Stack loosely. The manual sets 15-20 cm between bags so heat escapes; tight stacks push centre bags over 30 C. Racks with a gap under each bag drain better than a floor pile.
NHB repeats the ICAR advice to screen doors and ventilators with nylon net of 35 mesh or finer so flies cannot lay eggs in the bags. Keep the room closed; the manual wants it pre-fumigated before spawning and a closed room stays that way.

