Online Certifications Directory
Ventilation Duct Assemblies
This category covers the fire-resistive performance of ventilation duct assemblies. These assemblies are investigated with respect to their ability to resist the spread of fire from one compartment to another without the aid of fire dampers.
Ventilation duct assemblies are investigated in accordance with ISO 6944-1985, "Fire Resistance Tests - Ventilation Ducts."
| SEARCH FOR DESIGNS | RELATED INFORMATION |
Guide Information - For general information on Ventilation Duct Assemblies (HNLJ) Guide Information - For general information on Ventilation Duct Assemblies Certified for Canada (HNLJ7) Guide Information - For general information on Fire Resistive Duct Assemblies (HNKN)
FOR FURTHER ASSISTANCE
Correlate International Building Code requirements with UL certifications Architectural Services Customer Services Regulatory Services Obtain UL Standards Training course on fire resistance General information on fire resistance ratings (BXRH) Recent additions or changes
Numbering System for Ventilation Duct Assemblies:
These assemblies are identified by an alpha-numeric system that begins with the prefix V followed by a hyphen and a one- or two-digit number.
SEARCH HINTS: To search for a particular assembly, enter the assembly number above. To search for all assemblies in this category, enter a V followed by an * in the search field. If your initial search yields an excessive number of matches, select "Refine Your Search" and tighten the search parameters using the desired hourly rating, company name of components used in the assembly, and other key words.