Description

This standard is fire tests of window assemblies and other light-transmitting products (e.g., glass blocks) used in vertical fire-resistive assemblies. It evaluates a product's ability to remain in place during a fire, followed by a hose stream test.

These products provide fire protection (preventing passage of flames/smoke) but limited protection against heat transmission.

Scope

Application: Covers fire-rated glazing, frames, and windows in fire-rated wall assemblies, often required by the International Building Code.

Test Procedure: Specimens undergo a standard fire exposure test, ensuring they withstand high temperatures for a specific time, followed by a hose stream test to test structural integrity.

Pressure Type: Tests can be conducted under neutral pressure or positive pressure to match real-world fire scenarios.

Ratings: The standard applies to fire-protection-rated glazing typically used in 20-minute up to 3-hour fire windows, generally marked with an "OH" (Opening/Hose stream) designation.

Limitations: UL 9 tests do not determine if the window can be used again after fire exposure, and they generally offer low protection against radiant heat transfer (fire-protective rather than fire-resistive).