes damage flexible connections and acoustic internal linings without resolving underlying pressure flaws.
Standardized Engagement Sequence
Pre-Survey Telemetry
Review of architectural floorplans, heating schedules, Manitoba Hydro utility data, and existing mechanical equipment specs prior to site dispatch.
Field Manometry Audit
On-site digital micro-manometer static probing across all plenum junctions, Pitot velocity runs, and individual register CFM verification.
Psychrometric Analysis
Cross-referencing observed airflow against -35°C outdoor design temperatures, window condensation curves, and envelope vapor drive limits.
Stamped Schedule
Delivery of a comprehensive, conflict-free IAQ Atlas Blueprint containing exact CFM damper positions and mechanical instructions for your tinsmith.
Have an unresolvable airflow or freezing issue?
Whether you are an architect designing an airtight envelope, a mechanical contractor seeking CSA F326 reference records, or a property owner fighting window ice, discuss your scope directly with an engineer.