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MAKE UP AIR

Over the past few years we have been building our portfolio of products to offer a full offering of high outside air make up air units of up to 100%. Starting as low as 100 cfm and legitimately up to 20,000 cfm (although higher with custom or multiple units) we can do brute force (no return connection) or energy recovery (with options). Incidentally, 100% outside air units can be set up for up to 100% mechanical heating and cooling (ie recirculating and increase outside air up to complete make up air).

One thing to consider: Make Up Air applications are very different from standard recirculation units as in the northeast the air entering the unit can be as low a 0F up to 100 vs 55-80. Additionally, unlike recirculating air units where the entering air is the same as the sensor (ie the t-stat is in space that you are in), the air for 100% outside air units is not where the occupant is. Therefore, the controls must be closely looked at as simple controls may prove problematic. For example, on a 0 degree day, the dedicated outside air system will see 0 but the space may be 70F. If the space is satisfied you can’t turn the outside air processing unit off as you will deliver freezing air into the space. You also can’t send 95F to space when it is satisfied. For cooling it gets more complicated as not only does one need to consider temperature, but humidity levels as well (see dehumidification and hot-gas reheat, etc)

Here Is A Quick Summary For Easy Reference:

  • Heating Only (direct fired, indirect fired gas heat, hot water, steam, electric)
  • Cooling Only or with heat
  • HVAC units with energy recovery
  • Energy Recovery only
  • Units under 1000 cfm
  • Indoor Packaged units- air source and water source
  • Retrofit ideas

Heating Only 100% : Rupp offers Direct and indirect units, indoor and outdoor. Full modulation heat and industry leading lead times. Competitively priced.

Heating with Small CFM: We offer UL listed electric duct heaters which run cooler, allowing more kw/sq foot which equates to higher delta T’s Have You seen This? Neptronic CMD all in one Fan Powered Electric MUA Unit (indoor 200-750 cfm)!

Cooling only (with heating options) : We offer multiple options as every application is different. We can do 100% outside air, brute force or incorporate an integral molecular sieve wheel to cut the mechanical load by up to 40%. The 100% outside air unit can ship with full controls and a premium dehumidification cycle using modulating hot-gas reheat. The same packaged unit can incorporate primary heat with high turndown gas burners, hot water, steam or electric. Need an indoor solution? We can configure a United Cool Air Vertical or Horizontal unit to bring 100% outside air down to neutral air temperatures.

Industrial HVAC systems with energy recovery. Again, an allow us to incorporate with an integral molecular sieve wheel for full Cooling, Heating and dehumidification. Need a lower dewpoint? The NovelAire DES/DX ERV utilizes the same wheel and a commercial grade desiccant wheel to provide dewpoints as low as 40. In some cases a heat pipe wraparound coil can clip 25% off the load by using the sensible heat of the outdoor air as reheat as shown here. (this concept can be used for retrofit applications too)

Energy Recovery only. We can offer a wheel only, heat pipe, fixed core units, or regenerative energy recovery (Dual Core & Microblock) The energy recovery can be standalone or part of a dedicated outside air system. The AldesMetro series has a small footprint and can be matched to individual units to allow individual control.

Semi-Custom and Built to Order HVAC Units: Bousquet offers 95% indirect gas fired heat, complete packaged DX as well as the full choice of energy recovery options.