Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell.
Exterior hollow metal door u factor.
Factor the more effective the insulation of the material.
Metal doors are more sanitary much easier to maintain and can withstand more abuse than wood or aluminum.
Flush design doors available in 20 18 or 16 gage steel.
The insulation value is much higher than the honeycomb but lower than the polyurethane.
Standard metal doors are 1 3 4 thick and are prime coat painted.
L18 series per astm c1363 r factor 2 64 u factor 38.
Hollow metal door series core frame test methodology astm c1363 operable astm c518 calculated astm c1363 sealed in place u factor r value u factor r value u factor r value trio e polyurethane steel stiffened tb 0 29 3 4 0 09 11 0 n a n a trio e polyurethane steel stiffened kerf 0 36 2 7 0 09 11 0 n a n a.
Interpolation and moderate extrapolation are f astm c236.
U value has an inverse relationship to r value.
U factor the total or overall transmission of heat through a combination of materials assembly measured in btu s per hour per square foot of area for a difference in temperature of 1 f between the air on one side to the air on the other side.
Hollow metal doors with this core type are most often used at exterior openings and can be fire rated up to 3 hours.
The range is from 0 00 2 00.
One of the lowest operable u factor in the industry for a steel stiffened door u factor 36 first steel stiffened hollow metal swinging door to qualify for greenguard gold.
For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09.
All u factors for exterior doors in the table are for doors with no glazing except for the storm doors which are in addition to the main exterior door.
National fenestration rating council types of doors.
The lower the u value.
Look for a low u factor.
One common type of exterior door has a steel skin with a polyurethane foam.
Hurricane rated up to 100 psf 3 0 x 7 0 single and up to 70 psf 8 0 x 8 0 pairs.
Any glazing area in exterior doors should be included with the appropriate glass type and analyzed as a window.
Steel stiffened core for added strength and durability.
The lower the u factor the better the door keeps in heat.
Hollow metal doors are shown to have superior performance for strength and durability compared to the alternate materials.
Non handed and fully reversible on the job site versadoor can be used for right or left hand opening swing in or out single or in pairs.
All doors are tested in accordance with astm c1363 and sdi 113.
