APEX Plus 4″ HVAC Plenum Access Doors

4 Inch HVAC Plenum Access Doors

The PA4 Series Door is used for medium to high performance 4″ thick non-thermal wall air handlers and is ETL tested and complies with UL 1995 safety standard for heating and cooling.

  • ETL tested‚ UL 1995
  • 6063-T5 extruded aluminum frames
  • Stainless steel piano hinge
  • 20 gauge galvanized steel panels standard
  • Polyurethane foam insulation
  • One piece Santoprene gasket, a UL recognized component


Certifications & Compliance




Polyurethane Foam

The APEX Plus Access Doors include industry approved polyurethane foam insulation for a superior seal, thermal characteristics and door rigidity to meet stringent Indoor Air Quality applications for today and into the future. Learn more about our Polyurethane Foam.

Latch TechnologyVentlok and Allegis Latches

At ITM4 we use Ventlok and Allegis Latches to give you the custom fit you need while maintaining the tightest seal in the industry. Our engineering team will help you select the most appropriate latch for your project. Learn more about our Latch Solutions.

Viewport Apex TechnologyViewport Ready

Our Viewports offer increased visibility and accessibility to any Apex door. Designed to fit existing Apex products or custom products our thermal break and non thermal break viewports are easy to install or replace in the field. Learn more about Viewports.

Custom Sizing

Our APEX doors, viewports, and plenum walls can be custom built to meet your specifications. We can create a custom sizing solution for any project. Contact us directly or become a Member to learn more about our custom options.

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Recommended Upgrade

ITM4 HVAC Viewport

Increase safety and accessibility with an ITM4 HVAC Viewport.

  • Standard and Custom sizing available
  • A variety of UV rated glass to choose from.
  • Quick & easy replacement of broken glass.

Learn More About ITM4 HVAC Viewports

Learn more about ITM4

If you want to learn more about our products and solutions, or how we can assist you please call our Customer Service Department at 763-497-0842 or visit our contact us page.


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