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Refrigeration Evaporators

Custom Evaporators - Spiral & IQF Evaporators


Colmac Coil is a world leader in the design and manufacturing of heat exchanger coils that are used in cooking, chilling, and freezing applications. Our unique offering of tube and fin patterns coupled with our wide range of tube and fin materials allows us to meet the needs of virtually any food processing application. We work closely with original equipment manufacturers (OEM), and installing contractors in the food processing industry to meet the most stringent requirements. Corrosion resistant construction for coils subjected to harsh cleaners such as sodium hypochlorite and/or potassium hydroxide are available. Colmac Coil anti-microbial coil construction actively kills pathogens such as E-coli, Listeria monocytogenes, and Salmonella, which come in contact with the fins. Other Colmac Coil innovations for the food processing industry include 3-A Sanitary Design hygienic evaporator coil designs for the dairy industry which have been inspected by the USDA and approved for use in the cheese processing industry. We can custom design your chilling or freezing coil using any working fluid in a variety of configurations to best suit your needs. Coils can be arranged for Gravity Flooded, Pumped (Liquid Overfeed), Direct Expansion (DX), or Brine operation.

Spiral 1
Spiral 2
Spiral 3
Spiral 4


  • Halocarbons (HFC)
  • Ammonia
  • Carbon Dioxide (CO2)
  • Propylene Glycol/Brine
  • Low Temperature Fluids (d-limonene, Dynalene™, Tyfoxit™, etc)


  • Tube Materials: Copper, Aluminum, Stainless steel (304L, 316L, AL6XN), Hot dip galvanized steel
  • Tube Diameters: 3/8”, 5/8”, 7/8”, 1”
  • Tube Patterns: Inline or Staggered
  • Fin Materials: Copper, Aluminum, Stainless steel, Hot dip galvanized steel, Colmac Anti-Microbial Fin
  • Casing: Aluminum, Galvanized Steel, Stainless steel
  • Connections: IPS Pipe, Colmac Patented BiM Couplers, ANSI RF Flange Unions

Physical dimensions:

  • Finned heights up to 120 inches
  • Finned lengths up to 360 inches
  • Up to 24 rows deep in the direction of air flow


  • Horizontal or vertical air flow designs
  • Complete evaporator coil – fan tower assemblies
    • Side mounted fan towers
    • Face mounted fan towers
    • Top mounted fan towers
    • Fan diameters ranging from 20 inch up to 48 inch
  • 3-A Sanitary Design for high hygiene applications
  • 16-row deep single piece plate fin
  • Aluminum fins up to 0.032” thick for high pressure wash down applications
  • Variable fin spacing from ½ fin per inch for high frost applications and extended run time
  • Bimetallic (BiM) coupler, hygienic piping connections
  • Spiral Chillers
  • Spiral Freezers
  • IQF Tunnel Freezers
  • Carton Freezers
  • Critical Process Air Handlers
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