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Even with the multiple sizes available, there are occasions that our standard wall-mounted HVAC systems aren't a perfect fit for the application. For these, we offer several additional configuration options in our InPac and AirPak product lines.

  • InPac systems are available in roof mount, pad mount, or split condenser/evaporator configurations along with a number of add-on and Dual Unit Plenums. 
  • AirPaks can be ordered with upblast plenums.

Both product lines can be manufactured in a reverse airflow configuration as well, which moves the return air to the top and supply air down lower on the wall mounted cabinet. This configuration is particularly useful in high heat load applications such as VFD buildings.

Specific Systems alternate configurations utilize the same industrial grade components as our standard vertical wall mounted HVAC systems. This continuity of parts gives us the ability to quickly provide drawings during the design phase as well as provide any parts even years after the sale.

InPac

Specific Systems InPac Roof Mount ConfigurationRoof Mounted

Specific Systems roof mounted InPac systems are typically horizontal in design. The systems are mounted to a skid, and our engineering team will work with you to meet the specifications of the roof curb on your building.

The supply and return can be independently arranged prior to manufacture to meet the needs of the application to flow through the end, sides, or bottom of the industrial HVAC system. 

Specific Systems InPac Pad Mount ConfigurationPad Mounted

As one of our most popular options, pad mounting is best used on permanent structures and when wall space is at a premium. The included duct mate flanges help minimize wall perforations and let you choose points of entry that meet the requirements for each building individually, which works even better on the larger 35-50 ton unit sizes.

Pad mounted systems can be ordered in a vertical arrangement similar to our standard configuration or a horizontal configuration similar to the roof mounted units, but with the following changes:

  • Duct mate connections instead of flush mounted supply/return grilles
  • Interior unit controls moved to NEMA 4/4X/7 rated remote panel
  • Other electrical components moved to NEMA 4/4X/7 rated panel on the unit

Like the rooftop versions, pad (or slab) mounted InPac systems are mated to a hot-dipped galvanized steel skid with industrial strength combination lifting/mounting lugs.

InPac Split SystemSplit System

Much like a typical residential HVAC system, InPac environmental control units can be ordered in a configuration that separates the condenser and evaporator sections for mounting in different areas of an enclosure.

Like the example shown here, split systems can be ordered with different materials to match the corrosion resistant needs of the application.

InPac Walk-In PlenumWalk-in Service Plenum

Particularly useful when installed on a blast-resistant building, the walk-in plenum option gives you the ability to place a blast damper in the wall, helping to prevent unnecessary cutouts while maintaining the safety requirements for these hazardous applications.

Service plenums are designed to provide a fully insulated area for the supply air above the area where the controls are housed.

All interior components can still be accessed through removable panels inside the service plenum, just as with our standard vertical wall-mounted design.

Upblast Plenum

Upblast plenums are commonly used when air is being ducted inside the building and the ducts are above cable trays. Our modular design allows the blowers to be easily configured during manufacture to move air upwards into either an attached plenum or exterior ductwork.

Each plenum is manufactured from the same material as the base system, and includes integrated turning vanes and insulation which also helps to improve sound levels from the supply air.

Call us for additional information on this commonly ordered option.

Specific Systems InPac Reverse Airflow ConfigurationReverse Airflow

Our reverse airflow configuration moves the return air to the top of the unit, while the supply air is relocated lower in the cabinet.

As mentioned at the top of the page, this configuration can help maintain dynamic airflow in the enclosure since heat naturally rises. In high heat load applications like VFD buildings, much of the heat is exhausted through tops of the enclosure, with cool air designed to be drawn in from the bottom of the process controls inside the building.

AirPak

Specific Systems AirPak Reverse Airflow ConfigurationReverse Airflow

As with the InPac line, our AirPak reverse airflow configuration moves the return air to the top of the unit, while the supply air is relocated lower in the cabinet.

This configuration can help maintain dynamic airflow in the enclosure since heat naturally rises. In high heat load applications like VFD buildings, much of the heat is exhausted through tops of the enclosure, with cool air designed to be drawn in from the bottom of the process controls inside the building.

Like the AirPak models with the upblast plenum, AirPaks with reverse airflow utilize an industrial grade dual shafted evaporator motor with two forward curved blowers instead of the standard backwardly inclined impellers.

AirPak Upblast Plenum, 2 shades of brownUpblast Plenum

On the AirPak product line, the upblast plenum works in the same manner as that on the InPac line, by rotating the blowers to the move air through the top of the cabinet into a plenum that typically connects to ductwork higher in the building.

While our standard AirPaks use backwardly-inclined impellers in the evaporator, the difference in the upblast is the use of a dual-shafted evaporator motor with forward-curved blowers, the same style as in the InPac product line. 

While not as common, the plenum can be used in conjunction with our reverse airflow configuration to bring return airflow down through the top of the unit.

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