CTM-TB Series Fully Custom Air Handling Units
Mainstream’s CTM-TB Custom AHUs adapt well to duties requiring ultimate design flexibility, such as pharmaceutical, research laboratory, and healthcare facilities. Specialized options include integral desiccant wheels, runaround heat recovery coils, heat pipe coils and air-to-air heat exchangers.
Bolted design makes CTM-TB Custom AHUs perfect for retrofit situations where access is limited and knock-down construction is required.
By simply removing bolts, the panels can be disassembled and re-assembled without compromising the extremely low air leakage rate.
Quality and reliability are no better than the component subsystems, and here we exceed your requirements with the best in fans, control dampers, coils, humidifiers and heat recovery systems. We commonly mount customer-supplied controls according to specific customer requirements.

The assembled AHU is encased in a no-through-metal thermal break for energy savings and absolutely minimal condensation.
Features
- Bolted construction (eliminating sheet metal screws between adjacent panels) with a lifetime ultra-low leakage membrane seal
- Baked electrostatic powder coat finish on exterior, with optional anti-microbial powder coat interior
- High-density, enviro-friendly polyurethane foam injected insulation, up to R-26
- Complete, no-through-metal thermal break construction with no compromise at floor-to-wall and roof-to-wall joints
- Standard dual-gasketed access doors with roller-cam latch mechanisms
Benefits
- Easy retrofitting into constricted footprints, yet with no-leak air flow integrity
- Reduced-maintenance finish with no opportunity to host microbial growth
- No through-metal, through-casing thermal break—limits conduction and infiltration/exfiltration for more energy-efficient operation
- Tight seal and sure-close, freeze resistant door fixtures
Custom Components And Options

Fans
- Belt-Drive or Direct-Drive Plenum
- Centrifugal DWDI Scroll Housing
- Dual or multiple fan configurations
- Protective screens and OSHA belt guards
- Extended lubrication lines
- Isolation bases w/seismic restraint
- Premium efficiency ODP, TEFC, or XP motors
- Factory mounted and wired VFD’s

Control Dampers
- DWDI Centrifugal, SWSI Plenum, Vaneaxial
- Ultra-low leakage, aluminum airfoil blade dampers
- Electric or pneumatic actuators, factory or field installed
- Outside air hoods with integral moisture eliminators
- Air flow measuring devices
- Multi-zone discharge configurations

Filters
- Pleated panel pre-filters
- Pocket or cartridge type hi-efficiency filters
- HEPA filters with gel-seal frames
- Galvanized, stainless steel and aluminum frames
- Optional stainless steel frames
- Dial or digital type filter gauges

Coils
- Water, steam and direct-expansion coils
- Optional coatings for corrosion protection
- Stainless steel, triple-sloped drain pan under cooling coils
- Stacked coils mounted on racks to allow individual removal

Humidifiers
- Stainless steel multiple-tube dispersion
- Optional short-absorption distance design

Heat Recovery
- Heat pipe coils
- Runaround coils
- Air-to-air plate heat exchanger
- Enthalpy wheels
- Bypass dampers
Controls
- Variable Frequency Drives
- Disconnect Switches and Enclosures
- Sensors
- Single-point power connection
