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VPFR 100


Industrial-Grade, Reinforced Grill

Industrial-grade, VPFR Series (Viewing Pane Fixed Reinforced) infrared (IR) windows enable thermographers to survey critical electrical applications more efficiently and safer than ever.

Closed Panel Inspections

Use of the VPFR Series IR windows nearly eliminates the risks associated with IR electrical inspection by providing companies with a non-invasive, closed-panel inspection methodology.

Durable, Fully Impact-Resistant

The VPFR Series of IR windows are durable and fully impact-resistant per UL and IEEE standards. The patented, reinforced grill exceeds high voltage switchgear viewing pane standards.

Easy-Grip™ Stainless Steel Cover

The VPFR Series is available with an Easy-Grip™ stainless steel cover. This lockable cover maintains IP65/NEMA 4 seal when closed.





Window Housing and Cover UUL 94 5VA Nylon (switchgear-grade plastic); -40°C (-40°F)to 273°C (523°F), Easy-GripTM stainless steel cover
Optic UL 746 compliant, IR transmissive polymer; -40°C (-40°F) to 325°C (617°F)
Reinforcing Grill Aluminum coated with UL 94 5VA Nylon; -40°C (-40°F) to 273°C (523°F)
Gaskets UL 94 5VA TPE; -40°C (-40°F) to 273°C (523°F)
Hardware 316 stainless steel


Useful Temperature Rating -40°C (-40°F) to 200°C (392°F)
Water and Dust Ingress IP65 / NEMA 4: closed and when in use


Model Body Diameter Window Diameter Assembly Thickness
VPFR-50 9.1 cm (3.6 in) 5.1 cm (2.0 in) 2.6 cm (1.0 in)
VPFR-75 12.1 cm (4.8 in) 7.6 cm (3.0 in) 2.6 cm (1.0 in)
VPFR-100 15.1 cm (5.95 in) 10.2 cm (4.0 in) 2.6 cm (1.0 in)



IRISS IR windows are the most certified windows in the industry with IEEE (impact & load), UL, cUL, Lloyds, CSA 22.2 14-13 for industrial control equipment, DNV and ABS (American Bureau of Shipping) credentials.

Protected by our Unconditional Lifetime Warranty

Unconditional lifetime warranty applies not only to the workmanship of the window housing but also applies to the durability and stability of the optic in the proposed environment.


ul certification

UL 508 & 508A

UL 508 and UL 508A are classification for the components used on electrical panels. UL 746C is a standard requiring flammability and impact tests for polymeric materials used on electrical equipment.

csa certification

CSA C22.2 No. 14-10

Canadian Standards Association shows that a product has been independently tested and certified to meet recognizable standards for safety and performance.

ul certification

UL 50V

UL 50V applies to infrared windows and is more of a classification than a standard that applies for performance-of-build characteristics.

lloyds of london certification

Lloyd’s of London

Lloyd’s provides independent, third-party approval certificates attesting to a product’s conformity with specific standards or specifications. It verifies the manufacturer’s production quality systems through a combination of design reviews and type testing.

ul certification

UL 50E

UL 50E standard applies to enclosures for electrical equipment intended to be installed and used in non-hazardous locations.

nema certification


These equivalent ratings certify enclosures for indoor or outdoor use. They protect against access to hazardous parts, ingress of foreign objects and water from rain, sleet, snow, splashing or hose directed water & ice formation damage.

ul certification

UL 746C

Sets the impact & flammability standards for polymer materials used in electrical equipment to 1500 volts. Plastic/polymer parts of an IR window must pass flammability tests at room temperature & remain intact during an impact test performed at 0°C (32°F).

abs certification

American Burea of Shipping

An ABS assessment is the pre-approval of a product for use on a variety of ABS- classed ships following a technical evaluation. Ship designers, builders and owners can select the product to be placed aboard and ABS-classed vessel.

ul certification

UL 1558

Requirement covers metal-enclosed, low-voltage power circuit breaker switchgear assemblies containing but not limited to low-voltage power circuit breakers, switches, control, instrumentation and metering, protective and regulating equipment.

arc certification

Arc Rating / Arc Testing

IEE C37.20.7 Type 2B: 63kA, 15kV for 30 cycles at 60Hz
IEC 60298 Appendix A: 63kA, 15kV for 30 cycles at 60Hz
IEE C37.20.7 Type 2B: 50kA, 15kV for 30 cycler at 60Hz
IEE C37.20.7 Type 2B: 63kA, 15kV for 30 cycler at 60Hz
IEC 60262271-200: 63kA, 15kV for 30 cycles at 60Hz
IRISS has the highest rating of any window that has been tested

dnv certification


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