Specifications include, but are not limited to:Demo existing return air ducts from the roof top unit (RTU) above room 114 and 1MECH2. All return air ductwork between the RTU and the roof shall be removed. Contractor to cover roof penetrations with 18 gauge minimum galvanized sheet metal and seal it to prevent leaks using silicone caulk. 2.Demo existing RTU supply air ducts where they enter into rooms 112 and 114 (i.e., below the roof and before they enter these two rooms). The remaining supply duct from the RTU shall be connected to the new flex duct described in item 5 below. 3.Install a return air register in the corridor outside of room 118. Galvanized, 18 gauge, exterior insulated duct shall penetrate the roof and connect to the existing RTU above 114/1MECH2. All duct on roof and from the return air grill shall be internally insulated with 1” duct board insulation. Size of the duct shall be by the contractor and be of sufficient area to ensure optimum performance of the RTU. The roof does not have a warranty on it. Contractor is responsible for installing the new roof penetration in the corridor area. 4.Install insulated flex duct such as Atco Flex Duct, R-22, in the corridors shown in the attached sketch which include from 114 to 102, a branch from 108 to 122, and another branch from 103 to 116. Note a new wall will be installed by others between 103 and 122; new flex duct shall not extend west of this wall’s location. Duct shall be sized to ensure equitable air flow to all corridor areas. Install sufficient registers in the ceiling grid to control the temperature in the corridors. Registers shall have dampers to allow for air flow adjustment such as commercial grade Air Mate registers. New flex duct shall be supported from the roof structure per the manufacturer’s recommendations, not just resting on top of the ceiling tile/insulation. Location and quantity of registers shown in the sketch are diagrammatic; contractor is responsible for providing a sufficient amount to ensure good temperature control in the corridors. 5.Contractor responsible for removal and installation of all ceiling tile and insulation to complete the installations. Contractor is also responsible for damage to these items and the ceiling grid, unless it is identified PRIOR to beginning the work. 6.Contractor shall balance system to ensure even distribution of air to all corridor areas. 7.Thermostat to be located near room 120, but verify with Owner prior to its installation. ROOMS 120, 122 HVAC: 1. Install a new 3 ton Carrier (or equivalent), minimum of 13 SEER, HVAC split system with gas heat inside room 120. Condenser unit for the system shall be installed on the roof (roof penetrations and support of condenser on roof is by the contractor). 2. Owner will provide a new 3 phase, 208 volt disconnect on the west wall of room 120 for the contractor to use for powering the new HVAC unit
