Typical Heights: average coil fin height 42″ Over 56″ tall hard to handle. Higher humidity climates can develop blowoff issues for taller coils (ie taller than 48″). Shorter than 32″ fin height, on stacked coils are typically better off with a single coil.
CC coils with latent loads typically sized ~ 500 fpm. ICC / HC coils with no latent loads can be sized for ~1000 fpm. Often the ICC or HC coils are forced to be sized similar to the CC coils for good air distribution across CC coils. At times coils (typically CC coils) are staggered due to airhandler face area constraints.
Airhandler Height = (Fin Height + 1.5″) * (Number Coils Tall) + .5″ * (1 – Number Coils Tall) + AH Base + AH Roof + AH Slope
Airhandler Width = Coil OAL + 2 * AH Wall Thickness
Coil OAL is distance from back edge of return bend to front edge of coil header. OAL is taken from coil selection or is typically Fin Length + 14″ on units where AH Wall Thickness is 8″.
For Staggered Coils with straight headers take overall width / 2 – 14″ for fin length. Add additional 8″ to Airhandler length for coil offsets.
For Staggered Coils with 90 deg headers, add about 6″ additional width for extra header width.
Coil Pull: Typically about 80% of coil length for standard pull. For more critical pull lengths, use staggered coils or coils pulled out through doors.
Drain Pan: Typically start at coil and continue 24″ downstream of coil leaving edge. Often about 1/3 height of coil fin height in dry climates and 1/4 height of coil fin height in humid areas.