Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT15891 – Metal Ductwork & AccessoriesIssue Date:September 28, 2012Page #:17 of 195. Install flexible ducts as directly as possible without unnecessary loops andbends.6. Attach flexible duct to metal duct and end terminals with drawbands. Forinsulated type flexible ducts, install drawbands on both the inner sleeveand the outer jacket.C. Install insulated type flexible ducts on all air conditioning air handling unit supplyair systems. Install noninsulated type flexible ducts on all H & V (non airconditioned) air handling unit systems (supply and return air); and on all airconditioning air handling unit return air systems.3.4 EQUIPMENT CONNECTIONSA. General: Connect metal ductwork to equipment as indicated. Provide flexibleconnection for each ductwork connection to equipment mounted on vibrationisolators and/or equipment containing rotating machinery. Provide access doorsas indicated.3.5 INSTALLATION OF DUCTWORK ACCESSORIESA. Install ductwork accessories in accordance with manufacturer's installationinstructions, with applicable portions of details of construction as shown inSMACNA standards, and in accordance with recognized industry practices toensure that products serve intended function.B. Install turning vanes in square or rectangular 90° elbows in supply and exhaust airsystems, and elsewhere as indicated.C. Install access doors with latches operable from either side, except outside onlywhere duct is too small for person to enter. Install access doors at all firedampers, smoke dampers, motor operated dampers, humidifiers, reheat coils andsimilar devices requiring access. Install access doors every 20' on return andexhaust air systems. Label access doors in accordance with Division 15 Section“MECHANICAL IDENTIFICATION.”D. Install all components provided by other trades for installation in metal ducts(temperature sensors, pressure sensors, smoke detectors, etc.).METAL DUCTWORK AND ACCESSORIES 15891 17