The Rapid 2000 Series is a range of direct fired air handlers capable of building heating and pressurization, up to 40,000. They are designed to efficiently establish and maintain a slightly pressurized condition in your building by delivering heated or cooled outdoor air. Slight pressurization is desired for reduction of unwanted air infiltration. Exhaust and fume extraction systems can improve along with increased indoor air quality (IAQ) and temperature distribution. Four types of operation are available, all with their own benefits and advantages based on building requirements.


2000-Series air handlers cater to budget-conscious customers looking for a comprehensive list of options at an affordable price. Commercial grade unit construction separates itself from the additional cost associated with heavy-duty welded cabinets. 

 The Four Styles

The Make-Up Air (MUA) unit is the simplest operation option. MUA units bring in 100% outside air, heat it to the desired setpoint and deliver it to the conditioned space. It supplies direct heated replacement air to make-up for building mechanical exhaust.  This option is ideal for any building with exhaust fans, units can interlock with fans to only operate when exhaust fans are operating.  Ideal for buildings with processes that require exhaust fans, vehicle maintenance/automotive repair, welding shops, commercial kitchens, and restaurants.


The Fixed Recirculation (FR) systems always uses 20% outside air and 80% return air. This air handler operation is ideal for buildings that require a lower fixed volume of outdoor air for code compliance or other reasons.  Since all direct-fired heaters require a minimum of 20% outside air while in operation, this is the most energy efficient operation with the least allowable amount of outside air and the most recirculation.


Variable Air Volume (VAV) units are perfect for buildings that require a varying outdoor air ventilation load but don't want to recirculate air from within the space.  VAV is similar to MUA since the unit is always providing 100% outdoor air, however, VAV units are equipped with a variable frequency drive to provide for an air volume reduction of up to 50% for energy savings when less make-up air is required in the space.


The Air Management (AM) unit controls the outdoor air / return air ratio to adjust to variations in indoor air temperature and indoor building pressure conditions.   The system can continuously vary from 20% outside air with 80% recirculation for maximum fuel efficiency to 100% outdoor air with no recirculation for maximum make-up air and pressure recovery.   Air Management (AM) option can automatically adjust (no need for interlocks) to intermittent and unplanned building pressure or IAQ changes from intermittent building processes, exhaust operations, and opening/closing doors.  Ideal for buildings with multi-functional spaces with varying conditions or varying occupancy periods throughout the day.   Ideal for manufacturing, transportation and logistics hubs, distribution centers and more.


 Benefits and Features

All models and styles are available in upright or horizontal installation positions, as well as indoor and outdoor configurations. There are many benefits to using direct-fired air handlers, which include:

  • Automatic management and control of Indoor Air Quality (IAQ), Temperature and building pressure.
  • 100% efficient direct-fired combustion for low operating cost.
  • Outdoor Air/Fresh Air code compliance.
  • Improve performance of building exhaust systems.
  • Augment existing ventilation system
  • Building comfort, consistent space temperature

 Quality Construction

Our machines are constructed with long-lasting parts to ensure high quality and effectiveness. We use:

  • Corrosion-resistant, galvanized steel cabinetry. 
  • Sturdy, screwed and bolted cabinet construction.
  • Powder coat painted cabinet option. White painted exterior with gray painted interior.
  • Heavy-duty, factory-installed motor and drive package with pre-lubricated bearings.

Additionally, all 2000 Series come complete with low-temperature automatic shutdown, a 7-day time clock, space temperature control for added comfort, remote control panel with burner and blower switches for easy operation and mild weather stats.

 Rapid Engineering's Guarantee 

Since the 1960's, Rapid Engineering has led the industry with innovations and unequaled commitment to customer satisfaction. Our products are found in a variety of industries, including factories, warehouses, waste water treatment plants, transportation & distribution, vehicle maintenance facilities, locomotive manufacturers and automotive manufacturers.

We've been helping customers purchase and design their perfect air handler for over 50 years. For more information on our 2000 Series of commercial air handlers or to speak with a Rapid Engineering product expert, please contact us.