Lochinvar 100140484 PVC Concentric Vent Termination Kit - CVK3007 4-Inch

The Lochinvar 100140484 (CVK3007) is a 4-inch PVC Concentric Vent Termination Kit designed for use with Lochinvar Knight fire tube boilers and water heaters. This factory-engineered kit provides a single-penetration sidewall or vertical termination solution, routing both combustion air intake and exhaust flue gases through one concentric pipe assembly — simplifying installation and reducing the number of wall penetrations required.

Constructed from durable Schedule 40 PVC, this kit is built to handle the condensing flue gas temperatures typical of high-efficiency boiler applications. The concentric design keeps the outer combustion air pipe and the inner exhaust vent pipe coaxially aligned for a clean, professional termination.

Key Features:

• 4-inch concentric PVC vent termination configuration
• Schedule 40 PVC construction for durability and corrosion resistance
• Single-hole wall penetration for both intake and exhaust
• Kit includes: 6" to 4" reducer, 6" diameter flexible pipe coupling, rain cap, 6" diameter outer pipe, 4" inner vent pipe, and concentric "Y" fitting
• Certified to ANSI Z223.1 and CSA B149.1 industry standards
• Maximum extension dimension of 60 inches per Lochinvar installation guidelines
• Manufacturer Part Number (MPN): 100140484 | Factory Kit Number: CVK3007

This kit is the factory-approved concentric venting solution for Lochinvar Knight boiler models rated 285–399 MBtu. It is also cross-referenced as a Lochinvar/A.O. Smith OEM part. Standard Schedule 40 PVC solvent cement is used for field assembly per Lochinvar installation instructions (INS7223).