Honeywell 621-3580 Description Description Honeywell 320 Point 24V DC Input Related products HONEYWELL STD924-A1A-00000-MB.3H+XXXX HONEYWELL 51304156-100 HONEYWELL 621-3550 HONEYWELL C7027A1031 HONEYWELL 620-3590 HONEYWELL 620-3691C