Rinnai FOT-103 Direct Vent Heater Pipe Extension 21″–39.6″ Kit for EX38

Overview

🔧 Product OverviewThe Rinnai FOT-103 Vent Extension Kit is a factory OEM accessory designed to extend the direct vent penetration length for Rinnai EX38 wall furnaces. This kit increases the allowable vent thickness from 21 inches up to 39.6 inches, making it essential for installations involving deep walls, thick masonry, layered construction, or retrofit scenarios.This Rinnai-certified kit ensures proper combustion air intake and safe exhaust venting, preserving the heater’s efficiency and compliance with venting specifications.🔧 Key FeaturesFits Rinnai EX38 direct vent wall heaterExtends vent length from 21″ to 39.6″Includes rigid and flexible vent components (as pictured)OEM Rinnai part ensures correct fit and safe operationRequired when wall thickness exceeds standard vent allowancePreserves proper combustion air and flue performanceIdeal for retrofit projects or unique building constructionHeavy-duty construction for long-lasting reliability🔧 Ideal ApplicationsDirect vent heater installations through:Thick framed wallsBrick or concrete blockStone or exterior insulated wallsRetrofit installations requiring longer passagesResidential and commercial Rinnai EX38 wall heater projects🔧 Compatibility✔ Rinnai EX38 direct vent wall furnace✔ Works with standard Rinnai vent termination systems✔ OEM replacement for original vent extension componentsNot compatible with:✘ Other Rinnai heater models (EX08, EX11, EX22, EX41 require different extensions)✘ Non-Rinnai vent systems

Product details

Package includes

• Rinnai FOT-103 Direct Vent Heater Pipe Extension 21"–39.6" Kit for EX38

Included components and any stated pack quantity are as described in this listing. Optional accessories shown separately are sold separately unless expressly included above.