An exterior wall assembly for an air handling unit enclosure features an outer layer of sheetmetal paneling with airtight sealed seams. The assembly is backed by a two-inch sheet metal liner and a twenty gauge perforated skin. Fastening is accomplished using number ten Tek screws spaced eighteen inches on center horizontally and twelve inches on center vertically.
#10 TEK SCREWS 18" ON CENTER HORIZONTAL 12" ON CENTER VERTICAL 20 GA. PERFORATED SKIN SEAL SEAMS AIRTIGHT SHEETMETAL PANELLING 2" SHEET METAL LINER 18"
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