One of our most rugged and reliable commercial garage doors is the Stormtite Model 627 from Overhead Doors Inc. It is designed for industrial and mainstream commercial applications where climatic conditions require good thermal insulating properties. This model of rolling overhead door provides the best ranked thermal performance of any major US commercial garage door manufacturer. The Model 627 has an R value of 10.9 and a U value of 0.09 with a tested U factor of 0.84 with the door installed.
R value is a measure of thermal resistance. The higher the R value of any element, the better its ability to resist the transmission of heat. Other factors in determining thermal resistance are surface air films, reflectivity of aluminum foil surfaces and cavity air spaces.
U value is the coefficient of heat transmission or thermal transmittance, a U-Value is basically a measure of heat loss through a structural element. It is calculated on the rate at which heat transfers through 1 square meter of a structure, where the temperature difference between the inner and outer face is 1 degree Celsius.
U value is the measure of structural heat loss per unit of surface area. U-Values are calculated as the reciprocal of the sum of R values, i.e. (1 / total sum of R values). The lower figure reached in calculation, the better the insulation value of the structure.
Without the proper seals on an overhead door, air leakage will drastically reduce the insulating efficiency of the door. This model door offers advanced design of the perimeter seals which provide superior protection against air leakage. Premium insulation will also generate greatly reduced sound transmission as well. The sound performance of the Stormtite™ AP Model 627 furnishes a through curtain Sound Transmission Class (STC) rating of 28 and installed system rating of 21.
Material - 24 ga. galvanized steel front and back, Max. standard width: 30' (9144 mm), Max. standard height: 19' (8534 mm)
Slat profile - Flat, insulated, type FIT-265
Insulation - Foamed-in-place, CFC and HCFC-free polyurethane, R-value 10.9 (1.91 W/Msq); U-factor 0.84
Finish - Gray, tan, white or brown
Hood - 24 ga. galvanized steel
Sound Transmission Class rating - Through curtain 28; Installed system 21
Flame Spread & Smoke Index - Class A or 1
Wind load - 20 psf
Standard mounting - Face of wall
Operation - Chain hoist
Standard springs - 20,000 cycles
Advanced Perimeter Protection - Bottom weatherseal, interior and exterior EPDM triple-finned guide brush weatherseals, interior hood baffle, and lintel seal
Guides - Three structural steel angles
PowderGuard™ Weathered finish with black powder coat
Bottom bar - Black powder coated steel with vinyl weatherseal
Lock - Chain keeper
Warranty -24-month limited on door, 3 year limited on door and operator system (when purchased together)