Angle Image
prodSingleMainImgPlchldr Ejector



For over 100 years, Morgan-Isley equipment has been the name to turn to for precise, positive furnace draft control. Today, Morgan-Isley Ejector Stacks eliminate the need for flue dampers or other moving parts in the hot gas waste while substantially reducing stack heights. In addition, they can work hand in hand with modern flue gas cleaning technology.

Morgan-Isley - Product Description

The Morgan-Isley system, most often used in the Glass, Steel and Aluminum Industries, is a single ejector stack with one “turtleback” reversing valve. Low initial cost and simplified operation make the single stack system the most efficient heat recovery method available for regenerative furnaces.

When these systems are equipped with secondary regenerators, the lost heat storage capacity in the primary due to the accumulation of deposits is regained. As heat absorption in the primary decreases, the secondary receives hotter gases and absorbs more heat, which would otherwise be lost, to the combustion process. This compensation keeps combustion efficiency constant and maintains production efficiency.

Furnace designs, equipment elevations, site conditions and building dimensions can all be accommodated in the design of a Morgan-Isley system, permitting the system to be incorporated into either existing or new installations. Surface provides the full technical design, supply and installation of these systems. Maintenance and refurbishment of existing systems is also provided by Surface.

Surface provides fuel combustion systems, and advice on furnace aerodynamics, port design and auxiliary equipment, as well as full supervision and commissioning services.

Reversing Valve:

  • One valve reverses combustion air and furnace exhaust gas flow simultaneously
  • Reduces furnace temperature variations
  • Reduces reversal time
  • Very compact

Ejector Stack:

  • Eliminates need for flue dampers to control furnace pressure
  • Provides positive draft control
  • Permits substantially reduced stack heights
  • Can operate with flue gas cleaning

Secondary Regenerator:

  • Increases fuel efficiency when combines with a primary in a properly designed system
  • Reduces thermal shock at the primary arches during reversal
  • Permits a reduction in primary size, saving in both installation and maintenance costs, without a loss of combustion air preheat

System Sizing Guide

(additional sizes available)

Ejector Size Nominal Fuel Input (GJ/h*) Reversal Valve Size
1 13 3
2 19 3
3 26 3
4 34 5
5 43 5
6 54 7
7 65 7
8 77 9
9 91 9
10 105 11
11 121 11
12 138 13
13 155 13

*based on Natural Gas 35% excess air at ejector,

80 mm WG draft, inlet temperature 450°

Ready to Get Started?

Please call us when you are ready to discuss a new furnace or maintain, upgrade or replace your furnace or any part of your furnace. At Surface, we look forward to helping you with any thermal processing needs.

Call Surface with the following information ready to initiate your furnace solution.

  • furnace cyclecycle
  • furnace operationoperation
  • hours per yearhours per year
  • available spaceavailable space
  • operating temperature rangeoperating temperature range
  • heat sourceheat source

Give Us a Call

(800) 537-8980