Lincoln Service Parts 1 › Lincoln Electric 9SM21321-4 AIR CLEANER & BRACKET ASBLY M21321-4 Lincoln Electric 9SM21321-4 AIR CLEANER & BRACKET ASBLY M21321-4 Sale Price: $766.54 Original Price: $881.52 AIR CLEANER & BRACKET ASBLY PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! AIR CLEANER & BRACKET ASBLY PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1