B. Flexible Mineral Fiber Blanket: 1. Adhere insulation to metal with 75 mm (3 inch) wide strips of insulation bonding adhesive at 200 mm (8 inches) on center all around duct. Additionally secure insulation to bottom of ducts exceeding 600 mm (24 inches) in width with pins welded or adhered on 450 mm (18 inch) centers. Secure washers on pins. Butt insulation edges and seal joints with laps and butt strips. Staples may be used to assist in securing insulation. Seal all vapor retarder penetrations with mastic. Sagging duct insulation will not be acceptable. Install firestop duct insulation where required. 2. Supply air ductwork to be insulated includes main and branch ducts from AHU discharge to room supply outlets, and the bodies of ceiling outlets to prevent condensation. Insulate sound attenuator units, coil casings and damper frames. To prevent condensation insulate trapeze type supports and angle iron hangers for flat oval ducts that are in direct contact with metal duct. 3. Concealed supply air ductwork. a. Above ceilings at a roof level, in attics, and duct work exposed to outdoor weather: 50 mm (2 inch) thick insulation faced with FSK. b. Above ceilings for other than roof level: 40 mm (1 ½ inch) thick insulation faced with FSK. 4. Concealed return air duct: a. //In attics (where not subject to damage) and where exposed to outdoor weather: 50mmm (2 inch)thick insulation faced with FSK, // b. Above ceilings at a roof level, unconditioned areas, and in chases with external wall or containing steam piping; 40 mm inch) thick, insulation faced with FSK. //c. In interstitial spaces (where not subject to damage): 40 mm inch thick insulation faced with FSK. // d. Concealed return air ductwork in other locations need not be insulated. 5. Concealed outside air duct: 40 mm (1-1/2 inch) thick insulation faced with FSK. 6. Exhaust air branch duct from autopsy refrigerator to main duct: 40 mm (1-1/2 inch) thick insulation faced with FSK. C. Molded Mineral Fiber Pipe and Tubing Covering:
B. Flexible Mineral Fiber Blanket: 1. Adhere insulation to metal with 75 mm (3 inch) wide strips of insulation bonding adhesive at 200 mm (8 inches) on center all around duct. Additionally secure insulation to bottom of ducts exceeding 600 mm (24 inches) in width with pins welded or adhered on 450 mm (18 inch) centers. Secure washers on pins. Butt insulation edges and seal joints with laps and butt strips. Staples may be used to assist in securing insulation. Seal all vapor retarder penetrations with mastic. Sagging duct insulation will not be acceptable. Install firestop duct insulation where required. 2. Supply air ductwork to be insulated includes main and branch ducts from AHU discharge to room supply outlets, and the bodies of ceiling outlets to prevent condensation. Insulate sound attenuator units, coil casings and damper frames. To prevent condensation insulate trapeze type supports and angle iron hangers for flat oval ducts that are in direct contact with metal duct. 3. Concealed supply air ductwork. a. Above ceilings at a roof level, in attics, and duct work exposed to outdoor weather: 50 mm (2 inch) thick insulation faced with FSK. b. Above ceilings for other than roof level: 40 mm (1 ½ inch) thick insulation faced with FSK. 4. Concealed return air duct: a. //In attics (where not subject to damage) and where exposed to outdoor weather: 50mmm (2 inch)thick insulation faced with FSK, // b. Above ceilings at a roof level, unconditioned areas, and in chases with external wall or containing steam piping; 40 mm inch) thick, insulation faced with FSK. //c. In interstitial spaces (where not subject to damage): 40 mm inch thick insulation faced with FSK. // d. Concealed return air ductwork in other locations need not be insulated. 5. Concealed outside air duct: 40 mm (1-1/2 inch) thick insulation faced with FSK. 6. Exhaust air branch duct from autopsy refrigerator to main duct: 40 mm (1-1/2 inch) thick insulation faced with FSK. C. Molded Mineral Fiber Pipe and Tubing Covering:
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