1827 Pressure Relief Vent
  • Dual port valves adjust to flow conditions to work in a wide range of walk-in sizes and environments
  • High flow capacity for walk-in sizes up to 10,000 cf for coolers, and 5,000 cf for freezers
  • Heater coupled directly to louver for more frost resistance than previous models, rated down to -30°F internal temperature of freezer
  • Lower wattage consumes less energy than competitive models of same flow capacity
  • Telescopic adjustment for wall thicknesses from 31/2” to 5”, makes for easier installation
  • Compact design, fits in tighter spaces than previous vent models with same flow capacity
  • NSF Iisted and UL recognized design


  • Walk-In operation temp range: -30°F(-34.3°C) to 40°F(4.4°C)
  • Normal capacity: 1 per cf in freezer, 1 per cf in coolers. Use quantity calculator for application details.

U.S. Patents: 10,731,912 & 10,739,055



Heated Cover: Gray polycarbonate
Heated Louver: Die-cast aluminum
Heater Sleeve: Gray ABS
Louver Exterior: Gray ABS
Valve: Gray ABS
Retaining Wheel: 300 series stainless steel
Barb Lock Stud: SteeI, commercial zinc plate
Label: Mylar
Screen: Aluminum
Screws & Washers: Zinc plated steel
Heater: Wire wound siIicone rubber encased element, or etched printed element encased in polymer thick film


0.05 Amp @120 VAC, 50/60 Hz, 6 W heater
0.03 Amp @ 230 VAC, 50/60 Hz, 6 W heater


Fasten using eight #10 (5 mm) screws

Safety Standards

U.L. File No.: 57306

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