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c. HVAC plenums and unit housings not pre-insulated at factory or lined. <br /> d. Exhaust and relief ductwork within 10 foot of wall or roof. <br /> e. Combustion and intake ductwork. <br /> f. Do not insulate return ductwork unless exposed to non-conditioned areas of the building. <br /> 2. Insulate each ductwork system specified above with one of the following types and thicknesses of insulation: <br /> a. Rigid Fiberglass: 1%Z"thick,increase thickness to 2"in machine,fan and equipment rooms. ' <br /> b. Flexible Fiberglass: 1%'thick,application limited to concealed locations. <br /> C. Hot Ductwork(Above Ambient Temperature): <br /> 1. Application Requirements: Insulate the following hot ductwork <br /> a. Range and hood exhaust ductwork <br /> b. Water heater flues. <br /> 2. Insulate each ductwork system specified above with one of the following types and thicknesses of insulation: <br /> a. Rigid Fber 2"thick <br /> b. Flexible Fberglass:2"thick,application limited to concealed locations. <br /> c. Calcium Silicate: 2"thick Use for range and hood exhaust ductwork,in addition to other applications , <br /> where indicated. <br /> D. Ductwork Exposed to Weather. Protect outdoor insulation from weather by installing sealed double-wall ductwork <br /> with insulation between walls. Provide epoxy mastic finish applied as recommended by manufacturer. <br /> 3.05 EQUIPMENT INSULATION <br /> A. Cold Equipment(Below Ambient Temperature): <br /> 1. Application Requirements: Insulate the following cold equipment: <br /> a. Refrigeration equipment,including tanks and pumps. <br /> b. Drip pans under chilled equipment. <br /> C. Water softeners. <br /> d Cold and chilled water pumps. <br /> e. Roof drain bodies. <br /> 2. Insulate each item of equipment specified above with one of the following types and thicknesses of insulation: i <br /> a. Fiberglass: 2"thick for surfaces 35°F and 3"thick for surfaces 35°F and lower. <br /> b. Cellular glass: 3"thick for surfaces above 35°F and 4%z"thick for surfaces 35°F and lower. 1 <br /> c. Flexible Cellular Elastomeric: 1"thick- <br /> B. <br /> hickB. Hot Equipment(Above Ambient Temperature): , <br /> 1. Application Requirements: Insulate the following hot equipment. <br /> a. Boilers(not pre-insulated at factory). <br /> b. Hot water storage tanks. <br /> c. Water heaters(not pre-insulated at factory). <br /> d. Heat exchangers. <br /> e. Hot water expansion tanks. <br /> f. Hot water pumps. <br /> g. Fuel oil heaters. ' <br /> i <br /> 15250-6 No.99132-CP2 <br />