Enhanced Cooling Efficiency The 57T01-843 blower delay timer optimizes the cooling of your air handling units by ensuring that residual air continues to circulate even after the compressor shuts down. 57T01-843 blower time delay for RLY02807, RLY02257, 91-9301, C800924P01, X13260259010, 57T01-001, 57T01-002, and D155079P01. precisions Delay Timing This unit features a precise startup delay of 2 seconds and a shutdown delay of 80 seconds, allowing for controlled airflows and abrupt temperature changes in your HVAC systems. Designed specifically for installation in air conditioning and heat pumps systems, the 57T01-843 compressor time delay is the perfect for managing airflows in compressor-operated environments. Package includes: 1Set 57T01-843 Blower Time Delay relays