Exterior Hollow Metal Door U Factor

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.

Exterior hollow metal door u factor.

Standard metal doors are 1 3 4 thick and are prime coat painted. B18 series steel stiffeners u factor 0 50 r value 2 01. Hollow metal doors with this core type are most often used at exterior openings and can be fire rated up to 3 hours. The gray primer finish is suitable for painting.

U value has an inverse relationship to r value. 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. Hurricane rated up to 100 psf 3 0 x 7 0 single and up to 70 psf 8 0 x 8 0 pairs. One common type of exterior door has a steel skin with a polyurethane foam.

Factor the more effective the insulation of the material. 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. The insulation value is much higher than the honeycomb but lower than the polyurethane. 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.

L18 series per astm c1363 r factor 2 64 u factor 38. Stc 26 sound transmission fire label rated for use in 20 minute through 3 hour fire ratings. 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. The range is from 0 00 2 00.

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. Hollow metal doors are shown to have superior performance for strength and durability compared to the alternate materials. Flush design doors available in 20 18 or 16 gage steel. Interpolation and moderate extrapolation are f astm c236.

The lower the u value. Any glazing area in exterior doors should be included with the appropriate glass type and analyzed as a window. The lower the u factor the better the door keeps in heat. 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.

Look for a low u factor. National fenestration rating council types of doors.