Category A And B Doors

Fiberglass options combine the versatile designs of wooden doors with the strength of steel. Smoke seal labels in addition to standard fire ratings a 3 hour b 90 or 60 minute c 45 minute and 20 minute some positive pressure doors may also be required to carry a smoke seal s label. When combined all of the components of the door form an assembly that protects the opening.

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Doors with a 60 minute rating are also classified as b label doors and are used in some interior exit stairway and ramp enclosures.

Category a and b doors.

Class a 3 hour approved for doors in dividing fire walls with openings not exceeding 1 200 sq. In some cases category g sealing systems might be required on the meeting stiles of pairs of category a doors. 100 square inches of exposed glass is allowed. Class b 1 5 hour approved for doors in vertical shall openings not exceeding 1 200 sq.

For example for most applications the 2015 edition of the international building code ibc requires a two. 1 1 2 hour rating for a 2 hour wall. All intumescence and or gasketing is furnished by others. Boasting glass from top to bottom to maximize your views this full light style storm door is low maintenance and durable for a long lasting use in your home.

Class c 0 75 hour approved for doors in corridor or room partition opening not exceeding 1 200 sq. The andersen 2500 series self storing storm door is the andersen 2500 series self storing storm door is a heavy duty and seasonal ventilation storm door that offers a wide variety of features and options. The edge seals are typically added to the frame or field applied to the door i e. Category b doors a fire door that requires the use of an edge seal to comply with positive pressure requirements.

Steel front doors are stronger and more energy efficient but are limited on design styles. Front door styles wooden doors have a classic look but require regular maintenance to keep them looking fresh. Doors are tested following standards including ul10b ul10c astm e2074 and nfpa 252. Once tested the door and frame receive a label that describes the amount of time the component is expected to provide protection when exposed to fire.

To achieve the supplemental s label a door must also pass for smoke and air infiltration. These doors are usually used for stairwell doors but are sometimes used at all the rated walls in a building. These door slabs systems may have been evaluated with an edge sealing system category g field applied to the labeled frame or door. Rating of the fire door assembly is usually required to be 90 minutes aka b label.

No glass is allowed in these doors. If you prefer an open look and feel entry doors. These doors are used for openings in walls separating buildings that are joined together. A fire door that requires the addition of and edge seal to comply with positive pressure requirements.

Woodharbor 20 minute fire rated doors fall into category b classification as shown above. Category b doors a fire door slab that may have been evaluated with the addition of a category g edge sealing system between the door and frame.

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