850 Series


The Thermacore® AP Model 850 is engineered to deliver advanced performance in commercial and industrial applications where climate control, durability and ease of maintenance are primary concerns.

The Thermacore® AP door system’s advanced performance answers the demand for more reliability, durability, design flexibility and thermal efficiency.

This door system presents the most advanced thermal performance values published by any major US manufacturer of 3″ commercial insulated sectional doors with an R-value* of 26, U-value** of .038 and a tested installed U-factor of .14.

Standard Max Width

40’2″ (12,243 mm)

Standard Max Height

24’1″ (7317 mm)


10 year limited delamination
1 year material and workmanship
3 year/20,000 cycle door and operator system
(material and workmanship)

Panel thickness

3″ (76.2 mm)


26 (4.58 Msq/W)


0.038 (.22 W/Msq)

Installed U-Factor

.14 Btu/hr x ft² x Fº (.80 W/m²)

Air infiltration

At 15 mph (24 kmph) .09 cfm/ft² (1.65 m³/hr/m²)

Thermal Break

1-3/4″ wide PVC thermal break; PVC thermal break on end stiles

Exterior steel

.015″ (.38 mm)

Exterior surface

Microgroove, textured

Standard springs

10,000 cycles

Exterior Color

White, brown, almond or taupe

Interior Color


For applications with advanced security and safety needs consider extra locks, a sensing edge, photo-eyes, and a cable failure device. For high usage projects consider the high cycle springs and high cycle components package. Ask your Overhead Door Distributor for more information about the special applications options.

  • Large thermal lites (25″ w x 13″ h); black frame standard
  • Optional color matched frame available
  • Glass: insulated, insulated tempered, multi-wall polycarbonate in clear, bronze, or white
  • High-cycle springs
  • High-usage components
  • Electric operator
  • Chain hoist
  • Cable failure device
  • Bottom sensing edge
  • Exhaust Ports (available in 3″ and 4″)