Category A And B Doors

Woodharbor 20 minute fire rated doors fall into category b classification as shown above.

Category a and b doors.

To achieve the supplemental s label a door must also pass for smoke and air infiltration. Rating of the fire door assembly is usually required to be 90 minutes aka b label. For example for most applications the 2015 edition of the international building code ibc requires a two. 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.

If you prefer an open look and feel entry doors. Doors with a 60 minute rating are also classified as b label doors and are used in some interior exit stairway and ramp enclosures. 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. In some cases category g sealing systems might be required on the meeting stiles of pairs of category a doors.

Doors are tested following standards including ul10b ul10c astm e2074 and nfpa 252. All intumescence and or gasketing is furnished by others. Class b 1 5 hour approved for doors in vertical shall openings not exceeding 1 200 sq. The edge seals are typically added to the frame or field applied to the door i e.

Fiberglass options combine the versatile designs of wooden doors with the strength of steel. 100 square inches of exposed glass is allowed. 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. These doors are usually used for stairwell doors but are sometimes used at all the rated walls in a building.

No glass is allowed in these doors. A fire door that requires the addition of and edge seal to comply with positive pressure requirements. Front door styles wooden doors have a classic look but require regular maintenance to keep them looking fresh. Class a 3 hour approved for doors in dividing fire walls with openings not exceeding 1 200 sq.

These doors are used for openings in walls separating buildings that are joined together. 1 1 2 hour rating for a 2 hour wall. 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. Steel front doors are stronger and more energy efficient but are limited on design styles.

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.