HHT Outside Air Kit Outside Combustion Air Kit with Access Door

HHT AKD Outside Air Kit with Access Door (Part #AKD) Enhance Fireplace Efficiency with Dedicated Outside Combustion Air Improve fireplace performance with the HHT AKD Outside Air Kit, designed to supply clean, external combustion air for optimal efficiency. Key Features Designed for Monessen vent-free fireboxes (Attribute, BUF, Lo-Rider) Improves combustion efficiency and air quality Includes access door for airflow control Helps reduce negative air pressure in tight homes Durable components for long-lasting performance Compatible with 4” outside air duct systems (sold separately) Product Features Optimized Combustion Air Supply Provides a direct source of outside air to your fireplace, improving burn efficiency and reducing indoor air depletion—ideal for modern, tightly sealed homes. Integrated Access Door Control Built-in left/right access door allows you to regulate airflow entering the firebox for better performance and control. Compatible with Monessen Vent-Free Fireboxes Specifically engineered for use with: Attribute Series BUF Series Lo-Rider Vent-Free Fireboxes Ensures proper fit and reliable operation. Improves Indoor Air Quality Reduces reliance on indoor combustion air, helping maintain healthier air quality and minimizing drafts inside your home. Flexible Installation Options Can be installed on either side of the firebox, with multiple routing options including basement, slab, or crawl space configurations . Exterior Air Hood Protection Includes an outside air hood designed to prevent debris, snow, and blockages when installed properly above grade level . Durable Construction for Long-Term Use Manufactured by Hearth & Home Technologies for dependable performance in demanding heating applications. Safety-Focused Design Prevents combustion air from being drawn from garages, attics, or enclosed spaces Designed to meet installation best practices and safety standards Product Specifications Specification Details Product Name Outside Combustion Air Kit with Access Door Manufacturer Hearth & Home Technologies (HHT) Part Number AKD Compatibility Monessen Attribute, BUF, and Lo-Rider Vent-Free Fireboxes Application Outside combustion air supply Air Intake Diameter 4 inches Duct Requirement Flexible duct ID4 (insulated) or UD4 (uninsulated) – sold separately Installation Location Exterior wall, crawl space, or basement Mounting Options Left or right side of firebox Included Components Outside air hood, collar, mounting bracket, left/right access doors, screws, cable ties Air Hood Placement Minimum 12” above snow line Clearances Minimum 3 ft from appliance vent terminals Material Metal construction Use Case Vent-free fireplace air supply kit Safety Notes Do not install in garages, attics, or enclosed spaces Installation Requirement Professional installation recommended