Air Sealing and Static Pressure Diagnostics

What You’ll Learn:

Air Handler Sealing

• Why cabinet gaps and cracks act like “straws” pulling in moisture and dirt
• How to identify dust tracking patterns that reveal air leaks
• Proper sealing techniques using silver tape, silicone, and masking tape
• When and how to use different sealing materials for permanent vs. removable panels

Static Pressure Diagnostics

• Understanding what ECM motors actually “see” vs. total external static pressure
• How high static pressure damages blower wheels and motors
• Why you should never just sell a fan replacement without finding the root cause

Zonal Pressure Testing

• Room-to-room pressure measurement techniques using precision manometers
• Understanding pascal readings and what they mean for comfort and efficiency
• How pressure imbalances affect humidity, infiltration, and energy costs
• Real case study: 7 pascal bedroom measurement and customer consultation

Advanced Troubleshooting Tips

• Low suction pressure diagnosis: always start with airflow
• Using thermal imaging and vane anemometers for ductwork verification
• Filter bypass issues and upgrade recommendations
• Connecting equipment problems to building envelope issues

Key Takeaways:

• Noise at air handlers usually indicates sealing problems
• Air leaks cause moisture infiltration, bypassing filtration, and comfort issues
• Proper sealing techniques prevent long-term equipment damage
• Pressure imbalances affect the entire home’s comfort and efficiency
• Always clean surfaces with alcohol before applying tape or sealant

This training emphasizes practical, field-tested solutions that technicians can implement immediately. Perfect for both new technicians learning diagnostics and experienced techs wanting to expand their building science knowledge.

Tools Mentioned:

• Precision manometers
• Vane anemometers
• Thermal imaging cameras
• True flow grids
• Tape squeegees
• Silver tape, masking tape, silicone sealant