The Pemko 253 x 4_FG Thermal Barrier Threshold 7-1/8″ x 1/2″ is engineered to reduce heat and cold transfer at door openings. With its Frost Guard thermal barrier, the Pemko 253 x 4_FG improves energy efficiency while protecting interiors from outdoor temperature changes and weather exposure.

Key Features

• Frost Guard (FG) thermal barrier for improved weather protection
• Rigid polypropylene thermal key between extrusions minimizes heat and cold transfer
• 7-1/8″ width with 1/2″ height
• Allows 3/8″ door clearance
• Integrated channel for connecting thermal keys
• Wood screw standard installation
• Not welded construction
• Compatible with surface-applied vertical rod exit devices
• Can function as a door stop and bottom seal

Benefits

• Improves thermal performance by reducing temperature conductivity
• Lowers energy usage by limiting heat and cold transfer
• Allows custom saddle configurations with additional half saddles
• Helps maintain indoor comfort and energy efficiency
• Supports ADA accessibility when properly installed with a 1/2″ offset

Certifications & Compliance

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

Finish Available