IRISS VPT 2-4″ Visible, Round Infrared Windows

Demonstrations available!

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Reduce the risk of arc-flash by performing thermal inspections without opening switchgear doors.

The IRISS VPT is a series of round infrared windows with visually clear, reinforced polymer.  These windows meet every UL and IEEE standard and are guaranteed for life.


The IRISS VPT round infrared windows features a reinforced, visually clear polymer window that is fully infrared transmissible.  Unlike other windows, the IR transmissivity will not degrade over time.  These windows also feature a hinged, metal cover and come in three sizes:

  • VPT-50 – 2″ diameter viewing window
  • VPT-75 – 3″ diameter viewing window
  • VPT-100 – 4″ diameter viewing window

IRISS VPT Window Product Highlights:

  • Safe:  Conduct IR inspections without opening enclosures
  • Certified: IRISS windows have been independently tested and certified to every applicable standard proscribed by UL and IEEE
  • Durable: VPFR windows have been successfully tested as an installed component in arc-resistant enclosures at up to 63kA, 15kV for 30 cycles at 60Hz per IEEE C37.20.7 Type 2B.  There is no safer or more durable window.
  • Affordable:  Our reinforced polymer windows are less expensive than crystal windows.  Call for a quote.
  • Readily available:  Windows are in stock for delivery when you need them, even overnight.
  • Versatile:  We offer not only conventional round windows, but also rectangular panes to 24″ wide and custom designs
  • Guaranteed:  Unconditional lifetime warranty.  We will replace any window that fails for any reason for life.

round infrared windows, with viewing areas of 2″, 3″, and 4″ diameter