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GFS' direct gas fired Air Makeup Units provide an economical source of replacement air and are furnished with heater, filters, motor/ blower, controls, mounting hardware, and auxiliary equipment.
Air replacement systems replace contaminated air exhausted from industrial and commercial buildings or spray booths, with fresh, heated outdoor air, maintaining a constant leaving-air temperature regardless of the incoming, outdoor-air temperature. Air replacement systems replenish equal amounts of fresh air for every cubic foot of air exhausted.
A direct-fired burner with a turndown ratio of 30:1 that is 100% efficient - all the heat goes directly into the airstream. The high turndown capability allows the flame to adjust to wide, outdoor-air temperature swings throughout heating season. For example, a unit with a maximum temperature rise of 90° in the winter can adjust down to as little as a 3° temperature rise for milder spring and fall weather
Constant Volume System (100% Replacement)
The constant volume system provides a consistent rate of supply air to the facility. The Direct-Fired air system heater warms the fresh air on intake, eliminating energy losses associated with alternative heat sources. In most applications, the intake air is of slightly higher volume than the exhausted air, resulting in a positive building pressure for best results. However, these units can be adjusted to intake less volume than the exhaust for applications requiring a negative building pressure.
Variable Air Volume System
When air replacement requirements fluctuate and Constant-volume or Two-Speed systems are not suitable, a Variable Air Volume System is the solution. By integrating a Variable Frequency Drive into the motor system, automatic adjustments can be made to the system during operation to compensate for changing conditions. Several options are available to control these adjustments:
For those operations requiring re-circulating capability, an 80/20 system can provide energy-efficient make-up air and heating functions. By drawing at least 20% outside air, and up to 80% re-circulated air from the building, the 80/20 system reduces the energy needed for heating. The ratio of new-to-re-circulated air varies according to the requirements of the building environment. Automatic sensors and pressure monitors continually adjust to maintain the most consistent working environment, the most efficient operation and lowest operating cost. These units can be configured as a fully functional building heat unit, a supplementary air make-up unit, or as a combination of both.
During Spray Booth Operations
A spray booth’s exhaust system is removing significant quantities of shop or plant air. A typical 10’ x 8’ x 6’ spray booth may exhaust more than 8,000 cubic feet of air per minute. If replacement air is pulled directly from outside, this volume may be sufficient to cool the interior of the building and may adversely affect the quality of coatings. An air replacement system may be required, using an air replacement unit which supplies conditioned and filtered air to the booth, minimizing temperature variations and removing particulates that compromise finish quality.
In the case of pressurized spray booths, air replacement is introduced directly into the spray booth, eliminating the need for air to be drawn from the facility. This allows for greater control over the temperature and filtration quality in both the facility and the spray booth environment, therefore improving working conditions and lowering overall operating costs.
Variable Speed Unit:
The air replacement unit is designed with a variable speed drive/motor and damper package to discharge either 140°F or 160°F air for accelerated curing cycle. This design reduces airflow 50% during the curing mode. This system always uses outside air during the cure mode to ensure good clean air for the cure cycle. This system also includes an auto-balance system with a variable frequency drive to automatically adjust the airflow of the exhaust fan(s), to ensure proper booth balance, not only during the curing mode but during the painting mode as well.
The air replacement unit is designed with a variable speed drive/motor and damper package to discharge either 140°F or 160°F air for accelerated curing cycle. This design recirculates up to 80% of the air while exhausting 20% to atmosphere. This design provides further energy efficiency through the recirculation of heated air, requiring less for the heating unit. This system also includes an auto-balance system with a variable frequency drive to automatically adjust the airflow of the exhaust fan(s), to ensure proper booth balance, not only during the curing mode but during the painting mode as well.
Clogged Filter Switch with Light: Senses air pressure drop across the filter, and is mounted in unit. When the filter becomes dirty, the switch activates a remote control panel light, indicating a required filter change.
Dual-Range Selector Dial, 90°-140°F, 401M: Allows for two, separate discharge temperature set points for spray and dry modes in both paint booth applications.
High Temperature Option: Adapts unit with special construction and controls to high temperature paint-booth and industrial-process heating applications.
Low Gas-Pressure Switch: Stops unit’s operation when inlet gas pressure goes below set point. Standard on FM manifolds over 2,500 MBTU and on FIA (IRI) manifolds over 150 MBTU.
Pressure Gauge 0-15#, 0-35”: Monitors supply pressure to unit, or to burner on gas manifold. Reads low gas pressures between 0 and 15”; 35”.
Low-Temperature Blower Shutdown with Bypass Timer: Shuts blower off if discharge temperature drops below 40°F for longer than five minutes.
GFS guarantees that our products meet or exceed all of the applicable codes related to the equipment. Our engineers regularly follow and contribute to the advancement of codes and standards that affect the industries that we work in. One of our engineers currently serves on the NFPA Technical Committee on Finishing Processes, a key standard in the finishing industry.
Let us know your product requirements, and we will put you in touch with a distributor in your area.
Disclaimer: Product configurations are subject to change without notice