Sinteco Air Handlers: Engineered for Hygienic, Process-Critical Environments
In food processing, pharmaceutical production, healthcare, microelectronics, and other controlled environments, an air-handling unit must do more than maintain temperature and humidity. It must support sanitation procedures, resist corrosion, drain completely, minimize microbial retention, and maintain reliable environmental conditions throughout the production cycle.
That is the design philosophy behind the hygienic air handlers offered by Sinteco Americana. Rather than adapting a conventional commercial AHU to a sanitary application, Sinteco builds its Hygiene® units around cleanability, wash-down resistance, process control, and application-specific construction.
The result is a customizable family of air handlers ranging from economical monolithic-panel units for dry environments to fully welded stainless-steel systems designed for strong, frequent sanitation.
A Process Air Handler, Not Just a Comfort-Cooling AHU
A conventional commercial AHU is typically selected around airflow, external static pressure, entering and leaving air conditions, heating and cooling capacity, filtration, and acoustics. Those parameters remain important in a process air-handling system, but they are only part of the engineering problem.
A hygienic or process AHU may also need to address:
Microbial and particulate contamination
Condensation inside the casing
Standing water after sanitation
Corrosion from cleaning chemicals
Low-temperature operation
High-humidity production rooms
Ultra-low humidity or dew-point requirements
Frequent foam cleaning or wash-down
Cleanroom pressurization
Product-specific temperature and moisture profiles
Access for validation, inspection, and maintenance
Sinteco provides air-treatment systems, cleanrooms, hygienic air-handling units, air-distribution plenums, metallic duct systems, textile duct systems, and other process-air components, allowing the AHU to be engineered as part of a complete production environment rather than treated as an isolated piece of mechanical equipment.
The Sinteco Hygiene® Rating System
One of the most useful aspects of the Sinteco product line is its tiered construction system. Engineers can match the AHU’s materials and washability to the sanitation risk of the space instead of specifying the most expensive construction for every application.
AHU ★: For Dry, Lower-Risk Areas
The AHU ★ uses a monolithic polyester and polyurethane or Styrofoam panel construction with galvanized components. Published information identifies a nominal 43 mm panel in the current product-category overview, while the individual product page identifies available construction thicknesses from 43 to 83 mm depending on the configuration. Corners are sealed, and the modular monoblock design can be customized for complex installations.
This tier is intended principally for dry-cleaned spaces that do not require intensive hygienic treatment, including:
Cartoning rooms
Picking areas
Packaged-product storage
General industrial process spaces
Support areas outside primary wash-down zones
The ★ unit is designed for limited or occasional dry cleaning without water. Its monolithic-panel approach provides a more continuous casing than conventional low-thickness, field-jointed panels with aluminum posts.
AHU ★★: Hygienic Monolithic Construction
The AHU ★★ moves into more demanding hygienic applications. Its published construction consists of high-thickness monolithic polyurethane/polyester panels with stainless-steel internal supports. The current product overview lists a 63 mm polyester and Styrofoam panel and an open plug fan mounted on a welded stainless-steel support structure.
Important features include:
A factory-provided machine base
Rounded internal corners
Seamless monolithic sandwich walls
Stainless-steel internal supports
Reduced thermal bridging
Internal lighting
Electrical connections between the motor and control or regulation panel
Optional safety interlock on the fan access door
Optional sloped bottom surface
Compatibility with low-pressure, foam-based cleaning
Construction suitable for reuse or relocation
The optional sloped bottom is especially important in applications where condensation or cleaning liquids could otherwise remain inside the unit. The ★★ construction is appropriate for facilities needing a higher level of hygiene and low bacterial retentiveness without requiring an entirely welded stainless-steel casing.
AHU ★★+: Stainless-Steel Drainage Where It Matters Most
The AHU ★★+ is a hybrid between the ★★ monolithic-panel unit and the fully welded ★★★ system. It uses polyurethane/polyester walls and ceiling, paired with a sloped TIG-welded stainless-steel bottom insulated with sprayed polyurethane.
Published features include:
A single-sloped stainless-steel bottom
Drainage for condensate and wash water
High-thickness monolithic walls
Rounded internal corners
An insulated integrated base
Reduced thermal bridging
Low bacterial-retention construction
Compatibility with frequent low-pressure foam cleaning
Reusable construction
For many food and beverage projects, the ★★+ may offer an effective balance between first cost and sanitation performance. Stainless steel is concentrated at the floor of the unit, where water, residue, and cleaning chemicals present the greatest risk, while the walls and roof retain the economical monolithic polyester construction.
AHU ★★★: Welded Stainless-Steel Hygienic Construction
The AHU ★★★ is designed for highly hygienic applications requiring strong and frequent cleaning. The casing uses a smooth, TIG-welded stainless-steel internal structure with sprayed polyurethane insulation. Published data identifies 1.5 mm stainless-steel skins and polyurethane insulation between 70 and 150 mm, depending on the project. The sprayed polyurethane has a published density of approximately 40 kg/m³.
Key construction and service features include:
Smooth TIG-welded stainless-steel interior
Open plug fan on a welded stainless-steel support
Double-sloped bottom surface
Rounded internal corners
Stainless-steel condensate drain and siphon
Removable coils
Removable or suspended internal components
Clear, accessible casing bottom
Multiple stainless-steel access doors
Heavy-duty stainless-steel locking mechanisms
Fan-door safety interlock
Insulated base with integrated feet
Strong corrosion resistance
Compatibility with high-temperature foam cleaning
Published 10-year casing guarantee
Ability to suspend the unit from a supporting structure when properly engineered
The suspended-component arrangement is particularly significant. By keeping internal components off the AHU floor, the casing bottom remains more accessible for inspection, cleaning, rinsing, and drainage. This reduces hidden surfaces and difficult-to-reach areas where moisture or process residue could accumulate.
AHU ★★★★: Stainless Steel Inside and Out
The AHU ★★★★ extends the TIG-welded stainless-steel construction to the exterior surface. Published construction includes 1.5 mm TIG-welded stainless steel, 70 to 150 mm of sprayed polyurethane insulation, and an open plug fan supported by a welded stainless-steel structure.
The ★★★★ tier is intended for the strongest and most frequent wash-down environments, including installations where both the interior and exterior of the AHU are exposed to moisture, cleaning chemicals, or aggressive production-room conditions.
Quick Engineering Comparison
Model | Primary construction | Published panel or insulation | Fan configuration | Washability |
AHU ★ | Polyester/PU or Styrofoam with galvanized construction | 43 mm shown in product overview; configurations up to 83 mm are published | Plug-fan arrangement | Limited, primarily dry cleaning |
AHU ★★ | Monolithic polyester/PU with stainless-steel supports | 63 mm published | Open plug fan with welded stainless support | Occasional to frequent low-pressure foam cleaning |
AHU ★★+ | Polyester/PU walls with TIG-welded stainless bottom | 63 mm wall construction published | Open plug-fan architecture | Frequent cleaning |
AHU ★★★ | TIG-welded stainless-steel interior with sprayed PU | 1.5 mm stainless steel; 70 to 150 mm insulation | High-efficiency open plug fan | Strong and frequent cleaning |
AHU ★★★★ | TIG-welded stainless steel inside and outside | 1.5 mm stainless steel; 70 to 150 mm insulation | Open plug fan with welded stainless support | Strong and frequent cleaning |
These published values describe the standard construction hierarchy. Final casing thickness, insulation, stainless-steel grade, airflow, fan selection, coil configuration, filtration, pressure class, controls, and dimensions must be confirmed in the project-specific selection and submittal.
Available Air-Treatment Configurations
The Hygiene® product range can be configured for more than basic heating and cooling. Published configurations include:
Dehumidification
Free cooling
Energy recovery
Humidification
Exhaust-air service
Filtered-air recirculation
High-humidity conditioning
Low-temperature operation
Ultra-low-humidity process applications
These options allow engineers to develop a process-air system around the actual production profile rather than attempting to force a standard packaged AHU into an unsuitable operating envelope.
High-Efficiency Air Cleaning
The Sinteco Hygiene® Air Cleaner is manufactured in TIG-welded stainless steel and can be equipped with filtration ranging from F7 through H13. It uses a high-efficiency plug fan, a double-sloped bottom, rounded internal corners, and wash-down-capable construction. Optional injected-polyurethane insulation is also available.
For cleanroom or pharmaceutical applications, engineers should verify the required filter classification, face velocity, initial and final pressure drop, filter-seal arrangement, scan-testing provisions, access clearances, and fan reserve before specifying the final filtration system.
Low-Temperature Applications
Sinteco publishes specialized hygienic systems for low-temperature rooms. Its Low Temperature product line includes configurations developed for environments down to approximately -20°C and specialized systems down to -50°C. Available designs incorporate thick polyurethane insulation, removable internal components, stainless-steel drainage, high-efficiency fans, and filtration options from F7 through H13.
Certain -50°C configurations use galvanized-steel coils with CO₂ refrigerant and either water or hot-gas defrost. The second-series construction identifies minimum 2 mm TIG-welded stainless-steel casing material, while another configuration uses approximately 200 mm polyester and Styrofoam walls with a welded stainless-steel bottom.
High-Humidity Maturation and Cheese Applications
The Fromagerie configuration is designed for low-temperature, high-humidity applications such as cheese maturation. Published operating examples include approximately 4°C and 98 percent relative humidity. The unit can be constructed entirely from stainless steel, including the casing, fans, coils, and accessories, and can be compatible with clean-in-place procedures.
Ultra-Dry Process Rooms
For moisture-sensitive production, Sinteco offers specialized dehumidification and low-humidity configurations. Published information for the SIMUN system identifies absolute-humidity capabilities around 0.1 to 0.2 g/kg of dry air, while the specialized Low Temperature product overview references conditions as low as 0.01 g/kg for a specific application class. Those values are highly application-dependent and should not be treated as universal leaving-air guarantees without a complete psychrometric and regeneration-energy analysis.
Why Sinteco Can Outperform a Conventional Competitor
No manufacturer is automatically “better” for every project. A commercial office AHU, for example, may not need welded stainless steel or wash-down construction. In hygienic and process-critical environments, however, Sinteco offers several meaningful design advantages over conventional jointed-panel equipment.
1. Fewer Sanitation Weak Points
Traditional AHUs often use aluminum posts, mechanical panel joints, plastic components, exposed fasteners, and silicone-sealed internal corners. These features can create crevices, uneven surfaces, and maintenance points.
Sinteco’s higher-tier units replace those interfaces with monolithic panels or TIG-welded stainless steel, rounded corners, sloped floors, and smoother internal surfaces. The design is intended to reduce bacterial retention and improve access for sanitation.
2. Drainage Is Designed Into the Casing
A drain pan beneath a cooling coil is not the same as a fully drainable AHU interior. The ★★+, ★★★, and ★★★★ configurations incorporate sloped or double-sloped casing bottoms to help move condensate and cleaning liquid toward the drain.
3. Better Alignment With Wash-Down Procedures
Higher-tier units are specifically designed for frequent foam-based cleaning, including strong cleaning regimes and elevated temperatures on the ★★★ and ★★★★ models. This is a substantial distinction from commercial units that may tolerate only wiping, vacuuming, or limited coil cleaning.
4. Reduced Condensation Risk
Sinteco emphasizes monolithic construction and the reduction or elimination of thermal bridges. In cold or high-humidity applications, this can reduce the likelihood of casing-surface condensation when the unit is correctly selected and installed.
5. Application-Specific Customization
Sinteco hygienic AHUs are make-to-order systems customized around project requirements. This approach is especially valuable when engineers must coordinate unusual room conditions, production schedules, sanitation cycles, low dew points, atypical refrigerants, or restricted installation geometry. [sinteco.com]
6. Maintainability and Lifecycle Value
Removable coils, suspended internal components, multiple access doors, internal lighting, stainless-steel locks, integrated bases, and reusable construction can simplify inspection and major service work. These features may also extend useful casing life in facilities where corrosion and repeated sanitation rapidly degrade conventional equipment.
Information Engineers Should Request During Selection
The published product information provides a strong construction overview, but it does not establish one universal performance schedule for every custom unit. A complete engineering selection should document:
Supply, return, exhaust, and outdoor airflow
External and internal static pressure
Fan type, quantity, speed, motor efficiency, and absorbed power
Fan array redundancy and turndown requirements
Entering and leaving dry-bulb and wet-bulb conditions
Heating and cooling capacity
Coil tube, fin, casing, and drain-pan materials
Coil face velocity and airside pressure drop
Water, glycol, refrigerant, steam, CO₂, or other utility conditions
Filter class, arrangement, pressure drop, and terminal resistance
Casing leakage, deflection, thermal-transmittance, and thermal-bridging classifications
Stainless-steel grade and surface finish
Insulation thickness and density
Drain slope, outlet size, trap requirements, and sanitation procedure
Access-door dimensions and component-removal clearances
Sound power by octave band
Vibration-isolation requirements
Electrical characteristics and disconnecting means
Control sequence, sensors, safeties, alarms, and BAS protocol
Factory testing, commissioning, validation, and documentation requirements
If the project references EN 1886, EN 13053, ISO cleanroom requirements, food-safety programs, or owner-specific sanitation standards, the required performance classes should be explicitly stated in the schedule and verified in the manufacturer’s project submittal. Sinteco’s public literature describes the construction features, but project-specific certification and performance classes should be confirmed rather than assumed.
The Bottom Line
Air handlers stand apart where cleanability, corrosion resistance, precise process conditions, and sanitation access are central design requirements.
The broad Hygiene® construction hierarchy lets engineers select an appropriate level of protection, from economical monolithic polyester panels to fully TIG-welded stainless-steel interiors and exteriors. Features such as plug fans, thick insulation, reduced thermal bridging, sloped bottoms, rounded corners, removable components, high-efficiency filtration, and wash-down-compatible construction directly address problems that conventional commercial AHUs are not always designed to solve.
For food, pharmaceutical, healthcare, microelectronics, low-temperature, high-humidity, and ultra-dry applications, this process-centered design can deliver meaningful advantages in sanitation, maintainability, product protection, and long-term reliability.
Before issuing a specification, engineers should obtain a project-specific equipment selection that confirms psychrometric performance, airflow, pressure, fan energy, filtration, casing characteristics, material grades, sanitation compatibility, acoustics, controls, and applicable certifications. That final selection is what turns Sinteco’s hygienic construction platform into a fully engineered process-air solution.
