Question: how to calculate insulation thickness for ducts?
Answer: General Formula to Calculate Minimum Insulation Thickness Required to Prevent Condensation,t= k * R{(T1 - T2)/ (T3 - T1)} ,
Where,
t = Insulation thickness (in)
k = Thermal conductivity.
R = Surface temperature resistance.
T1 = Dew point temperature (°F)
T2 = Operating temperature (°F)