I have 3 story office building with a separate roof top package -- DX cooling and hot water heat from DES system --in each office space. My cooling loads are reasonable, but I have no heat and very high fan loads. Obviously, the fans are providing all the heat. No DES heat is used except for SHW. I have checked the fan air volumes, and they are reasonable. I have set all fans to draw .9watt/cfm of air. I do not see the problem.
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