Cooling/Heating: Total Capacity (BTU/hr) = 4.5 x CFM x (H ewb – H ₁wb) Sensible Capacity (Btu/hr) = 1.08 x CFM x (T 1 db – Tedb) Latent Capacity (Btu/hr) = 0.68 x CFM x (Grains H 2 O removed per lb. air) Sensible Heat Ratio = Sensible Heat / Total Heat. Lb per hr H 2 0 Removed = 4.5 x CFM x Grains H 2 0 removed per lb. air7000.