Leakage Ratings Through Walls, Dampers, Doors, Firestops and Joints Richard N. Walke Underwriters...
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Transcript of Leakage Ratings Through Walls, Dampers, Doors, Firestops and Joints Richard N. Walke Underwriters...
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 SmokeControl 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
Contact Information
NBK Architectural ServicesPhone: (847) 272 – 8800, Ext. 40057
Fax: (847) 574 – 4017Email:
