Centrotherm istp02-4 Flue Gas Test Port 2 Inch Single Wall

Product Description

The CENTROTHERM istp02-4 is a 2-inch single-wall test port fitting designed for the InnoFlue plastic venting system. It provides direct access to flue gas and condensate within the vent run, allowing combustion analysis technicians and HVAC service professionals to pull accurate flue gas samples without disassembling the vent stack. The integrated analysis port is engineered to be installed as close to the appliance as possible, which ensures that readings reflect true combustion conditions. The fitting is evaluated to UL1738 and ULCS636 by ICC, meeting the certification requirements for plastic vent systems on condensing appliances.

This test port is intended for use in residential and light-commercial condensing appliance installations where InnoFlue single-wall plastic vent pipe is specified. Typical applications include high-efficiency condensing furnaces, boilers, and water heaters that exhaust through polypropylene vent systems. It is installed inline within the flue vent run as a permanent access point for ongoing combustion diagnostics and system verification during commissioning or routine service calls.

Key Features

• Integrated analysis port provides immediate access to flue gas and condensate for combustion testing
• Evaluated to UL1738 and ULCS636 by ICC for certified safe venting performance
• Installs without glues, primers, or solvents for fast, clean assembly
• Durable and lightweight polypropylene construction suited for plastic vent systems
• 2-inch single-wall configuration matches standard InnoFlue vent pipe sizing

Compatibility

Designed for use with the InnoFlue single-wall polypropylene vent system on condensing appliances vented in accordance with UL1738 and ULCS636 standards.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with plastic flue vent systems and local mechanical code requirements. Power down and shut off gas supply to the appliance before opening the vent run. Position the test port as close to the appliance flue outlet as practical to obtain representative combustion measurements. Follow the appliance and vent system manufacturer instructions for joint assembly, as this fitting does not require adhesives or solvents.

Technical Specifications

• Pipe Size: 2 inches
• Wall Type: Single Wall
• Certifications: UL1738, ULCS636 (evaluated by ICC)
• Vent System: InnoFlue Polypropylene

Standard Information

• Brand: CENTROTHERM
• Manufacturer Part Number: istp02-4