Leakage Ratings Through Walls, Dampers, Doors, Firestops and Joints Richard N. Walke Underwriters Laboratories Inc.

Topics for Discussion Leakage Ratings for Walls, Dampers, Doors, Firestops and Joint Systems Recent NFPA Code Proposals Relating to Smoke Leakage

Leakage Ratings

HVAC Smoke Control Methods Engineered Systems Static or Passive Systems

Walls – UL 263 Air Leakage Assumed to be Smoke Tight Standard does not Include Leakage Ratings

Dampers – UL 555S Air Leakage Through Interior of Damper Class I, II and III Performance Levels at Elevated Temperatures Codes focus on Class II Performance at 250 F

Doors – UL 1784 Leakage Determined at 0.1, 0.2 and 0.3 in. WC (25, 50 and 75 Pa) Tested at Ambient and 400 F Results Published in cfm per sq ft of Door Opening

Firestops – UL 1479 Leakage Determined at 0.3 in. WC (75 Pa) Tested at Ambient and 400 F Results Published in cfm per sq ft of Opening

Joints – UL 2079 Leakage Determined at 0.3 in. WC (75 Pa) Tested at Ambient and 400 F Results Published in cfm per lin ft of Opening

NFPA Code Changes

Proposed Leakage Ratings Requirements Covers Smoke Barriers Only Cumulative Leakage Limited to 0.75 cfm per sq ft of Wall for all Dampers, Doors, Through-Penetration Firestops and Joints

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