System Efficiency: Maintaining a clean ignition cycle helps preserve the unit’s original AFUE rating and sound quality

handling the complex algorithms that modulate RPM based on system demand to maintain peak efficiency

which may fail to keep the oil sufficiently warm in extreme cold

It is a direct fit for many Lochinvar Knight and A

this 100187874 replacement part eliminates common combustion issues such as resonant noise or inconsistent ignition

Lennox 93L84 Collector Box 320788-704 System Efficiency: Maintaining a cleanThe Lennox 93L84 Collector Box (also identified by part number LB 99004A) is a critical OEM replacement component designed for high efficiency condensing gas furnaces. As a veteran technician knows, the collector box is the central hub for managing corrosive condensate before it enters the drain trap. Over time, heat cycling and acidic residue can lead to stress cracks or seal failure in the composite housing, causing pressure switch trips or water