The lower the u factor the better the door keeps in heat.
Exterior hollow metal door u factor.
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.
Interpolation and moderate extrapolation are f astm c236.
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.
Any glazing area in exterior doors should be included with the appropriate glass type and analyzed as a window.
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.
B18 series steel stiffeners u factor 0 50 r value 2 01.
Hurricane rated up to 100 psf 3 0 x 7 0 single and up to 70 psf 8 0 x 8 0 pairs.
Look for a low u factor.
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.
Flush design doors available in 20 18 or 16 gage steel.
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.
Standard metal doors are 1 3 4 thick and are prime coat painted.
Hollow metal doors are shown to have superior performance for strength and durability compared to the alternate materials.
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.
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.
U value has an inverse relationship to r value.
Metal doors are more sanitary much easier to maintain and can withstand more abuse than wood or aluminum.
The gray primer finish is suitable for painting.
Steel stiffened core for added strength and durability.
Hollow metal doors with this core type are most often used at exterior openings and can be fire rated up to 3 hours.
Factor the more effective the insulation of the material.
National fenestration rating council types of doors.
The lower the u value.
All doors are tested in accordance with astm c1363 and sdi 113.
One common type of exterior door has a steel skin with a polyurethane foam.
The range is from 0 00 2 00.
