Risk Management Indoor Air Quality (IAQ) Tailoring Lease Specifications www.saif.com
This may be unfortunate because in many climates with low density occupancy, the use of heat recovery equipment can assist in guaranteeing both the adequate IAQ will be provided throughout the year and that energy costs will be minimized.
Preference in awarding lease agreements will go to proposals for space in buildings that have the capacity to vary the quantity of indoor air up to 100 percent of the total supply air. Further preference should go to buildings where life-cycle cost analyses, including energy, demonstrate the advantages of heat and/or moisture recovery ventilation systems.
An alternative approach would be to have the evaluation process for potential lease spaces to include a ranking where the ventilation system is given points according to its type. Under this scheme, the most points would go to buildings with 100 percent outside air capability and bonus points for heat and/or moisture recovery systems, if supported by life-cycle cost analyses. The least points would go to buildings with merely constant minimum OA systems. A possible rank ordering of the various options for providing outdoor air are presented in the following chart:
Buildings with full economizer capability (100 percent outdoor air) and heat and/or moisture recovery where economically justified by life-cycle analysis (including energy).
Buildings with constant volume or variable air volume HVAC systems with full economizer capability (100 percent outdoor air).
Buildings with constant volume or variable air volume HVAC systems with partial economizer capability (50 percent outdoor air).
Buildings with variable air volume HVAC systems with separate dedicated constant volume outdoor air fans to operate under minimum outdoor air conditions.
Buildings with variable air volume HVAC systems with the ability to proportional increase the amount of outdoor air entering as the total air volume decreases.
Buildings where the amount of outdoor air is limited to one constant minimum value.
Other possibilities for lease language include incorporation by reference to various standards. As an example for the State of Maine, an act to require state-leased buildings to meet certain air quality standards includes the following statements:
“Application of minimum air ventilation standards: Beginning September 1, 1988, to apply the ASHRAE Indoor Air Quality and Ventilation Standards by the American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc. or more
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