Document Gk8KjYYv8rRzEJZDL8dO4E3n

MINUTES OF THE DUCT SYSTEMS COMMITTEE MEETING NATIONAL INSULATION MANUFACTURERS ASSOCIATION Chicago, 111 February 28, 1967 The meeting was called, to order at 9*00 A.M. with the following in attendance: C. E. Ernst A. Farr G. K. Hammond J. Hemlick W. T. Irwin J. E. Johnson L. Lach R. E. Naylor A. C. Pecora W. Silk H. Smith J. Thiry J. M. Barnhart Johns -Manville Owens-Corning Owens-Coming Johns-Manville PPG Industries Gustin-Bacoa Johns -Manville Johns-Manville PPG Industries Johns-Manville Johns-Manville Gustin-Bacon NIMA U. L. PROPOSAL G. K. Hammond, J. E. Johnson, R. E. Naylor, A. C. Pecora, and J. M. Barnhart met with J. Bono and R. Zelinski to discuss the U. L. Proposal. It was agreed that the proposal was worthwhile and the contract was signed and U. L. is to proceed. The cost is not to exceed $7,000 for Phase I. PROPOSED REVISIONS TO NFPA 9QA The initial draft was discussed and several changes made. The revised draft will be shown to R. Stevens of NFPA for advice. AIR EROSION TESTS It was reported that the testing was on schedule and will be completed by April 1, 19o7. GSA SPECIFICATION It was agreed that the rewrite of GSA Standard Air Conditioning Specification (Par.IU8-I56, re: Fibrous Glass Ductwork) would be dene by the Committee. J. Thiry is to provide the Committee with a rough draft prior to March 20, 1$67. 2- FHA - MPS NO. 31 C. E. Ernst's draft of February 27, 1967, was discussed in detail and the fol lowing agreed upon: (J. Johnson to verify and let J. M. Barnhart know of any changes he was desirous of making.) Par, 1003-14.Ih Supply and return air ducts used for heating and/or cooling shall be insulated with (1) flexible blanket insulation conforming to HH-I-558 Type Class, or (2) rigid board insulation conforming to HH-I-558 Type Class; or thermally equivalent duct complying with UL l8l, (1) In attics, garages, ventilated crawl spaces, and portions of ducts facing or abutting such areas: a. Flexible blanket insulation shall be 2" thick and shall be applied so that the average installed thickness shall not be less than 1 1/4" on round ducts, and not less than. 1 1/2" between corners as applied on rectangular ducts. b. Rigid board insulation shall be 1" thick. c. Duct system material complying with U.L. l8l shall be thermally equivalent to par. (a) or (b). (2) In crawl spaces with tightly closing ventilating louvres: a. Flexible blanket insulation shall be 1" thick and shall be applied so that the average applied thickness shall not be less than 3/4". b. Rigid board insulation shall be l/2" thick. c. Duct system material complying with U.L. 181 shall be thermally equivalent to par. (a) or (b). (3) When used for cooling, insulated ducts or their thermal equivalent shall be covered with a vapor barrier facing and all joints shall be sealed to limit vapor penetration. a. Vapor barriers shall have a maximum permeability of 0.5 perm (ASTM E 96 - Procedure A). b. Vapor barriers on separately insulated ducts shall have a minimum puncture resistance of 15 Beach units. Thermally equivalent ducts with barrier facings shall meet the requirements for puncture resistance and air leakage of UL Standard 181. Fugitive moisture-sensi tive or corrosive treatments shall not be used to impart flame resistance. -3- (l*) a. Duct insulation and covering shall have a composite flame spread classification not to exceed 25 and smoke developed rating not to exceed 50, when tested in conformance with UL Standard 723, and be so labeled as required by UL, Inc. b. Thermally equivalent ducts and covering shall have a composite flame spread classification not to exceed 25 and smoke developed rating not to exceed 50, meet all other requirements of UL Standard l8l for Class I Air Ducts, and be so labled as required by UL, Inc. The above will be sent to C. Droba of FHA. REINFORCEMENT TESTS The technical section discussed this subject and agreed to the following design values: SD - 1.3 in. lb. HD - 2.6 in. lb. C. E. Ernst is to contact F, Wilson relative to having Ohio State University develop a series of curves including 3*0 in. lb. bending moment and a series of stiffness factors for reinforcement sections. ROUGHNESS COEFFICIENTS The curves are still in development. They are scheduled to be completed by the next Committee Meeting. OTHER 3USINESS It was agreed that the next Committee Meeting would be held March 29, 1967, in New York, N. Y. ADJOURNMENT There being no further business, the meeting was adjourned. Respectfully submitted J. M. Barnhart