Brand new old stock OEM Bis Fireplace Fan UZY7B26ZY UZY. Dual Metal Housing OEM Fan kit with Wire Harnesses, Screws and Aluminum tape for BIS 1.0 & 1.2. This is an OEM Bis blower motor replacement for the Security Bis 1 & Bis 2 wood fireplaces. These blowers measure 4 3/4? W x 4 3/4? L x 1 3/4? D.