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Advertising supplement provided The Window & Door Manufacturers Association

Positive Pressure Fire Doors — Positive Pressure fire door test criteria continue to be adopted by states and municipalities across the U.S. To meet requirements, openings typically require an intumescent seal or gasket applied either to the frame or concealed within the door itself. Understanding positive pressure requirements and communicating them to the door manufacturer is crucial in meeting code requirements. I.S.1A explains the mechanics of positive pressure and uses a new door construction identifier (PP) to help clarify specification.

 

Left: Architectural wood flush doors are appropriately characterized in the standard according to use. Source: Eggers Industries, Neenah, Wis. Right: Architectural wood flush doors are covered under a newly revised performance standard. Source: Algoma Hardwoods, Algoma, Wis.

One of the most recent developments with regards to fire doors has been the changeover to positive pressure testing versus neutral testing methods. An issue literally years in discussion, this technical and scientific debate has subsided, and positive pressure is quickly becoming the standard method of testing required by major building code bodies coast to coast. Some 40 or so states (or major cities within those states) have adopted or soon will either adopt the Uniform Building Codes 7-2 1977 or the International Building Code 2000 or 2003. (See related story on these pages for key phrases used in determining the exact nature [positive or neutral pressure] of fire doors.)

Specification Checklist — Wood flush door guide specifications vary, but there are certain aspects that must be addressed to ensure that the doors meet the requirements of the specifier and building owner. I.S.1A includes a specification checklist, providing a reference to make sure all key points are addressed. (See the Guide Specifications Checklist included on these pages.)

The new WDMA I.S. 1A door standard also contains a totally updated pre-finishing section that helps clarify the different types of finishing systems that are available and their performance characteristics. In the past, standards detailed 16 different systems most of which are not typically utilized in the finishing of architectural and commercial wood doors. While identifying all 16 systems, the new standard focuses on the three systems that are typically used in the industry. Those highlights include:

Factory Finishing — Most architectural and commercial wood doors are now specified to be pre-finished at the factory, prior to delivery at a jobsite. State- of-the-art equipment operated in controlled conditions result in the best possible appearance. The raw wood doors are prepared in automated sanding equipment, removing scuffs, scratches, and handling marks before the application of stain and clear top coats. Field finishing cannot duplicate the conditions and results.

Samples that represent the color, build, and sheen are supplied to a door manufacturer who matches the sample and submits it for approval to the specifier. Upon approval, the door manufacturer then applies the stains and finishes that duplicate the appearance of the sample submitted. The process of sample generation and approval typically takes five to 10 days.