Mestek 11as-x7-v5 Combustion Air Inlet Kit 5 Inch

Product Description

The MESTEK 11as-x7-v5 is a vertical combustion air inlet kit designed for use with XF series gas-fired unit heaters rated from 100,000 to 250,000 BTU/h. The kit provides a complete, field-ready assembly for routing outdoor combustion air vertically into the appliance. It includes an inlet box, cap, screen, deflector, gaskets, and sealant, giving the installing technician everything needed to complete the combustion air connection without sourcing additional components. Licensed HVAC mechanics and gas appliance installers working on commercial or industrial heating equipment are the primary installers of this assembly.

This kit is designed for vertical combustion air inlet installations on Sterling-branded XF series unit heaters in the 100,000 to 250,000 BTU/h capacity range. It is suited for commercial and industrial spaces where direct-vent or separated combustion configurations are required and where the combustion air intake must terminate through the roof or a vertical surface. The 5-inch inlet diameter matches the specified flue and air intake sizing for qualifying XF series units.

Key Features

• Complete vertical combustion air inlet assembly for XF series unit heaters
• 5-inch inlet diameter sized for XF 100,000 to 250,000 BTU/h units
• Includes inlet box, cap, screen, and deflector for a full installation
• Gaskets and sealant included to ensure an airtight, weather-resistant connection
• Designed for vertical termination through roof or overhead surfaces

Compatibility

Designed for use with Sterling XF series gas-fired unit heaters rated from 100,000 to 250,000 BTU/h equipped with a 5-inch combustion air inlet.

Installation Notes

Installation should be performed by a licensed HVAC technician or gas appliance mechanic familiar with combustion air requirements per the International Fuel Gas Code (IFGC). Shut off gas supply and disconnect power to the unit heater before beginning any inlet connection work. Follow the unit heater manufacturer installation manual for proper penetration sealing, cap orientation, and screen clearance requirements. Do not operate the unit before verifying all gaskets are properly seated and sealant has fully cured.

Technical Specifications

• Inlet Diameter: 5 inches
• Compatible Unit Capacity Range: 100,000 to 250,000 BTU/h
• Kit Contents: Inlet box, cap, screen, deflector, gaskets, sealant
• Termination Orientation: Vertical

Standard Information

• Brand: MESTEK
• Manufacturer Part Number: 11as-x7-v5