The Air Movement Atlas for Prairie Buildings.
Clear, measurement-grounded ventilation, filtration, and psychrometric airflow planning for Winnipeg residences and commercial envelopes navigating extreme sub-zero differentials.
In prairie building science, ventilation is governed by the indoor glass condensation line. Balancing outdoor air delivery prevents attic frost drive while sustaining continuous CO₂ clearing.
We do not sell miracle filter cartridges or proprietary ozone gadgets. Pureflow models static fan load, CSA F326 CFM balancing, and MERV 13 differential pressure profiles.
Interactive Airflow Vector Schematics
Examine how severe temperature swings alter intake thermal pre-tempering, plenum distribution friction, and exhaust moisture safety.
The Prairie Negative Pressure Trap
In severe cold (-25°C to -40°C), an unbalanced exhaust HRV pulls cold prairie air into concealed wall cavities, causing structural freeze-thaw decay. We commission manometer balance across low and high speeds.
Commissioning Deliverable Package
Full digital balance log, motor watt verification, register balancing sheet, and clean air turnover rates room-by-room.
Preventing 3 PM Cognitive Stagnation
In modern weatherized commercial envelopes, closed boardroom doors cause CO₂ to exceed 1,400 ppm before mid-afternoon. Pureflow calibrates supply drop velocities so air exchanges without creating draft chills.
Office Airflow Balance Audit
Third-party report for facility managers to document tenant IAQ planning and reduce unnecessary boiler preheat load.
Humidification Can Destroy Heritage Brick
Commercial tenants often demand 40%+ indoor humidity in winter. In century-old brick without modern vapour membranes, moisture migrates into mortar, freezes, and shears brick faces clean off. We model exact safe relative humidity ceilings.
Psychrometric Envelope Clearance
Comprehensive dewpoint analysis prior to humidification equipment installation or envelope air sealing.
Five Focused IAQ Engineering Scopes
Independent diagnostic balance. Pureflow operates purely as an advisory and commissioning consultancy—we do not sell equipment mark-ups or proprietary hardware.
Ventilation Review
Full measurement of continuous fresh air baseline CFM. Verification of HRV/ERV sensible recovery core health, frost cycle duration, and intake louver clearance from snowdrifts.
Filtration Strategy
Evaluating particulate efficiency against fan static limitations. Designing MERV 11 to 14 transitions that filter wildfire smoke and prairie dust without choking blower motors.
Airflow Analysis
Pitot tube and anemometer duct traverses. Pinpoint why second-storey bedrooms or remote offices starve for air while primary floor supply grilles roar with excessive noise.
Seasonal Protocols
Customized seasonal playbooks. Calibrating winter low-humidity targets (protecting attic sheathing) versus summer latent cooling dehumidification profiles across June–August.
Contractor Liaison
Clear, unyielding mechanical specs for your sheet metal installer or HVAC contractor. We speak their technical dialect, provide target CFM numbers, and verify work post-install.
Demonstrative Planning Ranges
Clear mechanical review envelopes for Winnipeg and Red River Basin properties. Each scope reflects field instrument hours, engineering analysis, and formal report generation.
Residential IAQ & HRV Diagnostic
Single-dwelling assessment focused on core balancing, furnace blower external static pressure measurement, and intake screen verification.
- Supply & exhaust airflow CFM balance
- Total static duct resistance check
- Winter indoor RH safe-limit calibration
Comprehensive Distribution & Duct Audit
For homes or offices with uneven temperatures, persistent dust, noisy registers, or post-addition airflow issues.
- Individual register flow hood quantification
- MERV 13 pressure drop upgrade simulation
- Attic bypass and envelope duct leakage check
- Contractor-ready duct alteration layout
Commercial Suite / DOAS Commissioning
Designed for professional offices, clinics, and multi-tenant suites needing verified compliance under ASHRAE 62.1 standards.
- ASHRAE outdoor air rate compliance report
- CO₂ peak logging in high-density boardrooms
- Exhaust-to-supply envelope pressure balance
Instrument reference on the Coldest Mornings.
You cannot balance a prairie ventilation system from a computer simulation alone. When the outside air drops below -30°C, air density increases, dampers stiffen, and thermal stack effect alters circulation paths.
Determining whether high-efficiency MERV 13 filtration is inadvertently starving the blower motor or tripping high-limit thermal switches.
Establishing exact relative humidity safety ceilings to keep your window sills and wall assemblies bone dry while maintaining comfort.
Honest Prairie Engineering Disclaimer & Boundaries
NO MEDICAL CLAIMSPureflow Air is an architectural mechanical consulting and airflow commissioning service. We do not manufacture medical devices, promise allergy treatment, or endorse unscientific ionization hardware. Air quality improvements result strictly from calculated fluid dynamics: adequate outdoor air replacement (ACH), balanced mechanical ventilation, envelope moisture management, and verified particulate filtration efficiency under CSA F326 and ASHRAE guidelines.
Ready for a Measurable Evaluation of Your Building's Air Movement?
Share your floor plan, mechanical equipment schedule, or cold-weather symptoms. We’ll outline a straightforward diagnostic plan.
Winnipeg, MB & Surrounding Rural Municipalities · Typical response within 1 business day