Green Klean Brand superior quality commercial vacuum filters are specifically designed for the Janitorial Professional vacuum cleaners and are backed by the Green Diamond Warranty. Green Klean® Windsor Sensor Replacement Exhaust Filter is made from the highest-quality materials to achieve filtration efficiencies up to 99.9%. Designed specifically for commercial use- equal to/exceeds OEM quality. Maintains suction longer than conventional bags: better suction, less vacuuming. Keeps machines running at peak performance. Removes many indoor allergens, especially in the critical 0.3 to 1 micron range. Fits XP12, XP15, SR12 SR15, SR18 uprights (50 filters per case), designed by Green Klean® for exact fit and performance as the OEM, at a considerable savings. Replaces OEM# 5143 & 8.614-145.0.