Description
The Supco NPC34H Negative Pressure Trap is a purpose-built condensate management component designed to prevent air bypass and maintain proper drainage in HVAC condensate drain lines. Negative pressure traps are essential in systems where the air handler or evaporator coil operates under negative pressure, which can cause a standard P-trap to lose its water seal and allow unconditioned air, odors, or biological contaminants to be drawn back into the airstream.
Key Features
- Designed specifically for negative-pressure HVAC condensate drain applications
- Prevents air bypass and loss of water seal in drain lines
- Helps maintain indoor air quality by blocking contaminant backflow
- Compact design for easy installation in tight equipment spaces
- Compatible with standard condensate drain line configurations
- Durable construction for long-term, low-maintenance performance
Why Use a Negative Pressure Trap?
In many forced-air cooling systems, the blower creates a negative pressure zone around the evaporator coil. A conventional P-trap can be overcome by this suction, allowing the water seal to be pulled away and permitting air infiltration. The Supco NPC34H is engineered to hold its seal under these conditions, ensuring that condensate drains freely while blocking unwanted airflow — a critical safeguard for system efficiency and air quality.
Application
- Residential and light commercial air handlers
- Split-system and packaged HVAC units with negative-pressure drain pans
- New installations and retrofit drain line upgrades
Product Details
- Brand: Supco
- Model: NPC34H
- Type: Negative Pressure Condensate Trap
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