Custom air handling units offer significant benefits over standard commercial grade units. Average design life is increased from less than 15 years to more than 30. Average cabinet leakage is reduced from 5% of design CFM at 5″ of static pressure, to 1% of design CFM at 10″ of static pressure. Custom units are more flexible than standard units and offer factory piping, wiring and optional factory sound, lead and performance testing. In addition, a three-year cost comparison shows a savings of over $40,000.

Several factors must be considered when reviewing a purchase of a custom air handler. Following is a list showing a few common rules of thumb when considering a custom air handling solution.

Standard Commercial Grade Unit:

Average cabinet leakage can exceed 5% of design CFM at no more than 5” of static pressure.
Less dimensional / footprint flexibility results in lost and unusable space.
Factory piping options not typically available.
Factory installed, piped, or tested humidification not available.
Factory sound, leak, and performance testing of assembled units not available.
MarCraft Custom HVAC System:

Average design life with proper maintenance estimated at 30+ years. Buy commercial grade units twice or a custom unit once. Not only do you have the cost of the unit but also the cost of the install.
Average cabinet leakage does not exceed 1% of design CFM at over 10” of static pressure. Less leakage means more BTU’s in the building ductwork and not wasted in the mechanical space or outdoors in the case of rooftop units.
Very flexible since each unit is a clean sheet of paper design. Units can be U-Shaped, T-Shaped, L-Shaped, round, columns in the air tunnel, stack, or nearly any other shape required to fit the project requirements. Build a building or renovate a space, use odd shaped units to gain more usable floor space.
Factory piping is available. This saves the high cost of field piping and reduces the risk of air leaks in the unit casing around pipe connections.
Full factory wiring to a single electric feed available, which saves money on electrical installation cost.
Optional factory sound, leak, and performance testing of assembled units before shipment. This saves critical time and field labor on site.
Building custom units is like having two construction sites at once. Unit can come completed with piping, wiring, controls, etc, ready for simple hook-up to utilities and you basically turn the system on.

From the first engineering design to system start-up, attention to detail is what separates MarCraft from the competition. Our experienced in-house engineering team stands ready to solve any design and performance questions. We don’t rely on programs or fancy software to take the place of experienced engineers who design each system from a clean sheet of paper. MarCraft’s dedicated manufacturing team takes great pride in producing a high quality unit. We also run each custom HVAC system through rigorous testing prior to shipment to ensure it works to exact specifications. Every last detail is followed, right down to using heavy-mil shrink-wrap on all sections during shipment. Our number one job is to serve you and provide the highest quality custom HVAC system possible.


MarCraft™ custom HVAC units can be designed to meet any project’s unique needs by providing the following:

  • Unmatched HVAC application engineering expertise
  • Flexible Layouts and Capacities to solve the toughest challenges
  • High Quality
  • Long Life and Minimal Maintenance
  • Reliability
  • Efficient Operation
  • Budget Based Custom Solutions

MarCraft units are capable of incorporating other devices or features, a benefit often not available in commercial grade equipment. Features such as energy recovery, high particulate filtration, stacked units, special footprints, chillers, boilers, electrical gear and construction materials are all items which can be considered.

Before you start your next project, design study, or design-build project, contact the MarCraft Division of Arizon Companies for information and application assistance.