Mestek 11as-x7-4 Combustion Air Inlet Kit 4 in Gg 30-75K

Product Description

The MESTEK 11as-x7-4 is a combustion air inlet kit designed for Sterling GG series gas-fired unit heaters rated from 30,000 to 75,000 BTU/h. The kit provides a complete, ready-to-install assembly for routing outside combustion air directly to the burner section of the unit. It includes an inlet box, cap, screen, collar, deflector, gaskets, and sealant, giving the installing technician all components needed to complete the combustion air connection in a single package. The 4-inch inlet diameter matches the combustion air port on compatible GG series units. Licensed HVAC technicians and mechanical contractors typically perform this installation on new equipment or when upgrading an existing unit to direct combustion air.

This kit is used on Sterling GG series gas-fired unit heaters with inputs from 30,000 to 75,000 BTU/h that require a dedicated 4-inch combustion air inlet. It is appropriate for applications where local mechanical codes or equipment placement require outside combustion air rather than drawing room air for combustion. Typical installations include commercial spaces, warehouses, garages, and industrial facilities where indoor air quality or building tightness standards apply.

Key Features

• Complete kit includes inlet box, cap, screen, collar, deflector, gaskets, and sealant
• 4-inch inlet diameter sized for GG 30,000 to 75,000 BTU/h unit heater models
• Screen prevents debris and pests from entering the combustion air stream
• Deflector directs incoming air away from direct impingement on the burner
• Gaskets and sealant included for a sealed, code-ready installation

Compatibility

Designed for use with Sterling GG series gas-fired unit heaters rated from 30,000 to 75,000 BTU/h that use a 4-inch combustion air inlet connection.

Installation Notes

Installation should be performed by a licensed HVAC technician or mechanical contractor familiar with gas-fired heating equipment. Shut off gas supply and disconnect electrical power to the unit before beginning any service work. Follow the equipment manufacturer installation instructions and applicable requirements of the International Fuel Gas Code for combustion air inlet sizing, routing, and termination. Seal all joints per the manufacturer instructions using the included sealant to prevent infiltration of unconditioned or contaminated air.

Technical Specifications

• Inlet Diameter: 4 inches
• Compatible Unit Input Range: 30,000 to 75,000 BTU/h
• Kit Contents: Inlet box, cap, screen, collar, deflector, gaskets, sealant

Standard Information

• Brand: MESTEK
• Manufacturer Part Number: 11as-x7-4