P-Series Air-Trap™

Positive Pressure Waterless Trap

Never Freezes – Never “Dries” Out!
The Air-Trap™ allows liquid condensate to drain from the HVAC equipment and simultaneously prevents air from entering or escaping from the equipment.

Typically, HVAC equipment is fitted with “P” traps that require water, or another liquid, within a standpipe to prevent gas from entering or leaving the unit. As a result, the “P” traps are susceptible to freezing – expansion – bursting. At other times, the traps dry out allowing gas to escape or enter the HVAC equipment. The Air-Trap™ never requires addition of water to prevent unwanted air leakage.

  • The Air-Trap™ allows water to drain from the HVAC equipment.
  • Prevents air from entering or escaping from the equipment. 
  • The trap operates dry when no water removal is required and wet when it is required.

P-Series Trap Advantages

  • When removing water, the water exits the unit but no air escapes the unit.
  • Reduces sludge buildup that normally accumulates in standard “P” traps.
  • Prevents problem with standard “P” trap never filling with water when condensate begins to form at the beginning of the cooling season.
  • Prevents freezing of trap during cold periods since there is no water in the trap.
  • P-Series Air-Trap requires no water head to cause the trap to operate. Simply come out of the plenum condensate line and go down into the P-Series Air-Trap. Come out of the trap and go horizontally with your drain line. The height requirement then becomes the height of the trap plus two elbows.

Note: The attached drawings represent traps that operate under positive pressure. Never connect condensate drain directly to a sanitary drain line.

Flammability rating is UL94 V-0


The Air-Trap™ concept has been incorporated into IAPMO IGC 196-2018 Standard for Condensate Traps and Overflow Switches for Air-Conditioning Systems.

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Scandinavian Distributor:

Air-Trap Scandinavia

C/O Energiteknik Lolland ApS  

Jesper Frederiksen

Klostervænget 1a

4900 Nakskov

+45 29440005

The FCN-Series Air-Trap™, N-Series Air-Trap™, P-Series Air-Trap™, RLC-Series Air-Trap™ and Union-Strainer™ are trademarks of Des Champs Technologies. All products are developed and manufactured by Des Champs Technologies, Virginia, USA.