HVAC Air Duct Leakage. Eli P. Howard, III Group Director Technical Resources SMACNA
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1 HVAC Air Duct Leakage Eli P. Howard, III Group Director Technical Resources SMACNA
2 Key Variables that Affect the Amount of Leakage Static Pressure Amount of Duct Openings in the Duct Surface Seams, Joints, Access Doors, Rod and Fastener Penetrations Workmanship
3 Duct Leakage is Related to Duct Surface Area Research in Europe and in the U.S. has led to the Conclusion that a Duct Surface Leakage Factor can be Identified by the Following Relationship: F = C L P N
4 Duct Leakage is Related to Duct Surface Area F = C L P N Where: F is a leak rate per unit of duct surface area (typically CFM/100SF) C L is a constant P is static pressure (typically in in. W.G. ) N is an exponent (most typically 0.65)
5 Duct Construction Standards Ductwork be Constructed for the Specific Pressure Classifications shown on the contract Drawings (1/2", 1", 2", 3", 4", 6", 10") Duct Construction per SMACNA HVAC Duct Construction Standards Ducts Sealed in accordance with Table 1-2 SMACNA HVAC Air Duct Leakage Test Manual 1985, HVAC-DCS 1995
6 Table 1-2 Standard Duct Sealing Requirements SEAL CLASS Sealing Requirements Applicable Static Pressure A B C Class A: All Transverse joints, longitudinal seams, and duct wall penetrations Class B: All Transverse joints and longitudinal seams only Class C: Transverse joints Construction Class 4 w.g. and up (1000 Pa) 3 w.g. (75-0 Pa) 2 w.g. (500 Pa) only In addition to the above, any variable air volume system duct of 1 (250 Pa) and 1/2 w.g. (125 Pa) construction class that is upstream of the VAV boxes shall meet Seal Class C.
7 Definitions Seam: Joining two longitudinally (in the direction of airflow) oriented edges of duct surface between two joints. Helical (spiral) lock seams are exempt from sealing requirements.
8 Definitions Joints: All other duct surface connections made on the perimeter are deemed to be joints including: Girth Joints Branch & Sub-Branch Intersections Duct Collar Tap-ins Fitting Subsections
9 Definitions Joints: (Continued) Louver and Air Terminal Connections to Ducts Access Door and Access Panel Frames and Jambs Duct, Plenum and Casing Abutments to Building Structures
10 Definitions Duct Wall Penetrations Control Rods/Levers Pressure Taps Fastener Penetrations
11 Duct System Designer Match Fan to System Pressure Losses Account for Equipment Leakage (Fans, Coils, VAV, etc.) Specify Duct Pressure Class Specify Amount & Manner of Leakage Testing
12 Duct Sealing Leakage is a Function of Static Pressure and System Size Designer Must Specify the Duct Pressure Class or Classes Required for Duct Construction Duct Construction at 1" & ½" Pressure Class Meet Seal Class C Recommended
13 Duct Sealing Unsealed Ducts may leak at the following Rates: Duct Pressure in Inches w.g. CFM/100 S.F
14 Sealants Liquids Consistency of Heavy syrup Can be Applied by Brush, Cartridge Gun or Powered Pump Contain percent Volatile Solvents Shrinkage when Drying
15 Sealants Liquids Recommended for Slip Type Joints where the Sealant Fills a Small Space Between Overlapping Pieces of Metal Where Clearances Exceed 1/16" Several Applications may be Necessary
16 Sealants Mastics More Suitable for Application as Fillet, in Groves or Between Flanges Have Excellent Adhesion and Elasticity Gaskets Durable, Soft Elastomer Butyl or Extruded Forms Used in Flange Joints Should Have Adhesive Backing for Ease of Application
17 Sealants Tapes Such Closures are Listed as Components of Systems Complying with UL 181 No Recognized Industry Performance Standards that set forth:» Peel Adhesion, Shear Adhesion» Tensile Strength» Temperature Limits» Accelerated Aging
18 Sealants Tapes Some test results are published in the product directories of the Pressure Sensitive Tape Council located in Glenview, Illinois. Shelf Life Difficult to Identify (6 mos.-1 yr.) Aging Characteristics Questionable Compatibility of the Adhesive with the Duct Material (Flexible, Non-metallic Ducts)
19 Sealants Heat-Applied Materials Hot Melts normally Shop Applied Thermally Activated Uses Heat to either Shrink Fit Closures or to Expand Compounds within Joint Systems Mastic and Embedded Fabric Woven Fabrics (Fibrous Glass Mesh, Gauze, Canvas, etc.) Sealing Compounds including Lagging Adhesive
20 Sealants Shelf Life may be one year or less often only 6 months. Installer should verify that shelf life has not been exceeded. Safety Considerations Sealants may be flammable in wet or partially cured state Use liquids & mastics in well-ventilated areas Observe printed precautions of manufacturers
21 Leakage Tests Need to verify leakage control by field testing is not present when adequate methods of assembly and sealing are used. Leakage tests for duct systems constructed to 3" w.g. or lower not recommended not cost effective.
22 Leakage Tests For Systems of 4" w.g. Class and higher: The designer must determine if any justification for testing exists. If so, he must clearly designate in the contract documents the portions of the system(s) to be tested and must specify the appropriate test methods.
23 Leakage Tests ASHRAE Energy Conservation Standards Series 90 text on Leakage Control generally requires tests only for pressures in excess of 3" w.g. Adequate airtightness can normally be ensured by Selecting static pressure construction class suitable for operating condition AND Sealing ductwork properly
24 Table 4-1 Applicable Leakage Classes DUCT CLASS ½", 1", 2' W.G. 3" W.G. 4", 6", 10" W.G. SEAL CLASS C B A SEALING APPLICABLE TRANSVERSE JOINTS ONLY TRANSVERSE JOINTS & SEAMS JOINTS, SEAMS & ALL WALL PENETRATIONS LEAKAGE CLASS RECTANGULAR METAL ROUND METAL
25 DUCT LEAKAGE CLASSIFICATION FIGURE 4-1
26 DUCT LEAKAGE CLASSIFICATION FIGURE 4-1
27 Test Procedures 1. Select a section of duct to be tested. 2. Select a test pressure not in excess of the pressure class rating of the duct. (Usually the actual operating pressure.) 3. Calculate the allowable leakage using leakage factors for the duct surface area.
28 Test Procedures 4. Select the blower and orifice suitable for the test airflow requirements. 5. Connect the blower and flowmeter to the duct section. 6. Provide temporary seals at all ends of the ductwork.
29 Test Procedures 7. Start the blower at a low airflow capacity, increasing the airflow until the test pressure is reached. 8. Adjust blower capacity until steadystate conditions at the test pressure are achieved.
30 Test Procedures 9. Record the airflow (across the orifice) at the steady state condition. 10. This airflow is the CFM leakage of the tested section of the duct.
31 ILLUSTRATION OF TESTING FIGURE 3-1
32 LEAKAGE TEST METER APPARATUS FLANGE TAPS FIG. 5-1
33 TYPICAL ORIFICE FLOW CURVES FIGURE 5-3
34 P in. w.g. 1.4" Orifice Size 2.625" 4.90" P in. w.g. 1.4" Orifice Size 2.625" 4.90" P in. w.g. 1.4" Orifice Size 2.625" 4.90" TABLE 5-2 ORIFICE FLOW RATE (SCFM) VS. PRESSURE DIFFERENTIAL (in. of Water)
35
36 13.6 4" w.g. Construction Class operating at 3.5" w.g. = Leakage Class 6 DUCT LEAKAGE CLASSIFICATION FIGURE 4-1
37 TABLE A-1 LEAKAGE AS PERCENT OF FLOW IN SYSTEM 3.4
38 NOTES TABLE A-1 LEAKAGE AS PERCENT OF FLOW IN SYSTEM GIVEN: ASSUME: From Fig. 4-1 Fan CFM = Leakage Class = C L 6 Duct Area = 4000 sf. Operating Pressure = 3.5 w.g. Fan CFM = = 4 Duct Area 4000 Leakage Factor = 13.6 CFM/100 sf. CALCULATION: % of flow = Leakage Factor = 13.6 = 3.40 Fan CFM 4 Duct Area
39 Questions & Answers
40 Through-Penetration Firestopping Eli P. Howard, III Group Director Technical Resources SMACNA
41 Today's Program Definition & Purpose Background & Terminology Codes & Regulations Specification Responsibilities Firestopping Selection Factors Typical Details/Drawings
42 Definition A through-penetration firestop system is a specific field erected construction of an assemblage of materials designed to prevent the spread of fire and its by-products for a prescribed period of time through openings which are made in floors and walls to accommodate through penetrating items such as ducts, metal and plastic pipes, electrical conduit, cables, cable trays, etc.
43 Definition A firestop system consists of three components: 1. A fire resistive assembly or fire barrier (wall, floor, etc.); 2. The penetrating items (ducts, pipes, conduits, etc.); and 3. The sealant material.
44 Purpose Outline Considerations in Specifying and Installing Through-Penetration Firestop Systems
45 Terminology Annular Space The distance from the inside edge of the opening to the outside of the penetrating item.
46 Terminology Area Separation A wall of fire-resistance-rated construction (expressed in hours), which serves to divide the floor area of a building into acceptable area limits as set forth in the code having jurisdiction.
47 Terminology Fire-Rated Partition A partition having an assembly of materials that will afford a given fireresistance rating (expressed in hours) to impede the spread of fire from one area to another.
48 Terminology Fire Wall A continuous (basement-to-roof) wall having adequate fire-resistance rating (expressed in hours) with adequate structural stability under fire conditions to completely subdivide a building or separate adjoining buildings to restrict spread of fire.
49 Terminology F Rating A rating, usually expressed in hours, indicating a specific length of time that a fire-resistive barrier can withstand fire before being consumed or permitting the passage of flame through an opening in the assembly.
50 Terminology Intumescence A characteristic of certain fire barrier products that when exposed to heat, expand, self-sealing and filling any void in the penetration. When exposed to flame, intumescent materials will form a hard char.
51 Terminology L Rating A rating, usually expressed in cubic feet per minute per square foot of opening, determined by the air leakage test. It is a measure of the ability of a fire-resistive assembly to resist air or smoke infiltration resulting from pressure differences. L ratings may be given for ambient and elevated temperatures.
52 Terminology T Rating A rating, usually expressed in hours, indicating the length of time that the temperature on the non-fire side of a fireresistance-rated assembly exceeds 325 above its ambient temperature.
53 Codes & Regulations Compliance to ASTM E119 & E814 Compliance to UL 263 & 1479 ICC Building Code NFPA5000 Building Code Local/State Code Authority
54 Specification Responsibilities
55 Architects It is Important that the Architect Clearly Identify All Fire Resistant Assemblies and their Hourly Ratings on the Drawings
56 Engineers/Systems Designers It is Important that the System Designers Clearly Identify on the Project Drawings All Penetrations of Fire Resistive Assemblies and the Details of the Required Materials and Methods to be Installed to Maintain the Fire Resistive Integrity of those Assemblies.
57 Building/Code Officials It is Mandatory that the Plans and Specifications Completely Identify All Fire Resistant Construction, Penetrations of those Designated Fire Resistant Assemblies, and the Details of How those Penetrations are to be Protected. It is the Responsibility of the Code Official to Determine that the Required Information is Contained in the Construction Documents.
58 HVAC/Electrical Contractors The HVAC and Electrical Contractors Are Not Responsible for the Quantity, Location and the Details of Producing or Maintaining the Required Fire Resistance Ratings of Assemblies which are Penetrated by the Materials and Systems Installed by their Trades Except as those Quantities and Details are Shown on the Drawings and in the Specifications.
59 Factors Determining the Selection of a Through-Penetration Firestop System
60 A. The Material and Construction Type (Wall, Floor, etc.) of the Fire Resistant Assembly being Penetrated: Concrete Brick/Block Gypsum Metal Wood
61 B. The Type of Penetrating Item: Metallic Pipes (Insulated/Uninsulated) Non-Metallic Pipes HVAC Ducts Cables Cable Trays/Busways/Conduits Combinations of the above
62 C. The Relative Geometry of the Opening and the Penetrating Item: Round Opening/Round Penetrant (Sleeved/Unsleeved) Rectangular Opening/Rectangular Penetrant/Round Penetrant/Combination Penetrants The Resulting Annular Space Between the Item and the Assembly that it Passes Through
63 D. The Required Rating of the Firestop System Determined by the Rating of the Penetrated Assembly: F Rating (Hours) T Rating (Hours) L Rating (CFM/SQ. FT)
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68 Questions & Answers
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