Learn about blower door testing with multiple fans in this webinar. This video discusses:
- Fan options
- Fan calculator
- Frame options
- Controlling multiple fans
- Multi-fan compartmentalization
- Multiple fan testing
- FanTestic basics
- Fan opportunities
View commercial and multifamily blower doors from Retrotec here. Connect with our sales team directly at 1 (855) 738-7683 or you can request a quote online.
Fan Options
Retrotec offers a versatile range of fans to meet the needs of both small residential and large commercial applications:
Model 300 & 5000 series fans: Ideal for mid-sized buildings
High-output fans: Best suited for commercial spaces or multi-zone testing
Fans are compatible with a variety of digital gauges and control software
Each fan is color-coded for clarity and ships with adjustable flow range rings for accurate setup.
Fan Calculator
The built-in Fan Calculator tool helps determine:
The number of fans needed for a building’s size
Expected pressure and airflow levels
Proper range ring settings based on target CFM and building volume
This ensures technicians can plan their test with confidence and efficiency before even arriving on-site.
Frame Options
Retrotec’s modular frame systems support a range of fan sizes and configurations:
Standard aluminum frames: Lightweight and easy to set up
Hard panel and cloth panel options: For professional appearance and site flexibility
Multi-fan frames: Allow up to three fans in one doorway or multiple doors
The frames are designed for fast installation and can be combined for high-volume tests or pressurized compartments.
Controlling Multiple Fans
Running multiple fans simultaneously requires smart coordination:
Use the DM32 digital gauge with FanTestic software for unified control
Assign fans as master/slave to maintain synchronized pressure
Ensure tubing and connections are correct across all fans to avoid inaccurate readings
Control can also be done wirelessly using Virtual Gauge or GaugeRemote apps for greater flexibility on-site.
Multi-Fan Compartmentalization
In complex buildings, multi-fan setups can isolate specific areas for compartmentalization testing:
Test individual zones (e.g., stairwells, mechanical rooms, apartments)
Identify leakage between conditioned and unconditioned spaces
Validate fire and smoke control barriers, or pressure cascade designs
This is critical for hospital, lab, or high-rise performance testing.
Multiple Fan Testing
Multiple fans allow:
Higher total airflow capacity for large volume buildings
Redundancy and more accurate pressure control
Simultaneous testing of multiple floors or units
The video shows examples of test setups and results analysis using FanTestic software.
FanTestic Basics
FanTestic software plays a central role in:
Running automated or semi-automated blower door tests
Capturing test data and generating compliance reports
Managing multi-fan configurations with real-time feedback
The interface is user-friendly, with built-in protocols and error-checking to prevent mistakes during testing.
Fan Opportunities
By mastering multi-fan systems, technicians can expand into:
Large building envelope commissioning
Code compliance testing for commercial and multifamily projects
Fire-rated or compartmentalization validation
Consulting work for architects and builders on air barrier design
These services are in high demand—and multi-fan testing offers a path to premium projects and higher-value contracts.
