PARENT DOOR SYSTEMS LTD.:

Magnetic Weather Stripping - A positive seal against head and cold, much like the seal on a refrigerator door
Polyurethane Insulation - Each door has a "foamed-in-place" polyurethane insulating core. Polyurethane is the best of all the commonly used insulating materials for entrance ways. Compared with a wood door, the Entrance System greatly reduces heat loss through and around the door, and the combination of weatherstripping and corner seals prevent infiltration of wind, dust, water and frost. The door provides an insulation value of R15. That has a positive effect on your energy costs!
Triple Seales Bottom - A flexible triple seal bottom weatherstrip or sweep is combined with an aluminum threshold. And this unique threshold has a built-in thermal break. This special system actually compensates for building settling and maintains an efficient seal
Quiet Closing - Always closes smoothly and very quietly. You never have to slam

parent door cross section
hinge jamb corner
parent statistics - Thermal Break Sill