![]() ![]() ![]() for each airstream,” which is intended to encourage designers to size energy recovery devices with low enough face velocities to provide high energy recovery effectiveness and low air pressure drop. The fan power allowance for energy recovery devices was changed to be “(2.2 x energy recovery effectiveness) – 0.5 in. ![]() These allowances tend to allow inpatient healthcare facilities approximately 2.2 bhp per 1,000 cfm of supply air. ![]() The basic requirement for variable air volume (VAV) systems is that they should not require more than 1.3 bhp per 1,000 cfm of supply air, plus allowances for features such as fully ducted return and exhaust systems, filters with a MERV rating of more than 8, and energy recovery devices. The fan power requirements of 90.1-20 are similar, but there are a few differences. Conforming to the fan power limits has been difficult in some building types.
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