DECEMBER JLC 1998 Test Results Questioned To the Editor: The article titled "Fiberglass Batts Pass Air Leakage Tests" (Notebook, 9/98) sounded more like a press release than a report on research. First, it appears that the fiberglass batts only "passed" with the help of an air-sealing package, but it's not clear whether the cost figures presented in the article include the air sealing or not. It is unfortunate that NAHB did not also study high-density cellulose, a technique with significant air-sealing benefits that is starting to be used in retrofits and is possible in new construction as well. Dave Brook Extension Energy Agent Oregon State University Portland, Ore. According to Mark Nowak of the NAHB Research Center, the total cost of the fiberglass installation