Home / Appliance / Parts / Furnace Pressure Switch 49L90 Furnace Pressure Switch 49L90$134.23 Price may not be up-to-date. In Stock View Product Part Number: 49L90 Brand: Lennox Seller: Repair Clinic Categories: Appliance, Parts 365-day return policy Description Part 49L90, Pressure Switch, is a genuine OEM part manufactured by Lennox. It is used in Lennox Furnaces. Find appliance parts, lawn & garden equipment parts, HVAC parts and more from the top brands in the industry. Related products Washer Spin Basket Assembly WH45X10112 Washer Outer Tub DC61-03557A Washer Spin Basket 137045000 P029 Cntrl & WH49X10083