CENTRAL TOWER MELTING FURNACE
GM-H SERIES
The GM-H Series is a gas-fired aluminum shaft furnace for high-volume, central melting. This gas-fired tower melting furnace uses the vertical shaft to preheat incoming charge and combines melting with an integrated holding capacity. An automatic elevator supports regular charging, while PLC and color-HMI controls help manage the process. Specify it around charge condition, required melt rate, holding reserve and the route for central molten aluminum supply to downstream casting lines.
TECHNICAL OVERVIEW
The GM-H is a central aluminum melting and holding furnace built for plants with sustained aluminum demand. Its vertical shaft preheats suitable charge before final melting, and the integrated holding capacity buffers molten metal for downstream transfer. Automatic charging and PLC/HMI controls support steady-state aluminum melting when the charge rate and casting demand are coordinated. Melt rate, holding reserve and transfer method should be sized from actual production data, not headline capacity alone.
In counter-flow shaft melting, aluminum charge descends through the tower while hot exhaust gases rise past it. This counter-flow heat recovery preheats the feed before it reaches the melting zone, making better use of burner energy. Closed-door operation and managed charge condition can reduce oxidation and dross. Actual fuel use and metal recovery depend on alloy, feed cleanliness, moisture, temperature control, charging rhythm and operating practice.
The GM‑H Series combines high‑efficiency melting technology with advanced automation and rugged industrial design. Key features include a central tower (shaft) preheating system, thick multi‑layer insulation for exceptional thermal efficiency, and dual air blowers with VFD motors for optimized combustion. The furnace is equipped with a PLC‑based control system, color HMI touchscreen, and optional laser metal‑level monitoring for precise process control. Material handling options such as pneumatic tap‑out spouts, dipwells, and electric launder systems enhance operational flexibility. With reduced gas consumption, improved melt cleanliness, and long refractory life, the GM‑H Series is a powerful solution for high‑volume aluminum melting operations.
HIGH THERMAL EFFICIENCY BY DESIGN
We Add Multiple Layers of Insulation.
Insulation helps reduce heat loss and fuel use, but the outer shell can still become hot; operators should follow hot-surface precautions.
THICKER INSULATION
We Add Way More Insulation to Our Furnaces Than Most Manufacturers.
The result is even greater efficiency and a solid, sturdy construction which is hard to beat.
EASY TO OPERATE INTERFACE
Greater Control - Means Greater Efficiency.
The GM-H Series central tower melting furnaces feature state-of-the-art PLC control with large color HMI screens with easy to read graphics - all at no extra charge. See in real time all furnace functions and change any setting on the fly. Now that's control.
CHOOSE YOUR CONTROL SYSTEM
We Give You Options of PLC & HMI.
Select the control system that is best for you and easiest for your maintenance team.
DUAL AIR BLOWERS
Two are Better Than One.
Using double air blowers gives us more flexibility and precision in the amount of air available for the melting and holding chambers at any given time. When balanced correctly they increase the efficiency of the furnace and reduce running costs.
VFD DRIVE BLOWER MOTORS
Better Efficiency and Lower Operating Cost.
Lots of air without control wastes a significant amount of energy. We use VFD Drives combined with Premium Inverter Duty Motors to give you greater RPM only when it is needed. All this translates into greater efficiency, lower operating costs, quieter operation, soft start and longer motor life. The advantage is clear. This is just one of the many ways we use to increase furnace efficiency, and reduce long term operating costs.
POUR, DIPOUT OR LAUNDER
Three Options To Meet Your Needs.
Depending on the specified configuration, GM-H metal discharge can be planned around a tap-out spout, dipwell or launder. Confirm which arrangements are available for the model and plant layout.
LASER LEVEL MONITORING
Precise and Dependable Molten Metal Level Measurement.
Probe type molten metal level sensors can corrode and be affected by dross buildup, and in time they can give back false readings. Our laser level system is no contact, precise, dependable, and durable, and offers long term maintenance free operation.
TWO SIDE CLEANOUT DOORS
We Made Furnace Cleaning Easier.
The two side cleanout doors provide access for regular cleaning of the GM-H tower furnace. Confirm the full cleaning procedure, cool-down requirements and safe access points for the specified installation.
AUTOMATED CHARGING
Eliminates Tedious Charging and Simplifies Operation.
The other end of this furnace features a shaft melter with an automatic elevator which has a tilting cart for ingots, returns and scrap. The carts are inserted at the bottom with various types of aluminum material and the cart travels up, the shaft melting lid is opened and the cart dumps the load, and returns to the bottom. The cart is pulled out and another full cart is loaded.
INFRARED STACK LEVEL SENSOR
Optimized Shaft Filling.
This furnace features an infrared sensor which monitors the level of material in the melting shaft. Once the correct level is achieved a signal is sent to the elevator to sent the cart up with more material. The system ensures optimized filling for maximum performance.
SHAFT ELEVATOR CONTROL
Simplifies Elevator Loading.
All the controls needed to operate and load the shaft elevator with carts are on a separate panel located right on the elevator.
AIR MANIFOLD
Complete System Included.
The furnaces comes with a dependable air manifold that is properly scaled for the pneumatic air cylinder which operates the shaft melting cover. Air is used also to keep the shaft level sensors clean and clear.
ARTICULATING CLEANOUT DOOR PANEL
Simplifies Furnace Cleaning.
Allows the opening and closing of both side cleanout doors with a clear view of the doors. The panel is located conveniently and can be pushed out of the way when not needed.
QUICK CONNECT
Fast Onsite Connection.
Our quck connection plugs eliminate onsite wiring errors and allow for quick onsite furnace assembly and future maintenance. It is one of the little things that count and make our furnaces different.
HIGHEST RETURN ON INVESTMENT
We Give You More Furnace for Your Money.
To be competitive today’s economy requires that manufacturers run their operations more efficiently and cost effectively than ever before. We offer the highest ROI (return on investment) in the industry. Dynamo gives you high-quality products for a reasonable investment and with more features than any other company. Simply put, we give you the most for your money!
HIGH QUALITY COMPONENTS
We Use Brand Name Components You Know and Already Use.
We use only the finest quality components that are open source and readily available locally in your area, or from our online parts store.
REMOTE SERVICE
We Can Remotely Troubleshoot Your Furnace from Our Facility.
For GM-H projects configured with a Remote Connectivity Unit, the system provides a connection which allows our furnace technicians to remotely check the performance of the furnace, make any needed changes to the program or HMI, or to troubleshoot it directly from our service center. The customer is only required to connect the unit to the Internet via an Ethernet cable. We handle the rest.
INDUSTRY 4.0 REMOTE MONITORING
Remotely Monitor Your Furnace Performance From Any Device.
As an option, all our furnaces are available with Industry 4.0 remote performance monitoring units which feature a custom dashboard. You can not only monitor furnace performance, but you can be notified before an issue occurs. Included are condition based maintenance reminders and shift performance statistics. Minimize impact of emergencies and maximize furnace uptime, and productivity. See what is going on with the furnace and your production from any device, anywhere in the world.
FIVE STANDARD SIZES
Flexible Range of Applications.
Available from 2200 lbs melting per hour all the way to 6600 lbs, the GM-H Series central tower melting furnaces can handle almost any melting application.
| Standard | US / Imperial (Al) | Metric (Al) | ||
| Model | Holding | Melting/h * | Holding | Melting/h * |
| GM-H-6600 | 6600 lb | 2200 lb | 3000 kg | 1000 kg |
| GM-H-8800 | 8800 lb | 3300 lb | 4000 kg | 1500 kg |
| GM-H-11000 | 11000 lb | 4400 lb | 5000 kg | 2000 kg |
| GM-H-13000 | 13000 lb | 5500 lb | 6000 kg | 2500 kg |
| GM-H-17600 | 17600 lb | 6600 lb | 8000 kg | 3000 kg |
Applications For The GM-H Series Aluminum Central Tower Melting Furnace
A central tower layout fits foundries with sustained, high-volume aluminum demand rather than a single intermittent casting cell. The GM-H combines shaft preheating, melting and an integrated holding reserve to support a steady central molten aluminum supply. Review hourly and peak demand, charge preparation, and the receiving process before specifying the furnace. For the planning method, see Dynamo’s central tower melting guide.
For plants supplying several high-pressure or low-pressure die-casting cells, the central furnace must be matched to the transfer route and the temperature reserve required at each machine. GM-H can provide central melting and holding, while molten aluminum distribution to casting cells may use ladles, launders or other project-specific arrangements. Compare central supply with cell-side melting in the die-casting foundry application guide.
The GM-H shaft is suited to ingots and clean, prepared returns whose size and condition fit the charging path. Alloy compatibility, moisture, coatings and contamination must be assessed before charging; lower-grade or mixed scrap should not be assumed suitable. If large aluminum sows or T-bars must be charged alongside conventional feed, compare the separate ramp route of the GM-K ramp-shaft furnace.
With its large melting chamber and stable holding environment, the GM‑H Series supports alloy preparation and melt conditioning before casting. Operators can add alloying elements, perform degassing, and maintain precise temperature control to achieve consistent alloy composition. The furnace’s advanced automation ensures uniform melt quality, making it ideal for producing high‑performance castings where metallurgical consistency is essential.
The GM‑H Series is widely used in automotive and aerospace foundries that require large volumes of clean, temperature‑stable molten aluminum. Its fast melt rates, low emissions, and high thermal efficiency support demanding production schedules. The furnace’s robust refractory construction and automated controls allow long operating cycles with minimal downtime, making it suitable for mission‑critical industrial casting environments.
The GM‑H Series is designed for operations focused on reducing fuel consumption and improving sustainability. Its multi‑layer insulation, optimized burner system, and tower preheating design significantly lower energy usage compared to conventional furnaces. Facilities benefit from reduced operating costs, lower emissions, and improved thermal efficiency — all without sacrificing melt quality or throughput.
In multi-line operations, GM-H provides central molten aluminum supply with melting capacity and an integrated holding reserve sized to the combined demand. Plan molten aluminum distribution to casting cells, ladle-pouring stations or gravity-casting lines around transfer distance, temperature loss and peak consumption. Optional launder, dipwell and pneumatic tap-out arrangements should be selected for the actual plant layout.
The GM‑H Series is built for continuous operation, making it ideal for plants that run extended production cycles. Its durable refractory lining, VFD‑driven blowers, and PLC‑based control system ensure stable performance with minimal maintenance interruptions. This reliability is essential for facilities that cannot afford downtime, such as automotive casting plants, large foundries, and high‑volume aluminum processors.
Frequently Asked Questions About The GM-H Series Aluminum Central Tower Melting Furnace
A central tower melting furnace provides significantly higher thermal efficiency and lower operating costs compared to traditional reverberatory or crucible furnaces. The GM‑H Series uses a tall shaft to preheat aluminum feedstock with rising exhaust gases, dramatically reducing fuel consumption per ton of metal. Its closed‑door operation minimizes heat loss and oxidation, resulting in cleaner metal and reduced dross formation. Combined with advanced combustion control and multi‑layer insulation, the GM‑H Series delivers superior melt quality, faster melting rates, and long refractory life — making it ideal for high‑volume aluminum processors.
GM-H is intended for aluminum ingots and suitable clean, prepared returns that fit the shaft-charging route. Material size, alloy, density, moisture and contamination affect charging, oxidation and melt quality; verify them with Dynamo before selecting a configuration. Oversized sows or T-bars may be better suited to a ramp-and-shaft layout rather than being assumed suitable for this tower.
Shaft preheating, closed-door operation and controlled melting can limit unnecessary oxidation and dross, supporting high aluminum metal yield and reduced metal loss. The aim is to minimize aluminum melt loss and improve metal recovery, but there is no universal guaranteed yield: results depend on alloy, charge cleanliness, temperature, skimming and operating practice. Compare charged and recovered metal over representative production runs to quantify the benefit.
Yes — the GM‑H Series is specifically designed for continuous, high‑throughput aluminum melting. Its large melting and holding capacity, efficient burner system, and advanced PLC‑based controls support long operating cycles with minimal downtime. Foundries and die‑casting plants benefit from its ability to deliver a steady supply of molten aluminum with consistent temperature and quality. Optional launder systems, dipwells, and pneumatic tap‑out spouts allow seamless integration into multi‑line casting operations, making the GM‑H Series ideal for large‑scale production environments.
Yes — GM‑H Series aluminum central tower melting furnaces are available throughout the United States, Canada, and Mexico. Foundries, die‑casting plants, and aluminum processors across North America rely on these furnaces for efficient melting, reduced fuel consumption, and consistent metal quality. Regional availability ensures faster delivery, dependable technical support, and access to replacement parts. Units can be configured with various capacities, burner systems, automation packages, and metal‑handling options to meet specific production requirements.
DO YOU NEED SMALLER CAPACITY?
Compare the GM-E mini stack furnace for compact, in-cell aluminum melting.
We have a full line of smaller holding and melting capacity tower melting furnaces with the same great features and options.
Applications For The GM-H Series Aluminum Central Tower Melting Furnace
The GM‑J Series is engineered for foundries that require high‑capacity aluminum melting with fast melt rates and consistent thermal performance. Its wide reverberatory chamber allows efficient heat transfer across large surface areas, enabling the furnace to process significant volumes of ingots, sows, and scrap. This makes it ideal for large‑scale operations where melt demand is continuous and production schedules depend on reliable, high‑throughput melting performance. The furnace’s robust construction and optimized burner system ensure stable operation during long production cycles.
Die‑casting plants and casting lines rely on a steady supply of clean, temperature‑stable molten aluminum. The GM‑J Series delivers continuous melting with precise temperature control, ensuring consistent metal quality for high‑pressure die‑casting (HPDC), low‑pressure die‑casting (LPDC), gravity casting, and permanent‑mold casting. The tilting mechanism provides smooth, controlled metal discharge directly into ladles or transfer systems, reducing turbulence and minimizing dross formation. This results in cleaner metal and improved casting performance across all downstream processes.
The GM‑J Series is designed to handle a wide variety of aluminum feedstock, including bulky scrap, runners, gates, and mixed returns. Its large melting chamber and powerful burner configuration allow it to process irregular or contaminated scrap more efficiently than smaller furnaces. The closed‑door melting process reduces oxidation, while the reverberatory design ensures uniform heat distribution across the charge. This makes the furnace an excellent choice for recycling‑focused facilities and foundries looking to reduce raw material costs without compromising melt quality.
With its stable thermal environment and large molten bath, the GM‑J Series supports alloy preparation and melt conditioning before casting. Operators can add alloying elements, perform degassing, and maintain precise temperature control to achieve consistent alloy composition. The furnace’s uniform heat distribution ensures that alloying materials dissolve evenly, improving metallurgical quality and reducing variability in casting performance. This makes the GM‑J Series ideal for producing high‑performance aluminum alloys used in automotive, aerospace, and industrial applications.
Automotive and industrial casting operations require large volumes of clean molten aluminum delivered at consistent temperatures. The GM‑J Series is built for these demanding environments, offering fast melting rates, low emissions, and stable temperature control. Its durable refractory lining and efficient burner system support long operating cycles with minimal downtime. Whether feeding multiple casting lines or supplying a centralized ladle‑pouring station, the GM‑J Series provides the reliability and throughput needed for high‑volume production.
The GM‑J Series is designed for facilities focused on reducing fuel consumption and improving operational efficiency. Its closed‑door melting process minimizes heat loss, while the optimized burner system maximizes thermal efficiency. The reverberatory chamber design ensures even heat distribution, reducing melt times and lowering overall energy usage. This makes the furnace a strong fit for cost‑sensitive operations seeking to reduce energy expenses without sacrificing melt quality or production capacity.
The tilting mechanism of the GM‑J Series allows operators to pour molten aluminum directly into ladles, transfer launders, or automated casting systems with exceptional control. Smooth tilting minimizes turbulence, oxidation, and dross formation — critical factors for producing clean, high‑quality castings. This application is especially valuable for gravity casting, permanent‑mold casting, and die‑casting operations where metal cleanliness directly affects product quality and scrap rates.
The GM‑J Series is built for continuous operation, making it ideal for plants that run extended production cycles. Its heavy‑duty refractory lining, high‑efficiency burners, and robust tilting mechanism ensure stable performance with minimal maintenance interruptions. This reliability is essential for facilities that cannot afford downtime, such as automotive casting plants, large foundries, and high‑volume aluminum processors. The furnace’s ability to maintain consistent melt quality over long periods enhances overall process stability and production efficiency.
Frequently Asked Questions About The GM-H Series Aluminum Central Tower Melting Furnace
A tilting reverberatory furnace provides superior control, efficiency, and metal cleanliness compared to fixed furnaces. The GM‑J Series uses a wide, open melting chamber with high‑performance burners to achieve fast melting rates and uniform heat distribution across the charge. The tilting mechanism allows operators to pour molten aluminum smoothly and safely, reducing turbulence and minimizing dross formation. This eliminates the need for manual ladling, improves operator safety, and ensures cleaner metal transfer — all of which contribute to higher casting quality and lower scrap rates.
The GM‑J Series is designed to melt a broad range of aluminum feedstock, including ingots, sows, scrap, runners, gates, and mixed returns. Its large reverberatory chamber accommodates bulky or irregular scrap that smaller furnaces cannot process efficiently. The optimized burner layout ensures uniform heat distribution, allowing the furnace to melt both primary and secondary aluminum with consistent performance. This flexibility makes it ideal for foundries and recycling operations that rely on diverse feedstock sources.
The GM‑J Series uses a closed‑door melting process and carefully engineered burner placement to maintain a stable, low‑oxygen environment inside the furnace. This significantly reduces oxidation and dross formation during melting. The reverberatory design ensures even heat transfer, while the tilting mechanism provides smooth, controlled metal discharge with minimal turbulence. These features prevent oxide entrainment and ensure that the molten aluminum remains clean, stable, and suitable for high‑performance casting applications.
Yes — the GM‑J Series is specifically engineered for continuous, high‑volume aluminum melting. Its large melting chamber, efficient burner system, and durable refractory lining support long operating cycles with minimal downtime. The furnace’s tilting feature allows rapid, controlled metal discharge, making it ideal for feeding die‑casting machines, ladle‑pouring stations, or automated casting lines. Facilities that require a steady supply of molten aluminum benefit from the GM‑J Series’ ability to maintain consistent temperature and melt quality during extended production runs.
Yes — GM‑J Series aluminum tilting reverberatory melting furnaces are available throughout the United States, Canada, and Mexico. Foundries, die‑casting plants, and aluminum processors across North America rely on these furnaces for high‑capacity melting, reduced fuel consumption, and consistent metal quality. Regional availability ensures faster delivery, dependable technical support, and access to replacement parts. Units can be configured with various capacities, burner systems, refractory options, and automation packages to meet specific production requirements.
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