Economic factors are generally more accurately known than the other LCC factors. Economic factors include: present fuel costs for heating and cooling; fuel cost adjustments over the life of the facility; and incremental cost for EEMs, service life, and interest rates. The installed cost of EEMs should be estimated using costs from recent projects in the same region as the facility being designed and a contingency factor should be included to account for future expansion and cost overrun possibilities. Preliminary discussions with construction contractors and vendors should be completed and included in LCC data. [Lacey, 1993]
Complete, installed VAV systems for laboratories with chemical fume hoods can be as much as $5,000 per hood. When a simple Class 100,000 laboratory cleanroom system is used as a reference point, a sophisticated Class 10,000 cleanroom may cost five times as much, a unidirectional air-flow system for Class 100 may cost 20 to 30 times as much, and a unidirectional air-flow system for Class 1 may cost 30 to 50 times as much. [Saunders, 1993; Schicht, 1991]
