Rinnai Flue Long (D) 21 5/8"-31 1/2", All DV Furnances

A. The Rinnai FOT-178 Extra Long Flue is designed to provide a safe venting solution for compatible Rinnai direct vent wall furnaces installed through thicker exterior walls. It allows combustion air intake and exhaust gases to pass safely through the wall while supporting proper heater operation in installations requiring a flue length of approximately 15-3/4 to 23-5/8 inches.

A. The Rinnai FOT-178 is designed for compatible Rinnai direct vent wall furnace models that require the 551–1001 mm (15-3/4 to 23-5/8 inch) extra-long flue assembly. Customers should always verify heater model compatibility and wall thickness requirements before purchasing.

A. A genuine Rinnai flue is engineered to provide the correct combustion air intake, exhaust flow, and weather protection required for compatible Rinnai heaters. Using OEM venting components helps support safe operation, dependable heating performance, and compliance with manufacturer installation specifications.

A. No. The FOT-178 is designed specifically for compatible Rinnai direct vent heating systems requiring an extra-long wall flue. It should not be used with other heater models unless specifically approved by Rinnai.

A. Yes. The Rinnai FOT-178 is manufactured from durable materials designed to withstand outdoor weather conditions and continuous heating system operation. When properly installed and maintained, it provides dependable long-term venting performance.

A. Yes. Professional installation is recommended to ensure proper vent length, wall penetration, sealing, and compliance with Rinnai installation instructions, local building codes, and fuel gas regulations. Correct installation supports safe and efficient heater operation.

A. When installed according to Rinnai specifications, the FOT-178 helps maintain proper combustion air intake and exhaust flow, supporting efficient and reliable heater performance. Proper venting is essential for safe operation of any direct vent heating appliance.

A. The Rinnai FOT-178 includes the manufacturer-supplied extra-long flue components for compatible Rinnai heater installations. Customers should review the product specifications to verify the included parts and determine whether additional installation accessories are required.

A. Genuine Rinnai vent components are engineered specifically for compatible Rinnai heating systems, providing proper fit, dependable venting performance, and compliance with manufacturer specifications. OEM components help simplify installation while supporting long-term heater reliability.

A. Rural Energy supplies genuine Rinnai heating products and venting components backed by decades of experience serving homeowners and contractors throughout Alaska and other demanding cold-climate regions. Customers receive authentic OEM products, knowledgeable technical support, and trusted guidance while supporting Rural Energy's mission to Live Life Warm.