Skip Navigation
Search Our Products

Type of Product

Product Family





The basic NPAC model is made to counteract the one-way flow-through forces caused by negative building pressure or by wind effects.

Model NPAC Negative Pressure Air Curtain


  • Single Nozzle and Intake
  • Proprietary Nozzle Design
  • Greatly Diminishes One-Way Air Flow Caused By Building Air Imbalances
  • Horizontal, Curvilinear, Recirculatory Air Flow
  • Powder Coated Steel
  • Metal Clad Insulation When Required
  • Specifications
    Supply where indicated on plans HCR Model NPAC Air Door for doorways with low temperature differentials and or for temperatures above freezing.
    Air Door to be powder coated cold-rolled steel. Powder coating meets 500 hour salt spray test.
    NEMA 1 Power/control panel complete. Model NPAC equipment cabinet houses the centrifugal fan, fan motor, fan drive components, and prewired electrical components. Service door(s) are provide, if required, to allow access to all internal components. Motor is controlled by VFD (Variable Frequency Drive). Single point electrical connection.
    Air Door to have two side plenums: one with discharge nozzle, the other with an intake.
    Discharge nozzle is easily adjustable to maximize air block. Air volume adjustment mechanisms are easily accessible without removing any covers or secondary openings.
    Unit can be mounted on either side of wall. Depending on temperature differential insulation cladding may be required.
    Air Door assembly is structurally self supporting. All hardware has protective coating against corrosion.
    Air Door power to be 208, 240, or 480 volt AC, 60 Hertz, 3 phase. Visible signal light to show when motor is not running. Complete door assembly to be ready for connection to power. (Architect to designate responsibility for field wiring.)
    Architectural Data Sheets
  • Options & Accessories
    1. Metal cladding can be stainless steel or cold-rolled steel powder coated to custom color.
    2. Clean outs’ can be added where needed.
    3. Complete NEMA 3, 4, 4x, 4x stainless, or 12 requirements.
    4. Custom standoff panels with trim to interconnect to night doors or existing doors.
    5. HCR Air Door to be used in conjunction with existing or new door to form a Hybrid solution.

    These doors can include all types of roll up doors, hard insulated automatic doors that slide either horizontally or vertically, or insulated sliding mattress doors. When the temperature differential is large and spans freezing an insulated door, or double panel heated roll up door is required.

Back to Top