If specifications state “connect diffusers with a 6 Ft. maximum length of flexible duct with clamps”. The plans show a diffuser where 5 Ft. of flexible duct will be used. This is?

If specifications state “connect diffusers with a 6 Ft. maximum length of flexible duct with clamps”. The plans show a diffuser where 5 Ft. of flexible duct will be used. This is?