The Tjernlund V2D UnderAire Crawl Space Ventilator is a high-capacity mechanical ventilation solution engineered to mitigate crawl space moisture and improve structural integrity

providing robust switching for refrigeration compressors

preventing heat exchanger damage and ensuring system safety

mitigating mineral buildup and ensuring consistent lift

Does the wiring harness need to be used

Siemens Combustion LAL2.25-110V Control 328140-751 The Tjernlund V2D UnderAire CrawlThe Siemens Combustion LAL2. 25 110V Control is a specialized oil burner controller engineered for the supervision and sequencing of oil atomizing burners of medium to high capacity. This unit is specifically designed for 110V AC systems and is capable of managing multistage or modulating burners in intermittent operation. It provides mandatory air pressure supervision to ensure 100% verified air damper control, a critical safety protocol for