The Pemko 253 x 3_FG Thermal Barrier Threshold is a 6-1/8″ x 1/2″ saddle threshold designed to enhance thermal performance for doors. Specifically, a black rigid polypropylene key, called the Frost Guard (FG), acts as a thermal break between the extrusions. As a result, it reduces the transfer of hot and cold temperatures, keeping interiors more comfortable. Additionally, this threshold is available in aluminum, brass, and stainless steel, ensuring durability and long-lasting use.

Moreover, it can be installed with surface-applied vertical rod exit devices or used as a bottom door stop and seal. Because it provides 3/8″ door clearance, doors operate smoothly without obstruction. Furthermore, the non-welded design and integrated channel for the thermal key make installation simple and flexible. Overall, this threshold supports ADA accessibility when butted to a 1/2″ offset and allows versatile configurations for any door setup.

Key Features

• Frost Guard thermal break reduces heat and cold transfer
• 6-1/8″ wide saddle threshold with 1/2″ height
• Integrated channel for thermal keys
• Compatible with vertical rod exit devices or as a bottom seal
• Non-welded construction for flexibility
• 3/8″ door clearance
• ADA accessible if butted to a 1/2″ offset
• Can be paired with other half-saddles for custom configurations
• Available in aluminum, brass, and stainless steel

Benefits

• Improves thermal performance to reduce energy loss
• Limits heat and cold transfer for better interior comfort
• Durable and long-lasting construction
• Easy to install and adaptable to various door setups
• Supports ADA accessibility

Specifications

• Base Material: Aluminum, Brass, Stainless Steel
• Fasteners: WS #10 x 1.5″
• Minimum Length: 24″
• Maximum Length: 185″
• Width: 6-1/8″
• Overall Height: 1/2″

Certifications & Compliance

• UL 10C Positive Pressure
• UL 4L10 Listed
• Americans with Disabilities Act (ADA) Compliant
• ANSI/BHMA A117.1
• ANSI/BHMA A156.21 Thresholds

Finish Available