Mason-Lite 4" Combustion Air Kit for MFPST43 and Linear Units - MFPST-AK-M

Enhance the performance and efficiency of your fireplace installation with the Mason-Lite 4" Combustion Air Kit for MFPST43 and Linear Units - MFPST-AK-M. Designed specifically for Mason-Lite see-thru, linear, and custom fireplace applications, this fresh air intake kit helps provide outside combustion air directly to the firebox for improved airflow and fireplace operation.

This complete combustion air kit includes a closable firebox inlet that fits the factory pre-cut opening in compatible fireboxes, a durable 3-foot flexible vent conduit, and a plastic outdoor hood for reliable exterior ventilation. Ideal for modern tightly sealed homes, the kit helps support proper combustion while reducing negative air pressure inside the living space.

The MFPST-AK-M air kit is engineered for Mason-Lite MFPST43 see-thru units and square-sided linear or custom fireplaces that require a dedicated see-thru air kit configuration. When using decorative panels, a hole must be cut to accommodate the air kit installation.

Features

• Designed for Mason-Lite MFPST43 see-thru and linear fireplace units
• Provides outside combustion air directly to the fireplace
• Includes closable firebox inlet for controlled airflow
• Comes with 3' flexible vent conduit for simplified installation
• Durable plastic outdoor hood included
• Fits factory pre-cut firebox opening
• Ideal for tightly sealed and energy-efficient homes
• Helps improve fireplace combustion performance
• Required for square-sided linear and custom see-thru units
• Compatible with Mason-Lite fireplace systems