<prompt> At a PHC, vaccine storage is done inVaccine carrierILRWalk in Cold roomsCold box  <response>: - At PHC level vaccine is stored in small ILR small deep freezer ILR Cold chain components level in India STORAGE LEVEL STORAGE DEVICES DURATION OF STORAGE STATE REGIONAL LEVEL walk in cold rooms walk in freezer 3 months CHC DISTRICT LEVEL Large ILR Large deep freezer 1 month PHC Small ILR Small deep freezer 1 month SUBCENTER LEVEL Vaccine carriers 24-48hrs VILLAGE LEVEL Ice packs 2-4hrs 